KR101253666B1 - Fluid controlling valve - Google Patents

Abstract

The pressure regulating valve according to the present invention includes an inflow passage, a connection passage, a first orifice connecting the inflow passage and the connection passage, a connection chamber connected with the connection passage, an outlet passage, a second orifice connecting the connection chamber and the outlet passage, A valve body having an installation hole connected to the outlet passage, a first valve seat disposed in the connection passage, a second valve seat disposed in the outlet passage, and a passage for guiding fluid entering the connection passage to the connection chamber A sleeve movably installed inside the sleeve, a sleeve press spring providing an elastic force in a direction away from the first valve seat with respect to the sleeve, a diaphragm for applying external force in a direction close to the first valve seat with respect to the sleeve, and a second Stem against the stem, which is movably installed in the mounting hole so as to be close to the valve seat or away from the second valve seat. It includes a system pressure spring for providing a force. The flow control valve according to the present invention can dually adjust the flow rate of the fluid using the sleeve and the stem.

Description

Flow control valve {FLUID CONTROLLING VALVE}

The present invention relates to a flow control valve, and more particularly to a flow control valve that can increase the precision of the flow control and can stably adjust the flow rate of the fluid.

Valves are installed in piping lines to control the flow of various fluids. Types of valves include ball valves, globe valves, plug valves, gate valves, check valves, needle valves, and float valves.

The ball valve (Ball Valve) is a ball inserted through the inside of the cylinder of the valve, the ball is rotated by the operation of the handle consists of a structure for opening and closing the flow path. Globe valve is a valve in which the spindle operates up and down by the operation of the handle and the seat blocks the nozzle to block the flow path.

The plug valve is a cock shaped like a cock, and rotates the conical plug by 90 ° around the shaft to open and close the flow path. The gate valve is a valve in which a valve plate installed in the direction perpendicular to the flow path closes the seat and performs a linear motion according to the operation of the handle. In addition, the butterfly valve (Butterfly Valve) is the valve of the simplest structure that can open and close the flow path by rotating the waste on the disc, the flow rate can be adjusted.

Most of these various types of valves are controlled by the user's manual operation, but in systems that need to automatically adjust the amount of fluid supply such as hot water, such as an automatic control heating system, valves that can automatically adjust the opening amount are provided. Required. In the case of the automatic control heating system, a hot water control valve is installed in the hot water supply line to control the hot water supply, and the hot water control valve is coupled with an actuator for controlling the operation of the valve so that the opening amount can be automatically adjusted.

In the case of the automatic control heating system, in order to control the temperature of the room accurately and quickly, the flow rate of the hot water flowing into each room must be accurately controlled. This requires a valve that can precisely control the flow rate of the hot water. In addition to automatic controlled heating systems, valves capable of precisely controlling the flow rate of fluids are required for various fluid supply systems.

The present invention has been made in view of the above, and an object of the present invention is to provide a flow control valve capable of increasing the accuracy of flow control and stably adjusting the flow rate of the fluid.

Pressure control valve according to an embodiment of the present invention for achieving the above object, the inlet flow passage, the connection flow passage, the first orifice connecting the inflow passage and the connection passage, the connection chamber is connected to the connection passage, the outlet passage And a second orifice connecting the connection chamber and the outlet passage, a valve body having an installation hole connected to the outlet passage, a first valve seat disposed in the connection passage, and a second orifice provided in the outlet passage. A second valve seat disposed therein, a sleeve having a passage for guiding the fluid flowing into the connection channel to the connection chamber, the sleeve being movably installed in the valve body, and away from the first valve seat with respect to the sleeve; A spring for providing an elastic force to the sleeve, the sleeve being coupled to the sleeve and the pressure in the outlet flow path A diaphragm that is elastically deformed when greater than an elastic force and exerts an external force on the sleeve in a direction closer to the first valve seat, and moves to the installation hole so as to be closer to or away from the second valve seat And a stem, wherein the stem is possibly installed and one end protrudes out of the valve body, and a stem pressure spring for providing an elastic force against the stem.

The pressure regulating valve according to an embodiment of the present invention may further include a sleeve support bushing disposed between the connection passage and the connection chamber and in which the sleeve is movably inserted.

The pressure regulating valve according to the embodiment of the present invention includes a hollow guide plug in which the stem is movably inserted and has a male thread, and a hollow support in which the guide plug is movably coupled and coupled to the installation hole. A plug, a female thread corresponding to the male thread of the guide plug to be screwed to the guide plug, and rotatably disposed between the guide plug and the support plug to move the guide plug during rotation; It may further include a distance adjusting bushing.

The support plug may have a non-circular coupling hole, and the guide plug may have a non-circular coupling portion inserted into the coupling hole of the support plug to prevent rotational movement.

The pressure regulating valve according to an embodiment of the present invention is coupled with the distance adjusting bushing so as to rotate together with the distance adjusting bushing, and an indicator having a scale for indicating a rotation angle and a tool engaging portion to which a tool can be coupled. It may further include a ring.

Pressure control valve according to an embodiment of the present invention, having a plurality of holes for filtering foreign matter contained in the fluid flowing into the interior of the valve body through the inlet is disposed between the inlet flow path and the first orifice It may further comprise a strainer.

The valve body may include a boss disposed in the connection passage, and the first valve seat may be coupled to a coupling groove provided in the boss.

The flow control valve according to the present invention can dually adjust the flow rate of the fluid using the sleeve and the stem. Therefore, the flow volume of the fluid can be stably adjusted, and the precision of the flow rate regulation can be improved.

1 is a perspective view showing a flow control valve according to an embodiment of the present invention.
2 is a cross-sectional view showing a flow control valve according to an embodiment of the present invention.
3 is an exploded perspective view showing a flow control valve according to an embodiment of the present invention.
Figure 4 is an exploded perspective view showing a first flow control unit of the flow control valve according to an embodiment of the present invention.
5 is an exploded perspective view showing a second flow control unit of the flow control valve according to an embodiment of the present invention.
6 to 8 are for explaining the operation of the flow control valve according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described in detail with respect to the flow control valve according to an embodiment of the present invention.

In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of description. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. These terms are to be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the contents throughout the present specification.

As shown in Figures 1 to 3, the flow control valve 10 according to an embodiment of the present invention is a valve body 20, the inside of the valve body 20 is provided with a flow path through which fluid can flow It includes a first flow rate control unit 50 and the second flow rate control unit 63 for adjusting the flow rate of the fluid flowing through the. The first flow rate control unit 50 is automatically operated by the pressure of the fluid inside the valve body 20 and is installed in the valve body 20. The second flow control unit 63 is installed in the valve body 20 so that a portion thereof is exposed to the outside of the valve body 20 so that it can be operated by the actuator 5 coupled with the flow control valve 10.

The valve body 20 includes a lower housing 21 and an upper housing 22. The lower housing 21 includes an inlet part 24 provided with an inlet 24, a first housing coupling part 25 for coupling with the upper housing 22, and an installation part 26 having an installation hole 26a. Have Inside the lower housing 21, an inflow passage 27 connected to the inlet 24, a first orifice 28 connected to the inflow passage 27, and a connection passage 29 connected to the first orifice 28 are provided. Is prepared. The first housing coupling part 25 is provided with a groove 25a forming a lower portion of the connection chamber 47 that is connected to the connection passage 29. The fluid flowing along the inflow passage 27 is bent in the flow direction toward the connection passage 29 through the first orifice 28. On the other hand, the connection flow path 29, the connection chamber 47 and the second orifice 46 to be described later are arranged on the same line, the fluid introduced into the connection flow path 29 does not change the flow direction of the second orifice 46 Will flow until.

A strainer 30 is disposed between the inflow passage 27 and the first orifice 28. The strainer 30 has a plurality of holes 30a for filtering foreign matter contained in the fluid flowing into the valve body 20 through the inlet 24. The sieve 30 is inserted into the lower housing 21 through the installation hole 26a. The installation hole 26a is closed by the closing plug 31. The closing plug 31 is provided with a male thread 33 corresponding to the female thread 32 provided on the inner circumferential surface of the mounting portion 26 and an external mechanism such as a pressure gauge or a thermometer so as to be screwed to the mounting portion 26. It has a coupling hole 31a for engaging. The engagement hole 31a can be closed by a stopper when the external mechanism is not engaged.

As shown in FIG. 2, a boss portion 34 having a coupling groove 34a is provided inside the connection passage 29 of the lower housing 21, and the boss portion 34 has a first valve seat 35. ) Are combined. The first valve seat 35 is coupled to the boss portion 34 by a fixing member 36 fixed to the coupling groove 34a. The structure of the first valve seat 35 is not limited to the illustrated structure, and may be changed into various structures having an upper surface perpendicular to the flow direction of the fluid flowing along the connection flow path 29.

The first housing coupling part 25 of the lower housing 21 is provided with a first branch passage 37 connected to the groove 25a. The first branch passage 37 is connected to the second branch passage 48 of the upper housing 22 to be described later to guide the fluid in the outlet passage 45 provided in the upper housing 22 to the connection chamber 47. Play a role. The inlet 24 of the lower housing 21 is coupled to the pipe connecting member 38 and the connecting bushing 39 for connecting the pipes.

As shown in Fig. 2 and 3, the upper housing 22 is the outlet 41, the outlet 40 is provided, the second housing coupling portion 42 for coupling with the lower housing 21, the installation hole The attachment part 43 in which 43a was formed is provided, and the engagement hole 22a for engagement of external mechanisms, such as a pressure gauge and a thermometer. The engagement hole 22a may be closed with a plug or the like when the external mechanism is not engaged.

Inside the upper housing 22, an outlet 40, an outlet passage 45 connected to the outlet 40, and a second orifice 46 connected to the connection chamber 47 are provided. The second orifice 46 is connected to the outlet passage 45. The mounting portion 43 of the upper housing 22 is for coupling the second flow rate control unit 63, and an internal thread 44 is provided on the inner circumferential surface of the mounting portion 43. The second housing coupling part 42 of the upper housing 22 is provided with a groove 42a forming an upper portion of the connection chamber 47.

When the lower housing 21 and the upper housing 22 are coupled, the groove 25a of the first housing coupling portion 25 and the groove 42a of the second housing coupling portion 42 are connected to each other so that the connection chamber 47 is connected. ). The lower housing 21 and the upper housing 22 may be coupled through a coupling member such as a bolt. The connection chamber 47 is a space in which the diaphragm 55 of the first flow control unit 50 to be described later is installed, and is divided into an upper chamber 47a and a lower chamber 47b by the diaphragm 55.

The upper chamber 47a connects the connecting passage 29 and the second orifice 46 and the lower chamber 47b is connected to the first branch passage 37 and the outlet passage 45 of the lower housing 21. It is connected to the outlet passage 45 through the second branch passage 48 provided in the housing 22. A second valve seat 49 having a second orifice 46 is provided between the connection chamber 47 and the outlet passage 45.

As shown in Figures 2 to 4, the first flow rate control unit 50 is installed inside the valve body 20 is automatically operated by the pressure of the outflow passage 45 to the interior of the outflow passage 45 Prevent the pressure from rising above a certain pressure. The first flow regulating unit 50 has a sleeve 52 having a passage 51 for guiding the fluid flowing into the connecting flow passage 29 into the connecting chamber 47, and the first valve seat with respect to the sleeve 52. Sleeve pressing spring 53 for providing elastic force in a direction away from 35, sleeve support bushing 54, sleeve 52 coupled to the lower housing 21 to support the sleeve 52 to move up and down And a diaphragm 55 for applying an external force in a direction approaching the first valve seat 35.

The sleeve support bushing 54 has a male thread 57 corresponding to the female thread 56 provided on the inner surface of the lower housing 21 around the connecting passage 29 and screwed to the lower housing 21. The sleeve 52 is coupled to the inside of the sleeve support bushing 54 so as to be movable up and down. An o-ring 58 is interposed between the sleeve 52 and the sleeve support bushing 54.

The sleeve coupling ring 59 and the spring support ring 60 are coupled to the upper end of the sleeve 52. The diaphragm 55 is interposed between the sleeve coupling ring 59 and the spring support ring 60, and the diaphragm 55 is coupled to the upper end of the sleeve 52. The diaphragm 55 has a through hole 55a into which the sleeve 52 is inserted, and the circumference thereof is clamped between the first housing engaging portion 25 and the second housing engaging portion 42. One end of the sleeve pressing spring 53 is supported by the engaging jaw 61 in the sleeve support bushing 54 and the other end thereof is supported by the spring support ring 60.

The first flow rate control unit 50 pushes the sleeve 52 toward the first valve seat 35 while the diaphragm 55 elastically deforms when the pressure in the outlet flow passage 45 becomes equal to or greater than a predetermined pressure. . At this time, the gap between the lower end of the sleeve 52 and the first valve seat 35 is narrowed, so that the flow resistance of the fluid flowing into the passage 51 of the sleeve 52 from the connection flow path 29 becomes large.

Thus, the flow rate of the fluid flowing into the passage 51 of the sleeve 52 is reduced. When the flow rate of the fluid flowing into the outflow channel 45 decreases so that the pressure in the outflow channel 45 is lower than a predetermined pressure, the sleeve 52 is moved to its original position while the sleeve pressurizing spring 53 is elastically restored so that the sleeve ( The gap between the lower end of 52 and the first valve seat 35 opens again.

As such, the first flow rate adjusting unit 50 automatically adjusts the flow rate of the fluid flowing in the outflow channel 45 by moving the sleeve 52 according to the pressure change of the outflow channel 45.

As shown in Figs. 2, 3 and 5, the second flow control unit 63 is installed in the mounting portion 43 of the upper housing 22 to be coupled to the actuator (5). The second flow rate control unit 63 is for adjusting the flow rate of the fluid through the second orifice 46, the stem 64 protruding from the valve body 20 so that the upper end can be coupled to the actuator 5. , A stem pressing spring 65 for providing elastic force to the stem 64, a hollow guide plug 66 and an auxiliary guide plug 67 for slidably supporting the stem 64, and an upper housing 22 Of the hollow support plug 68 coupled to the installation hole 43a of the support hole movably supporting the guide plug 66, and the distance adjusting bushing 69 interposed between the guide plug 66 and the support plug 68. ).

The stem 64 includes a rod 71 slidably inserted into the guide plug 66 and a packing 72 coupled to the lower end of the rod 71. The stem 64 is moved by an actuator 5 coupled to the valve body 20 and through the second orifice 46 by approaching the second valve seat 49 or away from the second valve seat 49. Adjust the flow rate of the fluid. An o-ring 73 and support ring 74 are interposed between the stem 64 and the guide plug 66 to prevent leakage of fluid.

The stem pressure spring 65 is located between the first spring support ring 75 disposed inside the guide plug 66 and the second spring support ring 76 coupled to the stem 64. The stem pressurizing spring 65 provides an elastic force against the stem 64 in a direction away from the second valve seat 49. Therefore, when the actuator 5 pushes the stem 64 toward the second valve seat 49, the stem pressurizing spring 65 is compressed and elastically deformed. When the pressing force of the actuator 5 is removed, the stem pressurizing spring 65 is removed. Return the stem 64 to its original position.

As shown in Figures 2 and 5, the guide plug 66 is coupled to the support plug 68 so as to be movable up and down, and to prevent the leakage of fluid between the guide plug 66 and the support plug 68. O-ring 77 is interposed. The guide plug 66 is provided with a female thread 79 for screwing with the auxiliary guide plug 67 and a male thread 80 for screwing with the distance adjusting bushing 69. The lower end of the guide plug 66 is provided with a non-circular coupling portion 81. The coupling portion 81 has a shape corresponding to the non-circular coupling hole 85 provided in the support plug 68. By joining these non-circular engaging portions 81 and the engaging holes 85 with each other, the guide plug 66 can be linearly moved up and down, but rotational movement is suppressed.

 The auxiliary guide plug 67 is screwed to the upper end of the guide plug 66 to slidably support the upper end of the stem 64. The auxiliary guide plug 67 has a male thread 82 corresponding to the female thread 79 of the guide plug 66 and a through hole 67a into which the rod 71 of the stem 64 is inserted.

The support plug 68 is coupled to the mounting portion 43 of the valve body 20 to support the guide plug 66 to be movable up and down. The support plug 68 has a male thread 83 corresponding to the female thread 44 of the mounting portion 43 and is screwed to the mounting portion 43. An O-ring 84 is interposed between the support plug 68 and the installation portion 43 to prevent leakage of the fluid. As described above, the lower end of the support plug 68 is provided with a non-circular coupling hole 85 into which the coupling portion 81 of the guide plug 66 is inserted. On the outer circumferential surface of the support plug 68, a male screw thread 86 for fixing the actuator 5 is provided.

As shown in FIGS. 2 and 5, the distance adjusting bushing 69 is rotatably interposed between the guide plug 66 and the support plug 68. The distance adjusting bushing 69 has a female thread 87 corresponding to the male threaded 80 of the guide plug 66 and is screwed with the guide plug 66. The distance adjusting bushing 69 may rotate in the support plug 68, but the up and down movement is suppressed by the fixing ring 88. The fixing ring 88 is inserted into the fixing groove 68a provided on the inner circumferential surface of the support plug 68 and the locking groove 69a provided on the outer circumferential surface of the distance adjusting bushing 69 to move up and down of the distance adjusting bushing 69. To limit. When the distance adjusting bushing 69 rotates, the guide plug 66 screwed thereto moves in the vertical direction.

On the outer circumferential surface of the distance adjusting bushing 69, a tooth 89 for coupling with the indicator ring 90 is provided. The indicator ring 90 is coupled with the distance adjusting bushing 69 so as to rotate together with the distance adjusting bushing 69, the inner circumferential surface of which the teeth 91 corresponding to the teeth 89 of the distance adjusting bushing 69 are provided. Prepared. And the upper surface of the indicator ring 90 is provided with a groove coupling tool 90a for coupling the tool and a scale 90b for displaying the rotation angle. When the user engages the tool to the tool engaging portion 90a of the indicator ring 90 and turns the indicator ring 90, the distance adjusting bushing 69 rotates so that the guide plug 66 descends or rises. The gap between the indicator ring 90 and the guide plug 66 is blocked by a cover 92 covering the auxiliary guide plug 67.

Hereinafter, with reference to the accompanying drawings will be described the operation of the flow control valve 10 according to an embodiment of the present invention.

As shown in FIG. 6, the fluid flowing into the valve body 20 through the inlet 24 flows along the inflow passage 27 to pass through the strainer 30 and then passes through the first orifice 28. It flows into the connecting passage 29 through. The fluid flowing into the connecting passage 29 enters the passage 51 of the sleeve 52 through the gap between the first valve seat 35 of the sleeve 52 and the lower end of the sleeve 52, and continues to connect. It passes through the upper chamber 47a and the second orifice 46 of the chamber 47 and flows into the outflow passage 45. Most of the fluid flowing into the outlet passage 45 flows out of the valve body 20 through the outlet 40, and part of the fluid flows through the connection chamber (a) along the first branch passage 37 and the second branch passage 48. 47 flows into the lower chamber 47b.

As such, when the internal pressure of the outlet flow passage 45 is greater than the predetermined pressure while the fluid passes through the inside of the valve body 20, the sleeve pressurizing spring 53 and the diaphragm 55 are deformed by the pressure, and the sleeve ( 52) is lowered. At this time, the gap between the first valve seat 35 and the lower end of the sleeve 52 is reduced, so that the flow rate of the fluid flowing into the passage 51 of the sleeve 52 from the connecting passage 29 is reduced. When the flow rate of the fluid through the sleeve 52 is reduced in this way, the flow rate of the outflow passage 45 decreases, so that the pressure in the outflow passage 45 becomes small.

When the pressure in the outlet flow passage 45 is lower than the predetermined pressure, the elastic force of the sleeve pressurizing spring 53 and the diaphragm 55 causes the sleeve 52 to rise to its original state and the fluid flowing through the sleeve 52 The flow rate is increased again. As such, in the flow control valve 10 according to the exemplary embodiment of the present invention, the pressure at the outlet 40 may be kept constant by the action of the first flow control unit 50. Here, the constant pressure is a pressure corresponding to the force of the elastic force of the sleeve pressing spring 53 and the elastic force of the diaphragm 55.

7 and 8 illustrate the operation of the second flow control unit 63. When the actuator 5 presses the stem 64 toward the second valve seat 49 as shown in FIG. 7, the stem ( The packing 72 of 64 approaches the second valve seat 49. At this time, the flow resistance of the fluid flowing through the second orifice 46 through the second orifice 46 to the outlet passage 45 is increased, so that the flow rate of the fluid flowing into the outlet passage 45 through the second orifice 46 is increased. Will decrease. When the external force by the actuator 5 is removed, the stem 64 returns to its original position by the elastic restoring force of the stem pressurizing spring 65, thereby increasing the flow rate of the fluid through the second orifice 46 again.

On the other hand, as shown in FIG. 8, when the user rotates the distance adjusting bushing 69 in one direction by using the indicator ring 90, the screw motion between the guide plug 66 and the distance adjusting bushing 69 is caused. The guide plug 66 moves downward. When the guide plug 66 is lowered, the stem 64 supported thereon is also lowered so that the setting height of the stem 64 is lowered. At this time, regardless of the operation of the actuator 5, the flow rate of the fluid flowing into the outlet passage 45 through the second orifice 46 is reduced. On the contrary, by moving the guide plug 66 upward, the flow rate of the fluid flowing into the outlet passage 45 through the second orifice 46 may be increased regardless of the operation of the actuator 5.

As such, when the setting height of the stem 64 is adjusted by using the indicator ring 90 and the distance adjusting bushing 69, the flow rate adjusting range of the actuator 5 may be changed, or the flow rate of the actuator 5 may be adjusted. Frequency of operation can be reduced.

As described above, the flow control valve 10 according to an embodiment of the present invention can maintain a constant pressure on the outlet 40 side through the first flow control unit 50, the second flow control unit ( 63) the flow rate can be precisely adjusted. Therefore, the flow rate can be easily adjusted and the reliability of the product can be increased.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Accordingly, these modifications and variations are intended to fall within the scope of the present invention as long as it is obvious to those skilled in the art.

10: flow control valve 20: valve body
21: lower housing 22: upper housing
23: inlet 25, 42: first, second housing coupling portion
27: inflow channel 28, 46: the first and second orifices
29: connecting euro 30: sieve
31 closing plug 35, 49 first and second valve seat
37, 48: 1st and 2nd branch euro 40: outlet
45: outflow passage 47: connection chamber
50, 63: 1st, 2nd flow control unit 52: Sleeve
53 sleeve sleeve spring 54 sleeve support bushing
55: diaphragm 59: sleeve coupling ring
60: sleeve support ring 64: stem
65 stem pressure spring 66 guide plug
67: auxiliary guide plug 68: support plug
69: distance adjustable bushing 71: rod
72: packing 88: retaining ring
90: indicator 92: cover

Claims (7)

An inflow passage, a connection passage, a first orifice connecting the inflow passage and the connection passage, a connection chamber connected to the connection passage, an outlet passage, a second orifice connecting the connection chamber and the outlet passage, and the outlet passage; A valve body having an installation hole connected thereto;
A first valve seat disposed in the connection passage;
A second valve seat provided with the second orifice and disposed in the outlet passage;
A sleeve having a passage for guiding the fluid flowing into the connection channel to the connection chamber, the sleeve being movable in the valve body;
A sleeve press spring providing an elastic force with respect to the sleeve in a direction away from the first valve seat;
A diaphragm coupled to the sleeve, the diaphragm being elastically deformed when the pressure in the outlet flow path is greater than the elastic force of the sleeve pressing spring to exert an external force in a direction closer to the first valve seat with respect to the sleeve;
A stem movably installed in the installation hole so as to be close to or away from the second valve seat, one end of which protrudes out of the valve body; And
And a stem pressurizing spring for providing an elastic force to said stem.
The method of claim 1,
And a sleeve support bushing disposed between the connection flow passage and the connection chamber and into which the sleeve is movably inserted.
The method of claim 1,
A hollow guide plug having a stem inserted therein and having a male thread;
A hollow support plug to which the guide plug is movably coupled and coupled to the installation hole; And
A distance provided with a female thread corresponding to the male thread of the guide plug to be screwed to the guide plug, and rotatably disposed between the guide plug and the support plug to move the guide plug during rotation Regulating bushing; flow control valve further comprising.
The method of claim 3, wherein
The support plug has a non-circular engaging hole, and the guide plug has a non-circular engaging part inserted into the engaging hole of the support plug so that rotational movement is suppressed.
The method of claim 3, wherein
A flow control valve coupled to the distance control bushing so as to rotate with the distance control bushing, further comprising an indicator ring having a scale for indicating a rotation angle and a tool engagement portion to which the tool can be coupled; .
The method of claim 1,
It has a plurality of holes to filter foreign matter contained in the fluid flowing into the valve body through the inlet provided in the valve body to be connected to the inflow passage for the inflow of the fluid, the inflow passage and the first A flow control valve further comprising a strainer disposed between the orifices.
The method of claim 1,
The valve body has a boss disposed in the connection passage, the first valve seat is a flow control valve, characterized in that coupled to the coupling groove provided in the boss.

Images