JP2020184139A - Pressure reducing valve and pressure reducing valve unit - Google Patents

Abstract

An object of the present invention is to provide a pressure reducing valve in which parts such as a diaphragm can be easily replaced while installed in the middle of piping. A pressure reducing valve 2 includes an inflow pipe 11, an outflow pipe 12, an internal flow path 54 connecting the inflow pipe 11 and the outflow pipe 12, and a first valve seat 59 disposed in the internal flow path 54. , a first valve body 81 located downstream of the first valve seat 59, a diaphragm 73 that constitutes a part of the wall surface of the internal flow path 54, and a first valve body 81 that is located downstream of the first valve seat 59, and a diaphragm 73 that forms a part of the wall surface of the internal flow path 54; It has a valve body moving mechanism 83 that moves the valve body in a direction toward and away from the valve seat 59. The outflow pipe 12 includes a valve chamber 91 in the middle of the flow direction. The valve chamber 91 includes a second valve seat 115 , a second valve body 116 located downstream of the second valve seat 115 , and a biasing member 118 that biases the second valve body 116 toward the second valve seat 115 . A check valve unit 92 is housed therein. [Selection diagram] Figure 2

Description

The present invention relates to a pressure reducing valve installed in the middle of piping. Further, the present invention relates to a pressure reducing valve unit including such a pressure reducing valve.

In a high-rise hotel, the water supply system that supplies water to the water supply of each guest room includes a main that delivers water to each floor, and a plurality of branch pipes that branch from the main to each guest room on each floor. In such a water supply system, when trying to secure the water pressure in the water supply of each guest room on the top floor, the water pressure becomes too high in the water supply of each guest room on the lower floor. Therefore, a pressure reducing valve is installed in the middle of each branch pipe on each floor as needed to adjust the water pressure of the tap water in each guest room to a predetermined pressure. Patent Document 1 describes a pressure reducing valve used in such a case.

The pressure reducing valve of Patent Document 1 has a housing including an inflow pipe, an outflow pipe coaxial with the inflow pipe, and an internal flow path connecting the inflow pipe and the outflow pipe. A valve seat is provided in the middle of the internal flow path. Further, the pressure reducing valve includes a diaphragm that is displaced according to the pressure on the downstream side of the valve seat in the internal flow path, and a valve body that is fixed to the diaphragm via the output shaft. The valve body moves in the direction of approaching and away from the valve seat as the diaphragm is displaced, and changes the distance from the valve seat. As a result, the pressure reducing valve adjusts the pressure of the fluid passing through the pressure reducing valve to a predetermined pressure.

Japanese Unexamined Patent Publication No. 2005-314982

The diaphragm of the pressure reducing valve is displaced each time the water supply in the cabin is used. Therefore, the diaphragm is frequently loaded. Therefore, the pressure reducing valve may fail due to damage to the diaphragm.

Here, if the water stop valve arranged upstream of the pressure reducing valve is operated to stop the water in the branch pipe in the water supply system, the pressure reducing valve can be disassembled without being removed from the branch pipe and parts such as a diaphragm can be replaced. However, in this case, water downstream of the pressure reducing valve in the branch pipe flows back and leaks from the pressure reducing valve in the decomposed state. Therefore, there is a problem that it is not easy to replace parts such as a diaphragm.

In view of these points, an object of the present invention is to provide a pressure reducing valve in which parts such as a diaphragm can be easily replaced while being installed in the middle of a pipe. Another object of the present invention is to provide a pressure reducing valve unit including such a pressure reducing valve.

In order to solve the above problems, the pressure reducing valve of the present invention includes an inflow pipe, an outflow pipe, an internal flow path connecting the inflow pipe and the outflow pipe, and a first valve arranged in the internal flow path. A part of the wall surface of the seat, the first valve body located downstream of the first valve seat of the internal flow path, and the downstream side flow path portion located downstream of the first valve seat in the internal flow path. The outflow pipe has a diaphragm constituting the above and a valve body moving mechanism for moving the first valve body in a direction approaching and separating from the first valve seat according to the displacement of the diaphragm. A valve chamber is provided in the middle of the pipe axis direction, and the valve chamber includes a second valve seat, a second valve body located downstream of the second valve seat, and the second valve body as the second valve seat. The urging member and the urging member are housed, and the second valve body resists the water stop position that contacts the second valve seat and closes the outflow pipe and the urging force of the urging member. It is characterized in that it moves downstream from the second valve seat and between the water passage position where the outflow pipe is released.

According to the present invention, a valve chamber is provided in the outflow pipe of the pressure reducing valve. Further, a second valve seat, a second valve body located downstream of the second valve seat, and an urging member for urging the second valve body to the second valve seat are housed in the valve chamber. The second valve body releases the outflow pipe at a water stop position that contacts the second valve seat and closes the outflow pipe, and is separated downstream from the second valve seat against the urging force of the urging member. Move to and from the water flow position. That is, the pressure reducing valve is provided with a check valve mechanism that prevents the backflow of fluid in the middle of the outflow pipe. Therefore, when the pipe is stopped on the upstream side of the pressure reducing valve and the pressure reducing valve is disassembled without removing it from the pipe, the fluid downstream of the pressure reducing valve flows back to the internal flow path side in the pipe. It can be prevented or suppressed. As a result, it is possible to prevent or suppress the backflow fluid from leaking from the pressure reducing valve in the decomposed state, so that parts such as the diaphragm can be easily replaced.

The present invention includes a housing body having an inflow passage communicating with the inflow pipe, an outflow passage communicating with the outflow pipe, a cavity communicating with the inflow passage and the outflow passage, and an opening communicating with the cavity portion. It has a housing member, the first valve seat, the first valve body, the diaphragm, and a pressure reducing valve main body including the valve body moving mechanism, and the pressure reducing valve main body has the opening closed. It can be detachably attached to the housing body to partition the internal flow path together with the housing member. In this way, when the diaphragm, the first valve seat, or the first valve body is damaged, the pressure reducing valve main body is removed from the housing member and a new pressure reducing valve main body is attached to the housing main body. 1 The valve seat and the first valve body can be replaced with undamaged ones. Therefore, the pressure reducing valve can replace the diaphragm, the first valve seat, and the first valve body without removing the housing member from the pipe. Here, the pressure reducing valve is provided with a check valve mechanism downstream of the outflow path of the housing member. Therefore, when the pressure reducing valve main body is removed from the housing member, it is possible to prevent or suppress the backflow fluid from overflowing from the opening of the housing member. Therefore, it becomes easier to replace parts such as the diaphragm.

In the present invention, the outflow pipe includes an upstream outflow pipe integrated with the housing member, a downstream outflow pipe arranged downstream of the upstream outflow pipe, and the upstream outflow pipe and the downstream outflow pipe. It is desirable that the valve chamber is partitioned by the downstream side outflow pipe and the downstream side outflow pipe, which comprises a connecting member for connecting the two. In this way, the connection between the downstream outflow pipe and the upstream outflow pipe can be released by operating the connecting member, and the valve chamber can be opened. Therefore, it is easy to form a check valve mechanism by accommodating the second valve seat, the second valve body, and the urging member in the valve chamber provided in the middle of the outflow pipe.

In the present invention, the housing main body may be provided with a fixing portion for fixing the housing member at a portion opposite to the opening with the cavity portion sandwiched between them. In this way, the pipe can be connected to the pressure reducing valve in a state where the pressure reducing valve is fixed to the wall surface of the building or the like by using the fixed portion. Here, if the housing member is fixed to the wall surface of the building by the fixing portion, the pipe connected to the pressure reducing valve when the pressure reducing valve main body is removed from the housing member and when the pressure reducing valve main body is attached to the housing member. It is possible to prevent or suppress the load on the housing. As a result, the work of removing the pressure reducing valve main body from the housing member becomes easy, so that the replacement of parts such as the diaphragm becomes easier.

Next, the pressure reducing valve unit of the present invention has the above pressure reducing valve and a pressure reducing valve installation member for installing the pressure reducing valve, and the pressure reducing valve installation member includes an installation portion provided with an installation surface. A pressure reducing valve mounting portion extending from the side opposite to the installation surface of the installation portion in a direction perpendicular to the installation surface is provided, the inflow pipe and the outflow pipe are coaxial, and the fixed portion is depressurized. When fixed to the valve mounting portion, the inflow pipe and the outflow pipe extend along the pressure reducing valve mounting portion, and the outflow pipe is located closer to the installation portion than the inflow pipe and the opening. Is characterized in that it faces the side opposite to the pressure reducing valve mounting portion in a direction orthogonal to the pipe axis of the inflow pipe and the outflow pipe.

According to the present invention, if the installation portion of the pressure reducing valve installation member is installed on the floor surface of the building, the pressure reducing valve fixed to the pressure reducing valve mounting portion can be connected in the middle of the pipe extending in the vertical direction. Further, when the pressure reducing valve is fixed to the pressure reducing valve installation member, the opening of the housing member faces the side opposite to the pressure reducing valve mounting portion. Therefore, it is possible to prevent or suppress the load on the piping connected to the pressure reducing valve when the pressure reducing valve main body is removed from the housing member and when the pressure reducing valve main body is attached to the housing member. This facilitates the work of removing the pressure reducing valve main body from the housing member. Further, when the installation portion of the pressure reducing valve installation member is fixed to the floor surface of the building, the outflow pipe of the pressure reducing valve provided with the check valve mechanism is located below the inflow pipe. Therefore, when the pressure reducing valve main body is removed from the housing member, it is possible to prevent or suppress the backflow fluid from overflowing from the opening of the housing member. Therefore, it becomes easier to replace parts such as the diaphragm.

The pressure reducing valve of the present invention is provided with a check valve mechanism in the middle of the outflow pipe. Therefore, when the pipe is stopped upstream from the pressure reducing valve and the pressure reducing valve is disassembled without removing it from the pipe, the fluid downstream from the pressure reducing valve is prevented from flowing back to the side of the internal flow path in the pipe. Alternatively, it can be suppressed. As a result, it is possible to prevent or suppress the backflow fluid from leaking from the pressure reducing valve in the decomposed state, so that parts such as the diaphragm can be easily replaced.

Further, the pressure reducing valve unit of the present invention can prevent or suppress a load on the piping connected to the pressure reducing valve when the pressure reducing valve main body is removed from the housing member and when the pressure reducing valve main body is attached to the housing member. .. This facilitates the work of removing the pressure reducing valve main body from the housing member. Further, when the installation portion of the pressure reducing valve installation member is fixed to the floor surface of the building, the outflow pipe of the pressure reducing valve provided with the check valve mechanism is located below the inflow pipe. Therefore, when the pressure reducing valve main body is removed from the housing member, it is possible to prevent or suppress the backflow fluid from overflowing from the opening of the housing member. Therefore, it becomes easier to replace parts such as the diaphragm.

It is a side view of the pressure reducing valve unit to which the water stop valve is connected. It is sectional drawing of the pressure reducing valve to which the water stop valve is connected. It is sectional drawing of the pressure reducing valve which removed the pressure reducing valve main body from a water stop valve and a housing member. It is an exploded perspective view of the check valve unit.

The pressure reducing valve according to the embodiment of the present invention will be described below with reference to the drawings.

(Pressure valve unit)
FIG. 1A is a side view of the pressure reducing valve unit to which the water stop valve is connected. FIG. 1B is a side view of the pressure reducing valve unit to which the water stop valve is connected when viewed from a direction orthogonal to FIG. 1A. FIG. 2 is a cross-sectional view of the water stopcock and the pressure reducing valve cut along the axial direction of the inflow pipe and the outflow pipe. As shown in FIG. 1, the pressure reducing valve unit 1 includes a pressure reducing valve 2 and a pressure reducing valve installation member 3 to which the pressure reducing valve 2 is fixed. A water stop valve 4 is connected to the pressure reducing valve 2. The water stop valve 4 is located upstream of the pressure reducing valve 2.

The pressure reducing valve unit 1 is used when the pressure reducing valve 2 is installed in the middle of the piping of the water supply system that supplies water (fluid) to the water supply of each guest room in a high-rise hotel. That is, the water supply system of a high-rise hotel includes a main pipe (not shown) for delivering water to each floor, and a plurality of branch pipes 6 branching from the main pipe and extending toward each guest room on each floor. In such a water supply system, when trying to secure the water pressure in the water supply of each guest room on the top floor, the water pressure becomes too high in the water supply of each guest room on the lower floor. Therefore, a pressure reducing valve 2 is installed in the middle of each branch pipe 6 on each floor as needed to adjust the water pressure of the tap water in each guest room to a predetermined pressure.

The pressure reducing valve 2 has an inflow pipe 11 and an outflow pipe 12 coaxial with the inflow pipe 11. Further, as shown in FIG. 1A, the pressure reducing valve 2 includes an inflow pipe 11 and a fixing portion 13 projecting in a direction orthogonal to the inflow pipe 11. In the pressure reducing valve 2, the housing body 31 located between the inflow pipe 11 and the outflow pipe 12 is provided with an inspection hole 37. The inspection hole 37 is closed by a plug 38 so as to be openable and closable.

The pressure reducing valve installation member 3 includes an installation portion 15 having an installation surface 15a, and a pressure reducing valve mounting portion 16 extending in a direction perpendicular to the installation surface 15a from the side opposite to the installation surface 15a of the installation unit 15. In the pressure reducing valve 2, the fixing portion 13 is fixed to the pressure reducing valve mounting portion 16 and is supported by the pressure reducing valve installation member 3. In a state where the fixing portion 13 is fixed to the pressure reducing valve mounting portion 16, the pressure reducing valve mounting portion 16 is located on one side of the pressure reducing valve 2 and the water stop valve 4. The inflow pipe 11 and the outflow pipe 12 extend along the pressure reducing valve mounting portion 16. The outflow pipe 12 is located closer to the installation portion 15 than the inflow pipe 11.

The upstream pipe 21 of the branch pipe 6 is connected to the inflow pipe 11 via the water stop valve 4. A downstream pipe 22 of the branch pipe 6 is connected to the outflow pipe 12. Therefore, in the pressure reducing valve 2, water flows in the flow direction from the inflow pipe 11 side toward the outflow pipe 12.

Here, the water stopcock 4 is a ball water stopcock. As shown in FIG. 2, the water stop valve 4 includes a ball valve body 25, a valve box 26, and a handle 27 for rotating the ball valve body 25. The ball valve body 25 is housed in a valve chamber 28 partitioned inside the valve box 26. The handle 27 includes a shaft portion 29 extending through the valve box 26, and a knob portion 30 connected to one end of the shaft portion 29 on the outside of the valve box 26. The other end of the shaft portion 29 is connected to the ball valve body 25 in the valve box 26. If the ball valve body 25 is rotated by operating the knob portion 30, the inflow of water from the upstream pipe 21 to the pressure reducing valve 2 can be stopped at the water stop valve 4.

In the following description, the three directions orthogonal to each other are the X direction, the Y direction, and the Z direction. The X direction is a direction along the pipe axis L of the inflow pipe 11 and the outflow pipe 12. The Y direction is the direction in which the pressure reducing valve 2 and the pressure reducing valve mounting portion 16 face each other. The Z direction is the width direction of the pressure reducing valve 2. Further, in the X direction, the side where the outflow pipe 12 is located is the −X direction, and the side where the inflow pipe 11 is located is the + X direction. In the Y direction, the side where the pressure reducing valve mounting portion 16 is located is in the −Y direction, and the side where the pressure reducing valve 2 is located is in the + Y direction.

(Pressure valve installation member)
As shown in FIG. 1, the installation portion 15 of the pressure reducing valve installation member 3 has a plate shape. The planar shape of the installation portion 15 is substantially square. The pressure reducing valve mounting portion 16 projects from the central portion of the pressure reducing valve installation member 3 in a direction orthogonal to the installation surface 15a. Notches 17 are provided on the edges of the four sides of the installation portion 15. When fixing the pressure reducing valve installation member 3 to the floor surface of each floor of a high-rise hotel, the installation surface 15a is brought into contact with the floor surface. Further, an anchor protruding from the floor surface of each floor is passed through the notch portion 17. Then, the installation portion 15 and the anchor are fastened by nuts, welding, or the like. When the pressure reducing valve installation member 3 is installed on the floor surface, the pressure reducing valve mounting portion 16 extends upward from the floor surface. Therefore, when the installation surface 15a of the installation unit 15 is installed on the floor surface, the X direction is the vertical direction. Further, when the installation surface 15a of the installation unit 15 is installed on the floor surface, the −X direction is downward and the + X direction is upward.

The pressure reducing valve mounting portion 16 has a first mounting plate portion 18 extending in a constant width in a direction perpendicular to the installation surface 15a, and a second mounting plate portion 18 extending in a constant width in a direction perpendicular to the installation surface 15a along the first mounting plate portion 18. A mounting plate portion 19 is provided. The end of the first mounting plate portion 18 on the side of the second mounting plate portion 19 and the end of the second mounting plate portion 19 on the side of the first mounting plate portion 18 are continuous, and the thickness of the first mounting plate portion 18 The direction and the thickness direction on the second mounting plate portion 19 side are orthogonal to each other. Therefore, the shape of the pressure reducing valve mounting portion 16 when viewed from the extending direction (X direction) of the valve pressure valve mounting portion is an L shape. The first mounting plate portion 18 is provided with two hole portions 20 at positions separated from each other in the extending direction L. Each of the holes 20 is an elongated hole extending in the X direction.

(Pressure reducing valve)
FIG. 3 is a cross-sectional view of the water stop valve 4 and the pressure reducing valve 2 with the pressure reducing valve main body removed. As shown in FIGS. 2 and 3, the pressure reducing valve 2 includes a housing member 32 including an inflow pipe 11, an outflow pipe 12, and a housing body 31. The housing member 32 is a cast product. Further, the pressure reducing valve 2 includes a pressure reducing valve main body 33 that is detachably attached to the housing member 32.

As shown in FIG. 3, the inflow pipe 11 is provided with a bag nut 35 on the outer peripheral side of the end portion in the + X direction. As shown in FIGS. 1 and 3, the outflow pipe 12 includes an octagonal outer peripheral surface portion 36 on the outer peripheral surface of the end portion in the −X direction. A water stopcock 4 is connected to the inflow pipe 11 by using a bag nut 35. A downstream pipe 22 is connected to the outflow pipe 12.

As shown in FIG. 3, the housing main body 31 has an inflow passage 41 communicating with the inflow pipe 11, an outflow passage 42 communicating with the outflow pipe 12, a cavity portion 43 communicating with the inflow passage 41 and the outflow passage 42, and a cavity portion. An opening 44 communicating with 43 is provided. The opening 44 has a tubular shape, and a female screw 45 is provided on the inner peripheral surface of the opening 44. The inspection hole 37 shown in FIG. 1A communicates with the outflow passage 43.

Further, the housing main body 31 is provided with a fixing portion 13 for fixing the housing member 32 at a portion opposite to the opening 44 with the cavity 43 sandwiched between them. The fixing portion 13 includes a leg portion 47 extending in the −Y direction from the housing body, a first fixing plate portion 48 extending in the −X direction from the tip portion of the leg portion 47, and a second fixing plate portion 49 extending in the + X direction. To be equipped. The thickness direction of the first fixing plate portion 48 and the second fixing plate portion 49 is directed to the Y direction. The first fixing plate portion 48 includes a first penetrating portion 50 for fastening bolts penetrating in the Y direction. The second fixing plate portion 49 includes a second penetrating portion 51 for fastening bolts penetrating in the Y direction.

As shown in FIG. 2, the pressure reducing valve main body 33 is mounted on the housing member 32 with the opening 44 closed. As a result, the pressure reducing valve main body 33 and the housing member 32 partition the internal flow path 54 that communicates the inflow pipe 11 and the outflow pipe 12. The internal flow path 54 passes through the inflow path 41, the cavity 43, and the outflow path 42.

As shown in FIG. 3, the pressure reducing valve main body 33 includes a cylindrical flow path component 55 that partitions the internal flow path 54 together with the housing member 32, and a metal cap that covers the flow path component 55 from the + Y direction. 56 and. The cap 56 is provided with a small diameter tubular portion 56a having a diameter smaller than that of the other portions at the end portion in the + Y direction. The small-diameter tubular portion 56a is covered with a cover 80 from the + Y direction. The flow path constituent member 55 includes a tubular member 57 extending in the Y direction and a flange member 58 fixed to the tubular member 57. The end of the tubular member 57 in the −Y direction is the first valve seat 59. The first valve seat 59 has an annular shape and faces the −Y direction.

The flange member 58 is an annular member having a through hole 61 extending in the Y direction at the center. The flange member 58 includes a small-diameter tubular portion 62 and a flange portion 63 of the small-diameter tubular portion 62 that extends outward in the + Y direction. A male screw 64 is provided on the outer peripheral surface of the small diameter tubular portion 62. The through hole 61 includes a small diameter hole portion 65 located on the inner peripheral side of the small diameter tubular portion 62, and a large diameter hole portion 66 on the inner peripheral side of the flange portion 63 having an inner diameter larger than that of the small diameter hole portion 65.

The flange member 58 is fixed to the tubular member 57 with the end portion of the tubular member 57 in the + Y direction inserted into the small-diameter tubular portion 62. In a state where the flange member 58 is fixed to the tubular member 57, the tubular member 57 penetrates the small diameter hole portion 65, and the + Y direction end of the tubular member 57 is in the middle of the large diameter hole portion 66 in the Y direction. Located in. An O-ring 67 is interposed between the tubular member 57 and the small-diameter tubular portion 62.

The tubular member 57 is provided with first communication holes 71 extending in the Y direction on the outer peripheral side of the small diameter hole portion 65 at four locations in the circumferential direction. The + Y direction end of the first communication hole 71 communicates with the large diameter hole portion 66. The −Y direction end of the first communication hole 71 opens in the −Y direction at the −Y direction end portion of the tubular member 57. Further, the tubular member 57 is provided with second communication holes 72 extending in a direction orthogonal to the Y direction and communicating with the small diameter hole portion 65 at four locations in the circumferential direction. The outer peripheral end of the second communication hole 72 opens between the flange member 58 in the Y direction and the first valve seat 59 in a direction orthogonal to the Y direction. The opening on the outer peripheral side of the second communication hole 72 is covered from the outer peripheral side by a strainer 74 fixed to the tubular member 57.

The diaphragm 73 is fixed to the + Y direction end surface of the flow path constituent member 55, that is, the + Y direction annular end surface 58a of the flange member 58. As shown by the chain line in FIG. 1 (b), the diaphragm 73 is circular. The diaphragm 73 is arranged coaxially with the flange member 58, and covers the large-diameter hole portion 66 of the flange member 58 from the + Y direction. Further, as shown in FIG. 3, the outer peripheral edge of the diaphragm 73 is sandwiched between the flow path constituent member 55 (flange member 58) and the cap 56 from both sides in the Y direction. As a result, the outer peripheral edge of the diaphragm 73 cannot be displaced, and the central portion of the diaphragm 73 can be displaced in the Y direction.

The central portion of the diaphragm 73 is displaceably supported by a support mechanism 75 provided on the cap 56. The support mechanism 75 includes a circular plate member 76 fixed to the central portion of the diaphragm 73, a shaft member 77 extending from the plate member 76 in the Y direction, and an adjusting screw 78 that movably supports the shaft member 77 in the Y direction. , Equipped with. The adjusting screw 78 includes a male screw 78a at an end portion in the + Y direction. The male screw 78a is screwed into the female screw provided on the inner peripheral surface of the small diameter tubular portion 56a of the cap 56. Further, the support mechanism 75 includes a coil spring 79 arranged on the outer peripheral side of the shaft member 77 in the + Y direction of the plate member 76. The coil spring 79 is compressed between the plate member 76 and the adjusting screw 78, and exerts an urging force that urges the diaphragm 73 in the −Y direction.

Here, when the cover 80 is removed from the cap 56 and the adjusting screw 78 is rotated, the adjusting screw 78 moves in the Y direction along the axis of the small diameter tubular portion 56a. Therefore, the urging force of the coil spring 79 for urging the diaphragm 73 can be adjusted by the rotation of the adjusting screw 78.

Further, the pressure reducing valve main body 33 includes a first valve body 81 arranged on the side opposite to the diaphragm 73 of the first valve seat 59. The first valve body 81 is connected to the central portion of the diaphragm 73 by a stem 82 extending in the Y direction inside the flow path component 55. The stem 82 moves in the Y direction according to the displacement of the diaphragm 73. The support mechanism 75 and the stem 82 constitute a valve body moving mechanism 83 that moves the first valve body 81 in the direction of approaching and away from the first valve seat 59.

The stem 82 includes a disk portion 85 at a position adjacent to the diaphragm 73 in the −Y direction. In a state where water does not flow through the pressure reducing valve 2, the disk portion 85 is in contact with the upper end portion of the tubular member 57 due to the urging force of the coil spring 79. Further, the stem 82 is provided with a large diameter portion 86 having a larger outer diameter than the other portions at a portion located on the inner peripheral side of the tubular member 57 in the + Y direction with respect to the second communication hole 72. The large diameter portion 86 is provided with an annular groove 87 extending in the circumferential direction. An O-ring 88 is attached to the annular groove 87. The O-ring 88 is compressed in the radial direction between the inner peripheral surface of the tubular member 57 and the stem 82. As a result, the portion of the tubular member 57 in the + Y direction of the second communication hole 72 and the large diameter portion 86 of the stem 82 are liquid-tight.

As shown in FIG. 2, in the pressure reducing valve main body 33, the first valve seat 59 and the first valve body 81 are inserted into the housing member 32 through the opening 44. Then, the male screw 64 of the flow path constituent member 55 (cylindrical member 57) is screwed into the female screw 45 of the opening 44 of the housing member 32. As a result, the pressure reducing valve main body 33 is attached to the housing member 32 with the opening 44 closed.

When the pressure reducing valve main body 33 is attached to the housing member 32, the pressure reducing valve main body 33 partitions the internal flow path 54 together with the housing member 32. Further, the first valve seat 59 is arranged in the middle of the internal flow path 54. More specifically, the first valve seat 59 is arranged inside the housing member 32 at the boundary portion between the cavity portion 43 and the outflow passage 42. The first valve body 81 is located downstream of the first valve seat 59 of the internal flow path 54. Therefore, the first valve body 81 is located in the outflow passage 42. Then, in the tubular member 57, the side of the first valve seat 59 with respect to the large diameter portion 86 of the stem 82 communicates with the inflow path 41 through the second communication hole 72.

When the pressure reducing valve main body 33 is attached to the housing member 32, the diaphragm 73 constitutes a part of the wall surface of the downstream flow path portion located downstream of the first valve seat 59 in the internal flow path 54. That is, when the pressure reducing valve main body 33 is mounted on the housing member 32, the large-diameter hole portion 66 of the flow path constituent member 55 communicates with the outflow passage 42 through the first communication hole 71. Therefore, the diaphragm 73 that closes the large-diameter hole portion 66 from the + Y direction becomes a part of the wall surface of the downstream flow path portion.

(Check valve mechanism)
FIG. 4A is an exploded perspective view of the check valve unit when viewed from the −X direction. FIG. 4B is an exploded perspective view of the check valve unit when viewed from the + X direction. As shown in FIG. 3, the pressure reducing valve 2 includes a check valve mechanism 90 in the outflow pipe 12. As shown in FIG. 2, the check valve mechanism 90 includes a valve chamber 91 provided in the middle of the outflow pipe 12 in the X direction (pipe axis L direction) and a check valve unit 92 housed in the valve chamber 91. , Equipped with.

More specifically, the outflow pipe 12 includes an upstream outflow pipe 95 provided integrally with the housing member 32, a downstream outflow pipe 96 arranged downstream of the upstream outflow pipe 95, and an upstream outflow pipe 95. A bag nut 97 (connecting member) for connecting the downstream outflow pipe 96 in a communicating state is provided.

As shown in FIG. 3, the upstream outflow pipe 95 includes a pipe portion 99 extending in the X direction, an annular plate portion 100 extending in a direction orthogonal to the pipe axis L from the end portion of the pipe portion 99 in the −X direction, and an annular shape. An annular wall portion 101 extending in the −X direction from the outer peripheral edge of the plate portion 100 is provided. A male screw 102 is provided on the outer peripheral surface of the annular wall portion 101. The downstream outflow pipe 96 includes an insertion pipe portion 104 that is inserted inside the annular wall portion 101 at an end portion in the + X direction. The tip of the intubation tube portion 104 abuts on the outer peripheral edge of the annular plate portion 100. An annular groove 105 is provided on the outer peripheral surface of the intubation tube portion 104. An O-ring 106 is inserted into the annular groove 105. The O-ring 106 is compressed in the radial direction between the annular wall portion 101 and the insertion tube portion 104.

The downstream outflow pipe 96 includes an annular locking protrusion 107 on the outer peripheral surface portion adjacent to the insertion pipe portion 104 on the outer peripheral surface. Further, the downstream outflow pipe 96 includes an octagonal outer peripheral surface portion 36 at an end portion in the −X direction on the outer peripheral surface. Further, the downstream outflow pipe 96 has an annular inner peripheral side protrusion 109 projecting to the inner peripheral side between the locking protrusion 107 on the inner peripheral surface in the pipe axis L direction and the octagonal outer peripheral surface portion 36. To be equipped.

The bag nut 97 includes a nut portion 110 having a female screw screwed into the male screw 102 of the upstream outflow pipe 95, and an annular nut locking portion 111 protruding inward from the −X direction end of the nut portion 110. Be prepared.

In the downstream outflow pipe 96, the insertion pipe portion 104 is inserted into the annular wall portion 101 of the upstream side outflow pipe 95 and is arranged coaxially with the upstream side outflow pipe 95. In the bag nut 97, the nut portion 110 is screwed into the male screw 102 of the upstream side outflow pipe 95 in a state where the nut locking portion 111 is locked to the locking protrusion 107 of the downstream side outflow pipe 96. As a result, the upstream side outflow pipe 95 and the downstream side outflow pipe 96 are connected in a communicating state to form the outflow pipe 12. Further, when the outflow pipe 12 is configured, the valve chamber 91 is partitioned between the annular plate portion 100 and the inner peripheral side protrusion 109 in the X direction. When the upstream side outflow pipe 95 and the downstream side outflow pipe 96 are connected and the valve chamber 91 is formed in the middle of the outflow pipe 12, the check valve unit 92 causes the upstream side outflow pipe 95 and the downstream side outflow pipe 96. It is placed between and. As a result, the check valve unit 92 is housed in the valve chamber 91.

As shown in FIG. 4, the check valve unit 92 includes an annular second valve seat 115, a second valve body 116 located in the −X direction (downstream) of the second valve seat 115, and a second valve body 116. The adjusting screw member 117 is provided so as to be movable in the X direction, and the urging member 118 for urging the second valve body 116 to the second valve seat 115. The urging member 118 is a coil spring.

The second valve seat 115 includes a metal annular plate 121 whose thickness direction is oriented in the X direction, and a rubber member 122 that covers the annular plate 121 from one side, the other side, and the inner peripheral side in the X direction. The rubber member 122 is made of EPDM (ethylene propylene rubber). The second valve seat 115 is formed by insert molding in which an annular plate 121 is arranged in a mold and EPDM is injected. An annular locking groove 123 is provided on the annular end face of the second valve seat 115 in the −X direction. The locking groove 123 includes a first groove portion 123a extending in the X direction and a second groove portion 123b extending from the + X direction end of the first groove portion 123a to the outer peripheral side.

The second valve body 116 is made of resin. The second valve body 116 has a valve body portion 125 having a circular planar shape and a curved surface whose center protrudes in the + X direction, an inner cylinder portion 126 extending in the −X direction from the center portion of the valve body portion 125, and a valve body. An outer cylinder portion 127 extending from the portion 125 to the outer peripheral side of the inner cylinder portion 126 in the −X direction is provided. An end portion of the coil spring 79 in the + X direction is inserted between the inner cylinder portion 126 and the outer cylinder portion 127. The coil spring 79 surrounds the inner tubular portion 126.

The adjusting screw material 117 is made of resin. The adjusting screw member 117 is a circular annular portion 133 connecting the support shaft 131 extending in the X direction, the four guide shafts 132 surrounding the support shaft 131 from the outer peripheral side, and the + X direction ends of the four guide shafts 132. And a connecting portion 134 connecting the ends of the four guide shafts 132 in the −X direction and the ends of the support shafts 131 in the −X direction.

The four guide shafts 132 are arranged at equal intervals around the support shaft 131. The inner diameter of the central hole of the annular portion 133 is larger than the outer diameter of the valve body portion 125. The annular portion 133 includes a locking protrusion 135 that projects in the + X direction. The locking protrusion 135 includes an annular protrusion 135a extending in the X direction and a bent portion 135b extending outward from the tip end portion of the annular protrusion 135a. The connecting portion 134 is formed at the intersection of the circular annular portion 136 connecting the ends of the four guide shafts 132 in the −X direction, the cross-shaped rib 137 bridged inside the annular portion 136, and the rib 137. The spring adjusting screw 138 provided is provided. The support shaft 131 extends in the + X direction from the center of the spring adjusting screw 138.

The second valve body 116 is inserted inside the four guide shafts 132 through the central hole of the annular portion 133. At this time, the tip end side portion of the support shaft 131 is inserted into the inner cylinder portion 126 of the second valve body 116. The end of the coil spring 79 in the + X direction contacts the valve body 125 and the end in the −X direction contacts the spring adjusting screw 138 between the inner cylinder 126 and the outer cylinder 127. Further, the second valve seat 115 is fixed to the annular portion 133 of the adjusting screw member 117. That is, the locking protrusion 135 of the adjusting screw member 117 is inserted into the locking groove 123 of the second valve seat 115. Here, the inner diameter of the second valve seat 115 is smaller than the inner diameter of the annular portion 133 and smaller than the outer diameter of the valve body portion 125. Therefore, when the second valve seat 115 is fixed to the adjusting screw member 117, the second valve body 116 comes into contact with the second valve seat 115 and the coil spring 79 is in a compressed state. As a result, the second valve body 116 is pressed against the second valve seat 115 by the urging force of the coil spring 79. Here, when the water flowing through the check valve unit 92 hits the valve body 125, the valve body 125 moves in a direction away from the second valve seat 115 against the urging force of the coil spring 79. When the valve body 125 moves, the support shaft 131 and the guide shaft 132 guide the valve body 125.

In the state where the check valve unit 92 is housed in the valve chamber 91, the second valve seat 115 is -X to the annular plate portion 100 of the upstream side outflow pipe 95 inside the insertion pipe portion 104 of the downstream side outflow pipe 96. Contact from the direction.

(Operation of pressure reducing valve)
When the pressure reducing valve 2 is installed in the middle of the branch pipe 6 and the water stop valve 4 is released, water can flow through the water stop valve 4 and the pressure reducing valve 2. When water flows, the second valve body 116 of the check valve mechanism 90 separates from the second valve seat 115 due to the pressure of the flowing water and releases the outflow pipe 12. Here, the diaphragm 73 of the pressure reducing valve 2 is displaced according to the pressure of the water flowing through the pressure reducing valve 2. When the diaphragm 73 is displaced, the valve body moving mechanism 83 moves the first valve body 81 in the direction of approaching and away from the first valve seat 59 according to the displacement of the diaphragm 73. As a result, the pressure reducing valve 2 adjusts the water flowing through the pressure reducing valve 2 to a predetermined pressure.

(Replacement work of diaphragm etc.)
The diaphragm 73 of the pressure reducing valve 2 is displaced every time the water supply in the guest room is used. Therefore, the diaphragm 73 is frequently loaded. Therefore, the pressure reducing valve 2 may fail due to damage to the diaphragm 73.

In such a case, first, the water stop valve 4 is operated to stop the inflow of water from the upstream pipe 21 to the pressure reducing valve 2. Next, as shown in FIG. 3, the pressure reducing valve main body 33 is removed from the housing member 32. After that, a new pressure reducing valve main body 33 is attached to the housing member 32. As a result, the diaphragm 73 is replaced with an undamaged one. After that, the water stop valve 4 is operated to pass water through the branch pipe 6. After that, pressure adjustment work is performed to complete the replacement work of the diaphragm and the like.

In the pressure adjustment work, first, the water stop valve 4 is slowly operated to stop the inflow of water from the upstream pipe 21 to the pressure reducing valve 2. Then, the plug 38 is removed from 31 of the pressure reducing valve main body, and a pressure gauge (not shown) is attached to the inspection hole 37. Then, the cover 80 is removed from the cap 56.

Next, the water stop valve 4 is operated to pass water through the branch pipe 6. Then, while checking the value of the pressure gauge, the adjusting screw 78 is rotated to adjust the urging force of the coil spring 79 for urging the diaphragm 73. As a result, the pressure inside the pressure reducing valve 2 is set to the target pressure. After that, the faucet downstream of the pressure reducing valve 2, for example, the faucet of the water supply in the guest room is opened and closed a plurality of times, and a confirmation work is performed to confirm whether the value of the pressure gauge is stable at the target pressure. If the value of the pressure gauge is not stable at the target pressure, the adjustment work and the confirmation work are repeated until the value stabilizes.

When the value of the pressure gauge stabilizes at the target pressure, the water stop valve 4 is operated to stop the inflow of water from the upstream pipe 21 to the pressure reducing valve 2. Then, the pressure gauge is removed from 31 of the pressure reducing valve main body, and the inspection hole 37 is closed with the plug 38. After that, the water stop valve 4 is operated to pass water through the branch pipe 6. Also, confirm that the pressure reducing valve 2 has no abnormality such as water leakage. Then, the cover 80 is attached to the cap 56. As a result, the pressure adjustment work is completed.

The pressure adjusting work is also performed when a new pressure reducing valve 2 is installed in the middle of the branch pipe 6. Further, the pressure adjusting work is also an inspection work performed when inspecting the pressure reducing valve 2.

(Action effect)
In this example, the valve chamber 91 is provided in the outflow pipe 12 of the pressure reducing valve 2. Further, in the valve chamber 91, the second valve seat 115, the second valve body 116 located downstream of the second valve seat 115, and the second valve body 116 are urged to urge the second valve seat 115. The member 118 and the member 118 are housed in the second valve body 116, which is in contact with the second valve seat 115 to block the outflow pipe 12, and the second valve body 116 is second against the urging force of the urging member 118. It moves downstream from the valve seat 115 to the water flow position where the outflow pipe 12 is released. That is, the pressure reducing valve 2 includes a check valve mechanism 90 that prevents the backflow of water in the middle of the outflow pipe 12. Therefore, when the pressure reducing valve main body 33 is removed from the housing member 32 in the replacement work of the diaphragm or the like, it is possible to prevent or suppress the backflow of water downstream of the pressure reducing valve 2 to the side of the internal flow path 54 in the branch pipe 6. .. As a result, it is possible to prevent or suppress the backflow of water from leaking from the pressure reducing valve 2 in the decomposed state, so that parts such as the diaphragm 73 can be easily replaced.

Further, in this example, when the diaphragm 73, the first valve seat 59, or the first valve body 81 is damaged, the pressure reducing valve main body 33 is removed from the housing member 32 and a new pressure reducing valve main body 33 is attached to the housing member 32. By doing so, these parts can be replaced with undamaged ones. Therefore, the pressure reducing valve 2 can replace the diaphragm 73, the first valve seat 59, and the first valve body 81 without removing the housing member 32 from the branch pipe 6. Here, the pressure reducing valve 2 includes a check valve mechanism 90 downstream of the outflow passage 42 of the housing member 32. Therefore, when the pressure reducing valve main body 33 is removed from the housing member 32, the backflow water can be prevented or suppressed from overflowing from the opening 44 of the housing member 32. Therefore, it is easy to replace parts such as the diaphragm 73.

Further, in the pressure reducing valve unit 1 of this example, if the installation portion 15 of the pressure reducing valve installation member 3 is installed on the floor surface of the building, the pressure reducing valve 2 fixed to the pressure reducing valve mounting portion 16 extends in the vertical direction. You can connect in the middle of. Further, when the pressure reducing valve 2 is fixed to the pressure reducing valve installation member 3, the opening 44 of the housing member 32 faces the side opposite to the pressure reducing valve mounting portion 16. Therefore, it is possible to prevent or suppress the load on the branch pipe 6 connected to the pressure reducing valve 2 when the pressure reducing valve main body 33 is removed from the housing member 32 and when the pressure reducing valve main body 33 is attached to the housing member 32. Therefore, the work of removing the pressure reducing valve main body 33 from the housing member 32 is easy.

Further, when the installation portion 15 of the pressure reducing valve installation member 3 is fixed to the floor surface of the building, the outflow pipe 12 of the pressure reducing valve 2 provided with the check valve mechanism 90 is located below the inflow pipe 11. Therefore, when the pressure reducing valve main body 33 is removed from the housing member 32, the backflow water can be prevented or suppressed from overflowing from the opening 44 of the housing member 32. Therefore, it is easy to replace parts such as the diaphragm 73.

Here, in this example, since the pressure reducing valve 2 is provided with the check valve mechanism 90, the installation work thereof is easier than in the case where the pressure reducing valve 2 and the check valve are separately installed in the middle of the branch pipe 6. Is. Further, since the pressure reducing valve 2 is provided with the check valve mechanism 90, the cost of forming the branch pipe 6 can be suppressed as compared with the case where the pressure reducing valve 2 and the check valve are separated. Further, since the pressure reducing valve 2 is provided with the check valve mechanism 90, the installation space for the pressure reducing valve 2 and the check valve can be reduced as compared with the case where the pressure reducing valve 2 and the check valve are separately installed in the middle of the branch pipe 6.

Further, the outflow pipe 12 of the pressure reducing valve 2 includes an upstream outflow pipe 95 integrated with the housing member 32, a downstream outflow pipe 96 arranged downstream of the upstream outflow pipe 95, and an upstream outflow pipe 95 and a downstream side. The valve chamber 91 is partitioned by the downstream outflow pipe 96 and the downstream outflow pipe 96, which includes a bag nut 97 that connects the outflow pipe 96 in a communicating state. Therefore, the connection between the downstream outflow pipe 96 and the upstream outflow pipe 95 can be released by operating the bag nut 97, and the valve chamber 91 can be opened. Therefore, it is easy to accommodate the check valve unit 92 in the valve chamber 91 provided in the middle of the outflow pipe 12 to form the check valve mechanism 90.

(Other embodiments)
The pressure reducing valve 2 includes a fixing portion 13 for fixing the housing member 32 to a portion of the housing body 31 opposite to the opening 44 with the cavity 43 sandwiched between them. Therefore, the pressure reducing valve 2 may be fixed to the wall surface of the building or the like without using the pressure reducing valve installation member 3. Even in this case, it is possible to prevent or suppress the load on the piping connected to the pressure reducing valve 2 when the pressure reducing valve main body 33 is removed from the housing member 32 and when the pressure reducing valve main body 33 is attached to the housing member 32. As a result, the work of attaching and detaching the pressure reducing valve main body 33 to and from the housing member 32 becomes easy, so that parts such as the diaphragm 73 can be easily replaced.

The pressure reducing valve 2 does not have to include the fixing portion 13. Even in this case, the pressure reducing valve 2 includes a check valve mechanism 90 that prevents the backflow of the fluid in the middle of the outflow pipe 12. Therefore, when the pressure reducing valve main body 33 is removed from the housing member 32, it is possible to prevent or suppress the backflow of water downstream of the pressure reducing valve 2 to the side of the internal flow path 54 in the branch pipe 6. As a result, it is possible to prevent or suppress the backflow of water from leaking from the pressure reducing valve 2 in the decomposed state, so that parts such as the diaphragm 73 can be easily replaced.

1 ... Pressure reducing valve unit, 2 ... Pressure reducing valve, 3 ... Pressure reducing valve installation member, 4 ... Water stopcock, 6 ... Branch piping, 11 ... Inflow pipe, 12 ... Outflow pipe, 13 ... Fixed part, 15 ... Installation part, 15a ... installation surface, 16 ... pressure reducing valve mounting part, 17 ... notch part, 18 ... first mounting plate part, 19 ... second mounting plate part, 20 ... hole part, 21 ... upstream side piping, 22 ... downstream side piping, 25 ... ball valve body, 26 ... valve box, 27 ... handle, 28 ... valve chamber, 29 ... shaft part, 30 ... knob part, 31 ... housing body, 32 ... housing member, 33 ... pressure reducing valve body, 35 ... bag nut , 36 ... octagonal outer peripheral surface portion, 37 ... inspection hole, 38 ... plug, 41 ... inflow path, 42 ... outflow path, 43 ... cavity, 44 ... opening, 45 ... female screw, 47 ... leg portion, 48 ... 1st fixing plate portion, 49 ... 2nd fixing plate portion, 50 ... 1st penetrating portion for fastening bolts, 51 ... 2nd penetrating portion for fastening bolts, 54 ... internal flow path, 55 ... flow path component member, 56 ... Cap, 56a ... Small diameter cylinder part, 57 ... Cylindrical member, 58 ... Flange member, 58a ... Circular end face, 59 ... First valve seat, 61 ... Through hole, 62 ... Small diameter cylinder part, 63 ... Flange part, 65 ... Small diameter hole, 66 ... Large diameter hole, 67 ... O ring, 71 ... 1st communication hole, 72 ... 2nd communication hole, 73 ... Diaphragm, 74 ... Strener, 75 ... Support mechanism, 76 ... Plate member, 77 ... Shaft member, 78 ... Adjusting screw, 78a ... Male screw, 79 ... Coil spring, 80 ... Cover, 81 ... First valve body, 82 ... Stem, 83 ... Valve body moving mechanism, 85 ... Disk part, 86 ... Large diameter part, 87 ... annular groove, 88 ... O-ring, 90 ... check valve mechanism, 91 ... valve chamber, 92 ... check valve unit, 95 ... upstream outflow pipe, 96 ... downstream outflow pipe, 97 ... cap nut (connecting member) ), 99 ... Pipe part, 100 ... Ring plate part, 101 ... Ring wall part, 104 ... Insert pipe part, 105 ... Ring groove, 106 ... O ring, 107 ... Locking protrusion 135a ... Ring protrusion, 107b ... Bending Part, 109 ... Inner peripheral protrusion, 110 ... Nut part, 111 ... Nut locking part, 115 ... Second valve seat, 116 ... Second valve body, 117 ... Adjusting screw material, 118 ... Biasing member, 121 ... Annular plate, 122 ... rubber member, 123 ... locking groove, 123a ... first groove portion, 123b ... extending second groove portion, 125 ... valve body portion, 126 ... inner cylinder portion, 1
27 ... outer cylinder, 131 ... supporting shaft, 131 ... extending support shaft, 132 ... guide shaft, 133 ... annular portion, 134 ... connecting portion, 135 ... locking protrusion, 135a ... annular protrusion, 135b ... bent portion, 136 ... annular part, 137 ... rib, 138 ... spring adjusting screw

Claims (5)

Inflow pipe and
Outflow pipe and
An internal flow path connecting the inflow pipe and the outflow pipe,
The first valve seat arranged in the internal flow path and
A first valve body located downstream of the first valve seat in the internal flow path,
A diaphragm forming a part of a wall surface of a downstream flow path portion located downstream of the first valve seat in the internal flow path,
It has a valve body moving mechanism that moves the first valve body in a direction approaching and away from the first valve seat according to the displacement of the diaphragm.
The outflow pipe is provided with a valve chamber in the middle in the pipe axial direction.
The valve chamber houses a second valve seat, a second valve body located downstream of the second valve seat, and an urging member for urging the second valve body to the second valve seat. Being done
The second valve body is separated from the second valve seat downstream from the water stop position where it contacts the second valve seat and closes the outflow pipe, and against the urging force of the urging member. A pressure reducing valve characterized by moving between a water flow position that releases an outflow pipe. A housing member including an inflow passage communicating with the inflow pipe, an outflow passage communicating with the outflow pipe, a cavity communicating with the inflow passage and the outflow passage, and a housing body having an opening communicating with the cavity portion.
It has the first valve seat, the first valve body, the diaphragm, and a pressure reducing valve main body including the valve body moving mechanism.
The pressure reducing valve according to claim 1, wherein the pressure reducing valve main body is detachably attached to the housing main body in a state where the opening is closed to partition the internal flow path together with the housing member. The outflow pipe communicates the upstream side outflow pipe integrated with the housing member, the downstream side outflow pipe arranged downstream of the upstream side outflow pipe, and the upstream side outflow pipe and the downstream side outflow pipe. With a connecting member that connects in a state,
The pressure reducing valve according to claim 2, wherein the valve chamber is partitioned by the downstream side outflow pipe and the downstream side outflow pipe. The pressure reducing valve according to claim 2 or 3, wherein the housing main body is provided with a fixing portion for fixing the housing member at a portion opposite to the opening with the cavity portion sandwiched between them. .. The pressure reducing valve according to claim 4 and
It has a pressure reducing valve installation member for installing the pressure reducing valve, and has
The pressure reducing valve installation member includes an installation portion having an installation surface and a pressure reducing valve mounting portion extending in a direction perpendicular to the installation surface from the side of the installation portion opposite to the installation surface.
The inflow pipe and the outflow pipe are coaxial and
When the fixed portion is fixed to the pressure reducing valve mounting portion, the inflow pipe and the outflow pipe extend along the pressure reducing valve mounting portion, and the outflow pipe is closer to the installation portion than the inflow pipe. A pressure reducing valve located, wherein the opening faces in a direction orthogonal to the pipe axes of the inflow pipe and the outflow pipe, and faces the side opposite to the pressure reducing valve mounting portion.

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