JP2007064423A - Pressure control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure control valve capable of coping with both of high pressure and vacuum pressure, and having high safety. <P>SOLUTION: This pressure control valve 100 comprises a main body capable of expanding and contracting its total length by changing fastening quantity in screwing an inner cylinder 30 and an outer cylinder 10, a valve seat 34 formed inside of the inner cylinder 30, a valve element 40 pressed to the valve seat 34, and a helical spring 44 for changing the force for pressing the valve element 40 to the valve seat 34 by expanding and contracting the total length of the main body. In this pressure control valve 100 having the constitution mentioned above, the valve element 40 is separated from the valve seat 34 by applying positive or negative pressure to either end portion of the cylindrical main body. The main body comprises a set screw 24 for preventing rotation of the outer cylinder 10 to fix the force for pressing the valve element 40 to the valve seat 34, and a limit value setting nut 50 for limiting the fastening quantity of the outer cylinder 10 to control the force for pressing the valve element 40 to the valve seat 34 to be smaller than critical pressure acting on a pressure control unit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pressure control valve including functions such as a safety valve, a relief valve, and a pressure reducing valve.

  Conventionally, pressure control valves have been used for high-pressure vessels and high-pressure pipes that store fluids exceeding atmospheric pressure, and for pressure vessels that are used for vacuum vessels and vacuum pipes that have a lower pressure than the atmosphere. . For this reason, it has to be used properly according to the application, and it is troublesome to prepare a plurality of types of pressure control valves when mounting the pressure control valve. In addition, in a factory or the like that handles these pressure control valves, inventory management becomes complicated, and it is necessary to take extra management space.

In view of such a situation, the present applicant has proposed a pressure control valve disclosed in Patent Document 1. The pressure control valve disclosed in Patent Document 1 forms connection portions connectable to a high-pressure pipe or the like at both ends of a main body formed in a cylindrical shape, and selectively connects any of the connection portions to the high-pressure pipe or the like. Therefore, it is configured to be able to cope with both high pressure and vacuum pressure. Moreover, the cylindrical main body is formed by screwing two cylindrical bodies, and the operating pressure of the valve body arranged inside the main body according to the rotation ratio (tightening amount) at the time of screwing. Can be adjusted.
JP 2003-322265 A

  If it is a pressure control valve indicated in patent documents 1, it can respond to various pressure control equipment, such as a high-pressure vessel and high-pressure piping, a vacuum vessel, and vacuum piping, with one pressure control valve. Further, in the case of the pressure control valve disclosed in Patent Document 1, the operating pressure of the valve body can be adjusted by changing the tightening amount of the cylinder, so that the operating pressure of the valve body can be adjusted according to the installation location. Can be changed.

  However, although the pressure control valve disclosed in Patent Document 1 can determine the operating pressure of the valve body, it cannot confirm whether the operating pressure is an appropriate value. For example, even if the set operating pressure of the valve body is a dangerous pressure in the pressure control device to be controlled, there is no way of knowing it at the time of adjustment. For this reason, there is a risk of damaging the pressure control device if the adjustment is incorrect.

  Therefore, in the present invention, it is a pressure control valve that can cope with both high pressure and vacuum pressure, and it is safe to set the dangerous pressure at the installation location and the set pressure at the time of use individually. An object is to provide an excellent pressure control valve.

  In order to achieve the above object, a pressure control valve according to the present invention comprises a valve seat on a main body, a valve body that is pressed against the valve seat, and a pressing means that presses the valve body against the valve seat. A pressure control valve configured to separate the valve body from the valve seat by applying pressure or negative pressure to the main body from any direction via the valve body, A pressing force setting means for setting a force for pressing the valve body against the valve seat to a set value, and a force for the pressing means to press the valve body against the valve seat is smaller than a dangerous pressure acting on the pressure control device. And a dangerous pressure setting means for limiting the pressure so as to be limited.

  Further, a specific configuration of the pressure control valve according to the present invention for achieving the above object includes a main body capable of extending and contracting the entire length by changing a tightening amount when screwing two cylindrical bodies. The valve seat formed inside any one of the cylindrical bodies, the valve body pressed against the valve seat, and the force for pressing the valve body against the valve seat by expanding and contracting the entire length of the main body A pressure control valve configured to separate the valve body from the valve seat by applying pressure or negative pressure to any end of the cylindrical main body. The main body has a pressing force setting means for preventing the rotation of the cylinder to set the force for pressing the valve body against the valve seat to a set value, and the force for pressing the valve body against the valve seat is pressure control. Tighten the cylinder so that it is less than the dangerous pressure acting on the equipment. A dangerous pressure setting means for limiting, as long as that comprising the.

  In the pressure control valve having the above-described configuration, the main body includes an inner cylinder having a male screw portion and an outer cylinder having a female screw portion, and the pressing force setting means includes a female screw portion. The dangerous pressure setting means is a nut that is screwed into a male screw portion of the inner cylinder to which the outer cylinder in which the female screw portion is formed is screwed, and the nut is a set screw. It is desirable to provide. By using the pressing force setting means as a set screw provided in the outer cylinder, the configuration becomes very simple. In addition, since stepless adjustment is possible, fine adjustment according to the location of use is possible. Further, unlike the case of fixing by tightening using a lock nut or the like, there is no possibility of deviation between the set value and the fixed value. In addition, since the dangerous pressure setting means is a nut, it is easy to adjust the position where the rotation of the outer cylinder is restricted. Furthermore, by providing a set screw on the nut, it is possible to fix one nut in place without using a double nut.

  According to the pressure control valve having the characteristics as described above, the dangerous pressure (limit pressure) at the mounting location can be set by the dangerous pressure setting means. Further, by providing the pressing force setting means, the set pressure during use can be adjusted and fixed. That is, by providing the pressure control valve body as a separate unit for the pressing force setting means and the dangerous pressure setting means, the dangerous pressure at the mounting location and the set pressure at the time of use can be prepared quickly and individually. It is possible to provide a pressure control valve with excellent safety.

  Hereinafter, embodiments of the pressure control valve of the present invention will be described with reference to the drawings. In addition, embodiment shown below is one part embodiment which concerns on the pressure control valve of this invention, and this invention includes a various form in the limit which does not change the principal part.

  First, the form of the pressure control valve 100 itself according to the present embodiment will be described with reference to FIGS. FIG. 1 is a view showing the outer shape of the pressure control valve 100 of the present embodiment, and FIG. 2 is a view showing the AA cross section in FIG.

  The pressure control valve 100 according to the present embodiment includes a main body formed in a cylindrical shape, a valve body 40 disposed in the main body, and a pressing unit that presses the valve body 40 against a valve seat 34 formed in the main body. And the basic configuration.

  The main body is constituted by a pair of cylinders of an inner cylinder 30 and an outer cylinder 10. The inner cylinder 30 has a male screw part 32 in which a thread groove is formed on the outer side of the cylinder from one end part to the body part. The outer tube 10 is formed with a female screw portion 12 that can be screwed into a male screw portion 32 formed on the inner tube 30 from one end portion to the body portion. Further, the inner cylinder 30 and the outer cylinder 10 are respectively formed with similar thread grooves 36 and 16 at the other end, so that a fluid pressure vessel exceeding the atmospheric pressure (hereinafter referred to as a high pressure vessel) and exceeding the atmospheric pressure. Connection to a pressure pipe (hereinafter referred to as a high-pressure pipe), a vacuum vessel and a vacuum pipe is possible. The main body is configured by screwing the inner cylinder 30 and the outer cylinder 10 having such a configuration.

  The inner cylinder 30 is formed with a valve seat 34 in a flow path through which a fluid passes, and the outer cylinder 10 is formed with a rib 14. The valve seat 34 has a shape corresponding to the contact surface of the valve body 40. When the valve body 40 is pressed against the valve seat 34, the flow path is closed and the flow of fluid is made. It can be stopped. The valve body 40 has, for example, a disk shape, and has a configuration in which an inclined portion 46 is formed at an end portion around the valve body, and the inclined portion 46 is pressed against the valve seat 34. I need it.

  The valve body 40 is provided with a rod 42 extending in the arrangement direction of the outer cylinder 10, and the rod 42 is arranged so as to pass through the center of the rib 14 formed in the outer cylinder 10. The rod 42 is provided with a string spring 44 as a pressing means for pressing the valve body 40 against the valve seat 34, and a spring seat 18 that receives the repulsive force of the string spring 44 is provided at the center of the rib 14. . The spring seat 18 has a through hole in the center for allowing the rod to slidably pass therethrough, is fixed to the rib, and also serves as a bearing.

  By arranging the valve body 40, the string spring 44, and the spring seat 18 having such a configuration between the valve seat 34 of the inner cylinder 30 and the rib 14 of the outer cylinder 10, the string spring 44 and the spring seat 18 are arranged. It will be sandwiched between the valve body 34. For this reason, the compression rate of the coiled spring 44 is changed by changing the rotation ratio when the inner cylinder 30 and the outer cylinder 10 are screwed together (changing the tightening amount of the outer cylinder 10 with respect to the inner cylinder 30). Become. That is, by changing the tightening amount of the outer cylinder 10 with respect to the inner cylinder 30, the force that presses the valve body 40 against the valve seat 34, in other words, the force required when the valve body 40 moves away from the valve seat 34 ( The operating pressure of the valve body 40 can be adjusted.

  Flange portions 38 and 20 are formed in the inner cylinder 30 and the outer cylinder 10, respectively, in order to easily rotate when the two are screwed together. The shapes of the flange portions 38 and 20 are not particularly limited. For example, a jig such as a spanner or a wrench is used as a rotation assist, and at least a pair of parallel planes can be gripped and rotated by the jig. It is good to make it into a shape with, preferably a hexagonal nut shape.

  The flange portion 38 of the inner cylinder 30 is preferably formed at the root of the male screw portion 32, and the flange portion 20 of the outer cylinder 10 is preferably formed at the tip of the female screw portion 12, that is, one end portion. When the flange portions 38 and 20 of the inner cylinder 30 and the outer cylinder 10 are formed in this way, both flange portions 38 and 20 have a function of regulating the tightening amount of the outer cylinder 10 with respect to the inner cylinder 30. . In other words, the pressure control valve 100 itself is prevented from being damaged by overtightening the outer cylinder 10 with respect to the inner cylinder 30. Further, in the pressure control valve 100 of the present embodiment, a through hole (screw hole) 22 provided with a thread groove is formed in the flange portion 20 of the outer cylinder 10. A set screw 24 is provided in the screw hole 22, and the outer cylinder 10 is tightened at an arbitrary ratio with respect to the inner cylinder 30, and then the set screw 24 is tightened to The tube 10 can be fixed. With this configuration, the tightening amount between the inner cylinder 30 and the outer cylinder 10 does not change during the use of the pressure control valve 100, and the operating pressure of the valve body 40 is reduced. It can be stabilized.

  Further, in the pressure control valve 100 of the present embodiment, a limit value setting nut 50 is provided in the male thread portion 32 of the inner cylinder 30. The limit value setting nut 50 is used to tighten the outer cylinder 10 so that the operating pressure of the valve body 40 does not exceed the dangerous pressure specified for the high pressure vessel and high pressure piping to which the pressure control valve 100 is attached and the vacuum vessel and vacuum piping. It is a nut that sets the limit value of the amount of insertion. For example, when the limit value setting nut 50 is disposed at a position where the operating pressure of the valve body 40 becomes lower than the dangerous pressure of a certain high-pressure vessel when the outer cylinder 10 is tightened with respect to the inner cylinder 30, the outer cylinder 10 is It becomes impossible to tighten more than the arrangement position of the limit value setting nut 50. For this reason, when the limit value setting nut 50 is arranged as described above, there is no possibility that the operating pressure of the valve body 40 becomes higher than the dangerous pressure of the high-pressure vessel. Therefore, it is possible to prevent a situation in which a pressure control device such as a high-pressure vessel is damaged due to excessive operating pressure of the valve body 40.

  The limit value setting nut 50 having the above action is formed with a through hole (screw hole) 52 provided with a thread groove, like the flange portion 20 of the outer cylinder 10. As with the flange portion 20, a set screw 54 is provided in the screw hole 52, and the limit value setting nut 50 is fixed at an arbitrary position of the male screw portion 32 by tightening the set screw 54. be able to. For this reason, it is possible to avoid a situation in which the set position of the limit value setting nut 50 is shifted while the pressure control valve 100 is being used. The shape of the limit value setting nut 50 is not particularly limited, but in consideration of cost, it may be a normal hexagonal nut shape or a simple ring shape. Further, when the limit value setting nut 50 is formed in a ring shape, it is desirable that the surface is subjected to knurling or the like for preventing slipping.

  As described above, in the pressure control valve 100 of the present embodiment, the tightening amount of the outer cylinder 10 and the arrangement position of the limit value setting nut 50 can be individually set and fixed at arbitrary positions. That is, it becomes possible to individually set the dangerous pressure corresponding to the high-pressure vessel and high-pressure piping to which the pressure control valve 100 is attached, the vacuum vessel and the vacuum piping, and the operating pressure of the valve body 40 required for actual operation, It is possible to perform pressure control while ensuring the safety of the pressure control valve 100.

  In addition, since the pressure control valve 100 of the present embodiment has a structure including screw portions (thread grooves) 16 and 36 at both ends of the main body, the pressure control valve 100 is not connected to the high pressure vessel, the high pressure piping, the vacuum vessel, and the vacuum piping. A cover 60 and a pipe 70 as shown in FIG. 3 and FIG. 4 can be connected to the screw parts 16 and 36. As shown in FIG. 3, the cover 60 has a structure for discharging the fluid or changing the suction direction toward the pressure control valve 100, and the fluid discharged (spouted) from the pressure control valve 100. However, the risk of direct contact with surrounding equipment and workers can be reduced. Specifically, it comprises a flow path 64 that guides the discharged fluid to the periphery of the pressure control valve 100, and a housing 62 that forms the flow path 64. The housing 62 has a thick central portion. The shape of the flow path is deformed so that the exhausted fluid flows smoothly dispersed.

  Further, when the pipe 70 is connected as shown in FIG. 4, the discharged fluid can be collected and reused. For this reason, the pressure control valve of this embodiment can respond even when the fluid is a liquid or the like. Further, even when the fluid to be handled is harmful, it is possible to lead to a route for performing an appropriate disposal process.

  In the above description, only the set screws 24 and 54 are provided in the screw holes 22 and 52 provided in the flange portion 20 of the outer cylinder 10 and the limit value setting nut 50. However, the screw holes 22 and 52 may be provided with a stop guide 80 having a groove that meshes with the male thread portion 32 of the inner cylinder 30 as shown in FIGS. Note that FIG. 5B is a diagram showing a BB cross section in FIG. The stop guide 80 has, for example, a groove portion 82 that meshes with the male screw portion 32 on the front end side, and has a flat surface on the rear end side so as to be pushed by the set screws 24 and 54, and is male at a predetermined angle. What is necessary is just to set it as the structure which has the guide part 84 so that it may contact | abut to the screw part 32. FIG. When the stop guide 80 having such a configuration is provided, a guide groove 86 for sliding the guide portion 84 may be provided in the screw holes 22 and 52. As described above, even if the outer cylinder 10 or the limit value setting nut 50 is fixed to the inner cylinder 30 by tightening the set screws 24 and 54 by providing the locking guides 80 in the screw holes 22 and 52. There is no risk of crushing the threads of the male thread portion 32 formed in the inner cylinder 30. For this reason, even if it is a case where the amount of tightening of the outer cylinder 10 with respect to the inner cylinder 30 is changed over several times, it becomes possible to rotate smoothly. In addition, when the stop guide 80 is comprised with elastic bodies, such as rubber | gum, even if it does not provide the groove part 82, it is thought that the same effect can be acquired.

  The pressure control valve 100 having the above configuration can be adapted to both pressure control in the high-pressure vessel and the high-pressure pipe, and pressure control in the vacuum vessel and the vacuum pipe.

  First, the case where it uses for the pressure control of a high pressure vessel and high pressure piping is demonstrated with reference to FIG. When pressure control of the high-pressure vessel and the high-pressure piping is performed, in the pressure control valve 100 having the above-described configuration, the screw portion 36 formed at the other end of the inner cylinder 30 is attached to the pressure control device (high-pressure vessel and high-pressure piping). Screwed on. The limit value setting nut 50 provided in the male thread portion 32 of the inner cylinder 30 operates the valve element 40 at a pressure where the tightening amount of the outer cylinder 10 is lower than the dangerous pressure of the pressure control device to which the pressure control valve 100 is attached. Place it at a position that will be the tightening amount. After the arrangement position of the limit value setting nut 50 is determined, the limit value setting nut 50 is fixed by tightening a set screw 54 provided in the screw hole 52.

  After the limit value setting nut 50 is fixed, the outer cylinder 10 is tightened with respect to the inner cylinder 30, and the pressing force of the string spring 44, that is, the operating pressure of the valve body 40 is adjusted by adjusting the tightening amount. After adjusting the tightening amount of the outer cylinder 10 to arbitrarily determine the operating pressure of the valve body 40, the set screw 24 provided in the screw hole 22 formed in the flange portion 20 is tightened to The rotation of the tube 10 is prevented.

  In the pressure control valve 100 set as described above, the fluid pressure in the pressure control device such as the high pressure pipe connected to the other end of the inner cylinder 30 or the high pressure vessel is higher than the operating pressure of the valve body 40. In this case, it operates to discharge the fluid in the high-pressure pipe or high-pressure vessel. Specifically, when the fluid pressure in the pressure control device becomes higher than the operating pressure of the valve body 40, the valve body 40 is pulled up in the direction of arrow A, that is, in the direction of the outer cylinder 10, as shown in FIG. And away from the valve seat 34. By separating the valve body 40 from the valve seat 34, a fluid flow path is formed inside the pressure control valve 100, and the fluid flows into the main body of the pressure control valve 100 through the flow path. The fluid flowing into the main body passes through the rib and is discharged from the other end of the outer cylinder 10 to the outside of the pressure control valve 100. Here, when the cover 60 is provided at the other end of the outer cylinder 10, the fluid is discharged to the outside of the pressure control valve 100 through the cover 60. Note that arrows other than A indicate the flow of fluid discharged from the pressure control device.

  Next, a case where the pressure control valve 100 having the above configuration is used for pressure control of a vacuum vessel and a vacuum pipe will be described with reference to FIG. When pressure control of the vacuum vessel and the vacuum pipe is performed, in the pressure control valve 100 having the above-described configuration, the screw portion 16 formed at the other end of the outer cylinder 10 is attached to the pressure control device (vacuum vessel, vacuum pipe, etc.). Screwed on. The limit value setting nut 50 provided in the male thread portion 32 of the inner cylinder 30 operates the valve body 40 with a force that the tightening amount of the outer cylinder 10 is smaller than the dangerous pressure of the pressure control device to which the pressure control valve 100 is attached. It arranges in the position which becomes the tightening amount. After the arrangement position of the limit value setting nut 50 is determined, the limit value setting nut 50 is fixed by tightening the set screw 24 provided in the screw hole 22.

  After fixing the limit value setting nut 50, the inner cylinder 30 is tightened with respect to the outer cylinder 10, and the pressing force of the string spring 44, that is, the operating pressure of the valve body 40 is adjusted by adjusting the tightening amount. After adjusting the tightening amount of the inner cylinder 30 to arbitrarily determine the operating pressure of the valve body 40, the set screw 24 provided in the screw hole 22 formed in the flange portion 20 of the outer cylinder 10 is tightened to The inner cylinder 30 is prevented from rotating with respect to the cylinder 10.

  In the pressure control valve 100 set as described above, the vacuum pressure in the pressure control device such as a vacuum pipe connected to the other end of the outer cylinder 10 or a vacuum vessel is higher than the operating pressure of the valve body 40. Operates to take in external fluids when high. Specifically, when the vacuum pressure in the pressure control device becomes higher than the operating pressure of the valve body 40, the valve body 40 is pulled down in the direction of arrow B, that is, in the direction of the outer cylinder 10, as shown in FIG. And away from the valve seat 34. By separating the valve body 40 from the valve seat 34, a fluid flow path is formed inside the pressure control valve 100, and from outside the pressure control valve 100 to the inside of the main body of the pressure control valve 100 via the flow path. Fluid flows in. The fluid that has flowed into the main body passes through the rib 14 and flows into the pressure control device from the other end of the outer cylinder 10. The arrows other than B indicate the flow of fluid flowing from the outside of the pressure control valve 100 into the pressure control device.

  According to the pressure control valve 100 as described above, the screwing ratio between the outer cylinder 10 and the inner cylinder 30 and the arrangement position of the limit value setting nut 50 can be individually set at arbitrary positions. For this reason, it is possible to individually set the dangerous pressure corresponding to the high-pressure vessel and high-pressure piping to which the pressure control valve 100 is attached, the vacuum vessel and the vacuum piping, and the operating pressure actually required for the operation of the valve body 40. It becomes possible. Therefore, the pressure control valve 100 can be made highly safe.

  In the above embodiment, the inner cylinder 30 is provided with the valve seat 34 and the outer cylinder 10 is provided with the ribs 14, but the outer cylinder 10 is provided with the valve seat and the inner cylinder 30 is provided with the ribs. Can also be regarded as an embodiment according to the pressure control valve 100 of the present invention. In the embodiment, a set screw is employed as the rotation preventing means. However, any configuration may be used as long as the rotation between the outer cylinder 10 and the inner cylinder 30 can be stopped. Further, in the embodiment, the rib 14 and the spring seat 18 are described as having a separate structure, but of course, they may be integrated. Further, in the embodiment, the pressure control valve 100 is configured to change the operating pressure of the valve body 40 by screwing the cylindrical body, but may have other configurations.

It is a figure which shows the external appearance shape of the pressure control valve which concerns on this invention. It is a figure which shows the AA cross section in FIG. It is a figure which shows the example at the time of providing the cover in the fluid discharge side edge part of a pressure control valve. It is a figure which shows the example at the time of connecting piping to the fluid discharge side edge part of a pressure control valve. It is a figure which shows the application example of a rotation prevention means. It is a figure which shows the operating state of the pressure control valve attached to the high pressure piping and the high pressure vessel. It is a figure which shows the operating state of the pressure control valve attached to the vacuum piping and the vacuum vessel.

Explanation of symbols

  10 ......... Outer cylinder, 12 ......... Female thread part, 14 ......... Rib, 16 ......... Screw part (thread groove), 18 ......... Spring seat, 20 ......... Flange part, 22 ......... Screw hole, 24 ......... Set screw, 30 ......... Inner cylinder, 32 ......... Male thread part, 34 ......... Valve seat, 36 ......... Screw part (thread groove), 38 ......... Flange part, 40 ......... Valve, 42 ......... Rod, 44 ......... Wound spring, 50 ......... Limit setting nut, 52 ......... Screw hole, 54 ......... Set screw, 60 ......... Cover, 70 ……… Piping, 100 ……… Pressure control valve.

Claims (3)

The main body includes a valve seat, a valve body that is pressed against the valve seat, and a pressing unit that presses the valve body against the valve seat. A pressure control valve configured to separate the valve body from the valve seat by applying pressure or negative pressure from a direction;
A pressing force setting means for setting a force by which the pressing means presses the valve body against the valve seat to a set value;
A pressure control valve, comprising: dangerous pressure setting means for restricting the pressing means so that a force pressing the valve body against the valve seat is smaller than a dangerous pressure acting on the pressure control device. A main body that can be expanded and contracted by changing the amount of tightening when two cylinders are screwed together, a valve seat formed inside one of the cylinders, and pressing against the valve seat And a pressing means for changing the force that presses the valve body against the valve seat by expanding and contracting the entire length of the main body, and applied to any end of the cylindrical main body. A pressure control valve configured to separate the valve body from the valve seat by applying pressure or negative pressure,
In the main body, a pressing force setting means for preventing the rotation of the cylindrical body in order to set a force for pressing the valve body against the valve seat to a set value;
Danger pressure setting means for limiting a tightening amount of the cylinder so that a force for pressing the valve body against the valve seat is smaller than a dangerous pressure acting on the pressure control device, valve. The main body is composed of an inner cylinder having a male screw part and an outer cylinder having a female screw part,
The pressing force setting means is a set screw provided in an outer cylinder in which a female screw portion is formed,
The said dangerous pressure setting means is a nut to be screwed into a male screw portion of an inner cylinder to which an outer cylinder having a female screw portion is screwed, and the nut is provided with a set screw. The pressure control valve described in.

Images