CN213982168U - Pressure reducing valve - Google Patents

Abstract

The utility model relates to a pressure reducing valve, including valve body assembly, valve clack assembly and adjusting part, valve body assembly has seted up import, export, intercommunication chamber and pressure regulating port, the import communicates in the export through the intercommunication chamber, the intercommunication chamber communicates in the pressure regulating port, valve clack assembly sets up in the intercommunication chamber and controls the aperture of export, adjusting part sets up in the pressure regulating port and can act on valve clack assembly, valve clack assembly sets up in the intercommunication chamber, and valve clack assembly's one end stretches out the intercommunication chamber and the first end in the sealed intercommunication chamber of sliding under adjusting part's effect, valve clack assembly's the other end sets up in the intercommunication chamber, and can control the aperture between the second end in intercommunication chamber and the export; a balance cavity is formed between the valve clack assembly and the valve body assembly, a connecting channel communicated with the inlet and the balance cavity is formed in the valve clack assembly, and the valve clack assembly can balance pressure between the inlet and the balance cavity through the connecting channel. The pressure reducing valve prevents the pressure behind the valve from being suddenly increased, thereby avoiding the risk of tube explosion.

Description

Pressure reducing valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a relief pressure valve.

Background

The pressure reducing valve is a throttling element capable of locally adjusting the magnitude of fluid resistance when an abnormal phenomenon occurs in a delivery pipeline, and the pressure reducing valve is mainly used for protecting the delivery pipeline. If the pressure before the valve of relief pressure valve fluctuates, the pressure after the valve of relief pressure valve also can be influenced correspondingly, especially when the pressure before the valve of relief pressure valve sharply rises, there is the pressure after the valve of relief pressure valve to increase in the twinkling of an eye, and then leads to the risk of tube explosion easily.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for an improved pressure reducing valve that addresses the above-mentioned problems. This relief pressure valve is through setting up balanced chamber and communicating in balanced chamber and the connecting channel of import for balanced chamber can be used for timely response and alleviates pressure before the valve, so that the valve back pressure of relief pressure valve can not the sudden increase, thereby avoids the risk of bursting the pipe.

A pressure reducing valve comprises a valve body assembly, a valve clack assembly and an adjusting assembly, wherein the valve body assembly is provided with an inlet, an outlet, a communicating cavity and a pressure regulating port, the inlet is communicated with the outlet through the communicating cavity, the communicating cavity is communicated with the pressure regulating port, the valve clack assembly is arranged in the communicating cavity and controls the opening degree of the outlet, the adjusting assembly is used for adjusting pressure, the adjusting assembly is arranged in the pressure regulating port and can act on the valve clack assembly,

one end of the valve flap assembly is in sliding seal with the first end of the communicating cavity under the action of the adjusting assembly, and the other end of the valve flap assembly is arranged in the communicating cavity and can control the opening degree between the second end of the communicating cavity and the outlet; the valve clack assembly with be formed with balanced chamber between the valve body subassembly, set up on the valve clack assembly communicate in the import reaches the interface channel in balanced chamber, the valve clack assembly is when sealed the second end in intercommunication chamber, can pass through interface channel balance the import with the pressure between the balanced chamber.

Further, the valve flap assembly comprises a first valve flap and a second valve flap, and the first valve flap is arranged in the communication cavity and slidably seals the first end of the communication cavity; one end of the first valve clack extends out of the communication cavity and abuts against the adjusting assembly, the other end of the first valve clack is connected with the second valve clack, and the opening degree between the second end of the communication cavity and the outlet is controlled;

the balance cavity is formed between the second valve clack and the valve body assembly;

the first valve clack and the second valve clack are respectively provided with a first channel and a second channel which are communicated with each other, the second channel is communicated with the balance cavity, and the first channel and the second channel are spliced to form the connecting channel.

Furthermore, the valve body assembly is also provided with a pressure regulating cavity, the pressure regulating cavity is positioned between the pressure regulating port and the communicating cavity, and the pressure regulating cavity is communicated with the outlet; the first valve clack comprises a first sealing part, a second sealing part and a connecting part which are sequentially connected, the first sealing part is abutted to the adjusting assembly, extends out of the first end of the communicating cavity and is in sliding seal with the inner wall of the valve body assembly at the connecting part of the outlet and the pressure regulating cavity;

the second sealing part is positioned in the communicating cavity, and the second sealing part is abutted against the inner wall of the communicating cavity and seals the first end of the communicating cavity;

the connecting portion is located the second end of the communicating cavity and can be abutted against the end face of the second end.

Furthermore, the second valve flap comprises a mounting part and a sliding connection part which are connected with each other, a gasket groove is formed in the end face, facing the first valve flap, of the mounting part, a gasket is arranged between the gasket groove and the connection part, and the gasket can abut against the end face of the second end;

the sliding connection part and the valve body assembly form the balance cavity, and the sliding connection part seals the balance cavity in a sliding mode.

Furthermore, a third sealing element is arranged between the sliding connection part and the valve body assembly, and the sliding connection part abuts against and seals the balance cavity through the third sealing element.

Further, the number of the third sealing elements is two, and the third sealing elements are arranged in parallel along the axis direction of the valve clack assembly.

Further, the second valve flap further comprises a screwing portion which is arranged on the end face, relatively far away from the mounting portion, of the sliding connection portion and is used for an external tool to apply force to the second valve flap.

Further, the valve body assembly comprises a valve body and a second plug, the valve clack assembly is installed in the valve body, a port is formed in one side, close to the valve clack assembly, of the valve body, the port is communicated with the balance cavity, the second plug is detachably connected to the valve body and can seal the port, and the balance cavity is formed between the second plug and the valve core assembly.

Furthermore, the adjusting assembly comprises a pressure adjusting spring and an adjusting piece, and two ends of the pressure adjusting spring are respectively abutted against the valve clack assembly and the adjusting piece; the adjusting piece is arranged at the position of the pressure adjusting opening and can move along the axial direction of the valve body assembly.

Further, the reducing valve further comprises a plug, the valve body assembly is further provided with a bypass cavity, the bypass cavity is communicated with the outlet and the outside, and the plug seals an opening of the bypass cavity.

An embodiment of the utility model provides a pressure reducing valve, through setting up balanced chamber and communicating in balanced chamber and imported interface channel for balanced chamber can be used for in time responding and alleviate the pressure before the valve, so that the pressure can not violently increase behind the valve of pressure reducing valve, thereby avoids the risk of tube explosion.

Drawings

Fig. 1 is a schematic cross-sectional view of a pressure reducing valve according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the valve body assembly of the pressure reducing valve of FIG. 1 with portions of the valve body assembly omitted;

FIG. 3 is an enlarged schematic view of the pressure relief valve of FIG. 1 at A;

FIG. 4 is a schematic cross-sectional view of a first flap of the pressure relief valve of FIG. 1;

FIG. 5 is a schematic cross-sectional view of a second flap of the pressure relief valve of FIG. 1;

FIG. 6 is a schematic view of the second valve flap of FIG. 5 from another perspective;

FIG. 7 is a cross-sectional view of a second plug of the pressure relief valve shown in FIG. 1.

Description of the element reference numerals

100. A pressure reducing valve; 10. a valve body assembly; 11. an axis; 12. an inlet; 13. an outlet; 14. a communicating cavity; 141. a first end; 142. a second end; 15. a pressure regulating port; 16. a pressure regulating cavity; 17. a bypass cavity; 171. a first plug; 172. a sealing element; 18. a valve body; 19. a second plug; 191. a sealing step portion; 192. a seal ring; 20. a valve flap assembly; 21. a first valve flap; 211. a first seal portion; 2111. a first seal member; 2112. a first seal groove; 2113. an abutting portion; 2114. a groove; 212. a second seal portion; 2121. a second seal member; 2122. a second seal groove; 213. a connecting portion; 2131. an extension portion; 22. a second valve flap; 221. an installation part; 2211. a gasket groove; 2212. a thread groove; 222. a sliding connection portion; 2221. a third seal member; 2222. a third seal groove; 2223. a step surface; 223. a wrenching part; 2231. an inner hexagonal hole; 23. a gasket; 30. an adjustment assembly; 31. an adjustment member; 32. a pressure regulating spring; 40. a balancing chamber; 41. a connecting channel; 411. a first channel; 412. a second channel.

The present invention is described in further detail with reference to the drawings and the detailed description.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The utility model provides a relief pressure valve for install in each conveying line and can be according to the valve before and the aperture of the pressure automatic adjustment relief pressure valve behind the valve, thereby can correspondingly play the effect of throttle, with the protection conveying line.

The fluid in the pressure reducing valve 100 may be fluid in various states, including liquid, gas-liquid mixed fluid, gas, and the like. It should be explained that the opening degree is the size of the opening gap.

Referring to fig. 1 to 2, fig. 1 is a schematic cross-sectional view of a pressure reducing valve 100 according to an embodiment of the present invention; FIG. 2 is a schematic cross-sectional view of the valve body assembly 10 of the pressure relief valve 100 of FIG. 1, shown without some of its structure.

The pressure reducing valve 100 includes a valve body assembly 10, a flap assembly 20, and an adjustment assembly 30. The valve body assembly 10 is provided with an axis 11 and is provided with an inlet 12, an outlet 13, a communication cavity 14 and a pressure regulating port 15; the inlet 12 is communicated with the outlet 13 through a communication cavity 14, and the pressure regulating port 15 is communicated with one end of the communication cavity 14. The inlet 12 is for the entry of fluid; an outlet 13 for the fluid to flow out; the communicating cavity 14 is used for communicating the inlet 12, the outlet 13 and the pressure regulating port 15; the pressure regulating port 15 is used for installing the regulating assembly 30 and for an external tool to extend into and control the regulating assembly 30. The valve flap assembly 20 is arranged in the communication chamber 14 and can control the opening degree of the communication chamber 14 communicated with the outlet 13. The adjusting assembly 30 is disposed in the pressure adjusting opening 15, and one end of the adjusting assembly is fixed to the valve body assembly 10, and the other end of the adjusting assembly abuts against the valve flap assembly 20. The valve body assembly 10 is used for accommodating the valve clack assembly 20 and the adjusting assembly 30; the valve flap assembly 20 is used for sliding and sealing one end of the communication cavity 14 and controlling the opening of one end of the communication cavity 14 communicated with the outlet 13; the regulating assembly 30 is used for regulating the preset value of the pressure at the outlet 13 of the pressure reducing valve 100; the pressure regulating port 15 is used for an external tool to extend into and regulate the regulating assembly 30.

The end of the communicating chamber 14 communicating with the pressure regulating port 15 is a first end 141, and the end of the communicating chamber 14 relatively close to the outlet 13 is a second end 142. One end of the flap assembly 20 is slidably sealed to the first end 141; the flap assembly 20 moves axially and causes the other end of the flap assembly 20 to control the opening of the second end 142.

When the pressure reduction valve 100 is connected to a delivery line requiring pressure reduction, the adjustment assembly 30 is configured to move the valve flap assembly 20 toward the bottom of the valve body assembly 10, so that the end of the communication chamber 14 relatively close to the outlet 13 is opened. The flap assembly 20 is in a floating state, and the pressure of the fluid at the inlet 12 and the outlet 13 on the flap assembly 20 and the pressure of the adjusting assembly 30 on the flap assembly 20 form a dynamic balance. As the pressure at the outlet 13 increases, the outlet 13 gradually moves the flap assembly 20 toward the adjustment assembly 30 until the flap assembly 20 is again held against the second end 142 of the communication chamber 14. At this point, the outlet 13 pressure reaches a preset value.

In one embodiment, the valve body assembly 10 is a split body. The arrangement is such that the flap assembly 20 and the adjustment assembly 30 described above can be easily installed into the valve body assembly 10.

In one embodiment, the valve body assembly 10 further defines a pressure regulating chamber 16. The pressure regulating cavity 16 is arranged between the pressure regulating port 15 and the communication cavity 14, and the pressure regulating cavity 16 and the communication cavity 14 are in sliding seal through the valve clack assembly 20. The pressure regulating chamber 16 is used to mount the regulating assembly 30. The adjustment assembly 30 includes a pressure adjustment spring 32 and an adjustment member 31. One end of the pressure regulating spring 32 abuts against the valve clack assembly 20, and the other end abuts against the regulating piece 31; the adjuster 31 is provided at the position of the pressure adjusting port 15 and is movable in the axial direction of the valve body assembly 10. The pressure regulating spring 32 is used for regulating the pressure against the valve clack assembly 20. The adjusting member 31 is used for adjusting the position of the pressure adjusting spring 32 away from one end of the valve flap assembly 20, and can further change the compression degree of the pressure adjusting spring 32. The adjusting member 31 presses against the pressure adjusting spring 32 by an external force, so that the valve flap assembly 20 connected to the pressure adjusting spring 32 moves toward the bottom of the valve body assembly 10, thereby causing the valve flap assembly 20 to open the communication chamber 14.

In this embodiment, the diameter of the pressure regulating port 15 and the inner diameter of the pressure regulating chamber 16 are adapted to the radial dimensions of the regulating member 31 and the pressure regulating spring 32, thereby facilitating the assembly, disassembly, maintenance and repair of the regulating assembly 30 of the pressure reducing valve 100.

In particular, the adjustment member 31 is an adjustment screw. The adjusting screw is screwed to the valve body assembly 10, and one end of the adjusting screw abuts against the pressure regulating spring 32. The adjustment screw is used to adjust the position and degree of compression of the pressure adjustment spring 32. The adjusting screw rotates along the threaded track of the valve body assembly 10 and moves along the axial direction of the valve body assembly 10, thereby driving one end of the pressure regulating spring 32 to move and deform. Preferably, the end surface of the adjusting screw, which is far away from the pressure regulating spring 32, is provided with an adjusting hole (not numbered). The adjustment hole is a hexagon socket hole so that the hexagon wrench can conveniently penetrate the adjustment hole and adjust the pressure of the pressure adjusting spring 32 through the adjusting screw. So set up, adjusting screw's regulation convenient operation is simple, and the pressure regulating process is accurate reliable. It will be appreciated that in other embodiments, the adjustment aperture may be provided in other shapes.

In one embodiment, the pressure regulating port 15 is provided with an end cap (not numbered) to prevent foreign particulate dust from entering the pressure reducing valve 100. The end cover is used for covering the pressure regulating port 15 to prevent foreign matters from falling into the pressure regulating cavity 16. So configured, the assembly, disassembly, maintenance and service of the adjustment assembly 30 of the pressure relief valve 100 is facilitated.

In one embodiment, the valve body assembly 10 defines a bypass chamber 17 located relatively near the outlet 13. The bypass chamber 17 is used for pressure gauge and timely testing the fluid pressure at the outlet 13. When the pressure gauge is not connected, the bypass chamber 17 is sealed by the first plug 171. Preferably, the first plug 171 is provided at its outer periphery with a sealing element 172. The sealing member 172 serves to reinforce the sealing effect between the first stopper 171 and the inner wall of the bypass chamber 17 to prevent fluid leakage.

Referring also to fig. 3-6, fig. 3 is an enlarged schematic view of the pressure reducing valve 100 of fig. 1 at a; FIG. 4 is a schematic cross-sectional view of the first flap 21 of the pressure relief valve 100 of FIG. 1; FIG. 5 is a schematic cross-sectional view of the second lobe 22 of the pressure relief valve 100 of FIG. 1; fig. 6 is a schematic view of the second valve flap 22 of fig. 5 from another perspective.

The flap assembly 20 includes a first flap 21 and a second flap 22. The first valve flap 21 and the second valve flap 22 are respectively installed in the communication chamber 14 in sequence along the axis 11 of the valve body assembly 10, and are fixed to each other. The first valve flap 21 penetrates through the communication cavity 14 and slidably seals the first end 141 of the communication cavity 14; and a portion of the first valve flap 21 protrudes out of the communication chamber 14 and abuts against the pressure regulating spring 32. The second valve flap 22 is connected to one end of the first valve flap 21 away from the pressure regulating spring 32; and the second valve flap 22 is disposed outside the communication chamber 14 and slidably connected within the valve body assembly 10. The first valve flap 21 is used for slidably sealing the first end 141 of the communication chamber 14 and is capable of cooperating with the second valve flap 22 and controlling the opening of the second end 142 of the communication chamber 14. The sliding fit between the second valve flap 22 and the valve body assembly 10 can provide some resistance to movement of the valve body assembly 10 assembly in the axial direction.

When the adjustment assembly 30 depresses the first valve flap 21, the first valve flap 21 carries the second valve flap 22 towards the bottom of the valve body assembly 10 until the second end 142 of the communication chamber 14 is opened. The inlet 12 and outlet 13 of the valve body assembly 10 have opposing forces on the pressure of the first and second flaps 21 and 22, such that the first and second flaps 21 and 22 are in a floating equilibrium state. With such an arrangement, the opening degree of the second end 142 of the communication chamber 14 is automatically adjusted by the adjusting component 30, so as to avoid the fluid from being turbulent due to the violent movement of the first valve flap 21 and the second valve flap 22.

As shown in fig. 4, the first valve flap 21 has a substantially T-shaped longitudinal section, and includes a first seal portion 211, a second seal portion 212, and a connection portion 213 connected in this order. The first sealing portion 211 is located at one end of the first valve flap 21 relatively close to the pressure regulating spring 32; the first sealing portion 211 extends out of the communication chamber 14, abuts against the pressure regulating spring 32, and is slidably connected to the inner wall of the pressure regulating chamber 16. The second seal 212 is substantially in the middle of the first flap 21; and the second sealing portion 212 is disposed in the communicating chamber 14 and forms a sliding connection with the inner wall of the communicating chamber 14. The connection portion 213 is located at an end of the first valve flap 21 relatively distant from the pressure regulating spring 32. The first sealing part 211 and the second sealing part 212 are respectively in sliding connection with the inner wall of the valve body assembly 10 and seal the first end 141 of the communication cavity 14; the connecting portion 213 is used to connect the first valve flap 21 and the second valve flap 22, and can abut against the end surface of the second end 142. When the first valve flap 21 moves in the axial direction, the first and second sealing portions 211 and 212 are in sealing connection with the valve body assembly 10, and fluid flows from the inlet 12 to the outlet 13 through a gap between the connecting portion 213 and the inner wall of the second end 142.

The first sealing portion 211 is substantially disc-shaped, and the radial dimension of the first sealing portion 211 is adapted to the inner diameter of the pressure regulating chamber 16. The first sealing portion 211 is adapted to engage an inner wall of the pressure regulating chamber 16 and seal the first end 141 of the communication chamber 14. Specifically, a first seal groove 2112 for mounting a first seal 2111 is opened on the peripheral side of the first seal portion 211. Correspondingly, the first seal 2111 is substantially annular. When first seal 2111 is disposed within first seal groove 2112, first seal 2111 creates a force that contracts in a radial direction. The first sealing portion 211 abuts against the inner wall of the pressure regulating chamber 16 through a first sealing member 2111, and forms a sliding seal with the inner wall of the pressure regulating chamber 16. The first sealing member 2111 is made of a material having elasticity, such as rubber or silicone. With the arrangement, the first sealing portion 211 is good in sealing effect, and the production cost is low. It is understood that the first sealing groove 2112 may be opened on the inner wall of the pressure regulating chamber 16, as long as the first sealing member 2111 can be installed and the first sealing portion 211 and the inner wall of the pressure regulating chamber 16 can be in sliding sealing.

In one embodiment, the abutment portion 2113 is formed by axially projecting the first seal portion 211 relatively close to the end of the pressure regulating spring 32. The contact portion 2113 is provided to penetrate the pressure regulating spring 32 and bring the pressure regulating spring 32 into contact with the end surface of the first seal portion 211. With this arrangement, the biasing force of the pressure regulating spring 32 against the first seal portion 211 is less likely to be deflected. It is understood that, if the deflection of the pressure regulating spring 32 is not considered, the contact portion 2113 can be omitted accordingly, and the pressure regulating spring 32 can directly contact the end surface of the first seal portion 211.

In one embodiment, the first seal portion 211 is recessed relative to an end surface distal from the pressure regulating spring 32 to form a recess 2114. The walls of the recess 2114 are adapted to abut the inner wall of the connecting chamber. In the present embodiment, the pressure-regulating chamber 16 communicates with the outlet 13, and the first sealing portion 211 also serves to separate the pressure-regulating chamber 16 from the outlet 13. The fluid pressure at the outlet 13 can act directly on the bottom wall of the recess 2114 of the first seal portion 211 and provide a force to the first seal portion 211 opposing the pressure regulating spring 32.

In one embodiment, the second sealing portion 212 is substantially cylindrical and has an outer diameter smaller than the first sealing portion 211. A second seal groove 2122 for mounting a second seal 2121 is formed on the peripheral side of the second seal portion 212. The second sealing member 2121 abuts against the inner wall of the communication chamber 14 and forms a sliding seal. By such arrangement, the fluid can be prevented from flowing to the pressure regulating cavity 16, so that the pressure regulating spring 32 and the regulating piece 31 are prevented from rusting due to corrosion of the fluid, and the pressure regulating spring 32 and the regulating piece 31 are protected.

In the present embodiment, the provision of two sealing portions can increase the sliding sealing effect of the first valve flap 21 against the first end 141 of the communication chamber 14, but the sealing portions also further increase the resistance to movement of the first valve flap 21. It is understood that in other embodiments, the sealing portion may be increased or decreased according to actual conditions.

In one embodiment, the connecting portion 213 has a smaller radial dimension than the second sealing portion 212, and the outer circumference of the connecting portion 213 is threaded. The connecting portion 213 is for threaded connection with the second valve flap 22. The connecting portion 213 extends in the radial direction and forms an extension portion 2131. When the connection portion 213 is screwed to the second valve flap 22, a gasket 23 is interposed between the extension portion 2131 and the second valve flap 22. The gasket 23 can be used to abut against the end face of the communication chamber 14. When the first valve flap 21 moves toward the adjusting assembly 30, the gap between the connecting portion 213 and the second end 142 of the communication chamber 14 becomes smaller, so that the gasket 23 can be pressed and abutted against the end surface of the second end 142, thereby achieving the purpose of sealing the second end 142. The gasket 23 is made of a material having elasticity such as rubber.

In one embodiment, as shown in fig. 5, the second flap 22 is substantially cylindrical and is mounted to the bottom of the valve body assembly 10 and is slidably connected to the inner wall of the valve body assembly 10. One end of the second valve flap 22 facing the first valve flap 21 is a mounting portion 221, and a gasket groove 2211 is opened in an end surface of the mounting portion 221. The gasket groove 2211 is used for mounting the gasket 23. The bottom wall of the gasket groove 2211 is further opened with a screw groove 2212 in the axial direction. The thread groove 2212 can be used for screwing with the connection portion 213 of the first valve flap 21. It is understood that, in other embodiments, the thread groove 2212 and the gasket groove 2211 may also be opened on the first valve flap 21, and a thread is provided on the outer circumference of the second valve flap 22, as long as the second valve flap 22 and the first valve flap 21 can be fixed to each other; the first valve flap 21 and the second valve flap 22 can also be fixed to each other by means of snap-fit or the like.

In one embodiment, the second valve flap 22 is radially contracted and forms the sliding connection 222 with respect to a position away from the first valve flap 21. A third seal groove 2222 for mounting a third seal 2221 is also opened on the circumferential side of the slide connecting portion 222. The third seal 2221 is disposed in a manner similar to the first seal 2111 or the second seal 2121, and is not described in detail herein. Preferably, the number of the third seals 2221 is two, and the two third seals 2221 are arranged in parallel in the axial direction of the spool. The arrangement is such that the sliding connection strength between the second valve flap 22 and the valve body assembly 10 is excellent.

In one embodiment, the mounting portion 221 and the sliding connection portion 222 have an annular step surface 2223 therebetween, and the step surface 2223 and the gasket 23 are located on opposite sides of the mounting portion 221. Since the second land 22 is located outside the communicating chamber 14 and the step surface 2223 is located in the inner chamber of the valve body assembly 10 communicating with the outlet 13, the fluid pressure of the outlet 13 can directly act on the step surface 2223 and provide a counter force against the pressure of the gasket 23.

If the pressure before the valve fluctuates in the existing pressure reducing valve, the pressure after the valve of the pressure reducing valve is also affected correspondingly, and particularly when the pressure before the valve of the pressure reducing valve is increased sharply, the pressure after the valve of the pressure reducing valve is increased instantly, so that the risk of tube explosion is easily caused.

In order to avoid the above problem, the pressure reducing valve 100 further has a balance chamber 40 and a connecting passage 41 communicating with the balance chamber 40 and the inlet 12. The balance chamber 40 can be used to respond and relieve the pre-valve pressure in a timely manner so that the post-valve pressure of the pressure relief valve 100 does not burst, thereby avoiding the risk of a tube burst.

Specifically, the balancing chamber 40 is formed between the second flap 22 and the bottom of the valve body assembly 10. The balance chamber 40 is adapted to respond in time to the fluid pressure at the inlet 12. The first valve flap 21 and the second valve flap 22 are respectively provided with a first passage 411 and a second passage 412 which are communicated with each other. The first passage 411 and the second passage 412 are connected to each other and form a connection passage 41. When the first valve flap 21 and the second valve flap 22 do not open the second end 142 of the communication chamber 14, the fluid in the inlet 12 can enter the balance chamber 40 through the connecting channel 41, and the fluid in the balance chamber 40 can act on the end surface of the sliding connecting part 222 of the second valve flap 22 and form an upward jacking force.

The first channel 411 has a substantially T-shaped longitudinal cross section, and is opened at the connection between the connection portion 213 and the second sealing portion 212 and at the connection portion 213, and penetrates through the connection portion 213. Second passage 412 extends through second valve flap 22 and is in communication with and aligned with first passage 411. Fluid enters through inlet 12 and enters balance chamber 40 via first passage 411 and second passage 412. It is understood that in other embodiments, the first passage 411 and the second passage 412 may be correspondingly arranged according to actual requirements, as long as the communication between the inlet 12 and the balance cavity 40 is realized.

In one embodiment, in order to facilitate the fixing of the second valve flap 22 to the first valve flap 21, the end of the second valve flap 22 relatively far from the first valve flap 21 is further provided with a wrenching portion 223. The wrenching portion 223 is located at one end of the second valve flap 22 far away from the first valve flap 21, and the wrenching portion 223 has an inner hexagonal structure. The end surface of the wrenching portion 223 is formed with a hexagonal socket 2231. The hexagonal socket 2231 communicates with the second passage 412. The arrangement is such that a wrench matched with the first valve clack can extend into the first valve clack 21 and fix the second valve clack 22 and the first valve clack. Further, the hexagonal socket 2231 of the wrenching portion 223 can form part of the balance cavity 40 such that the balance cavity 40 has a larger space for receiving fluid.

In the present embodiment, the gasket groove 2211, the hexagon socket 2231, and the thread groove 2212 for connecting the first valve flap 21 penetrate each other and form the second passage 412.

It is understood that in other embodiments, the screwing portion 223 may be configured as an external hexagonal screwing portion 223 as long as it is possible to achieve the convenience of screwing the second valve flap 22 and the first valve flap 21 to each other by an external tool; if the outer hexagonal wrenching portion 223 is provided, the location of the wrenching portion 223 may be provided at any outer peripheral section of the second valve flap 22. The hexagonal socket 2231 may be provided as a bore of other shapes as long as it is capable of mating with an external tool and tightening the second valve flap 22.

Referring to fig. 7, fig. 7 is a schematic cross-sectional view of the second plug 19 of the pressure reducing valve 100 shown in fig. 1.

In one embodiment, as shown in fig. 2, 3 and 7, the valve body assembly 10 includes a valve body 18 and a second plug 19. The valve body 18 is detachably connected with the second plug 19. The valve body 18 defines the valve cavity, inlet, outlet and opening described above, and the valve cavity is fitted with a valve flap assembly 20. A port (not numbered) is formed in the valve body 18 relatively near the second valve flap 22 and communicates with the balance chamber 40. The second plug 19 is provided at the position of the port and can abut against the sliding connection portion 222 of the second valve 22. The valve body 18 is used for installing elements such as a valve clack assembly 20 and the like; the second plug 19 is used to seal the port of the balance cavity 40. The inner wall of the second plug 19 is connected with the sliding connection part 222 of the second valve flap 22 in a sliding and sealing manner, and the space formed by the two sealing connections is the balance cavity 40. With this arrangement, the second valve flap 22 can be easily detached.

In one embodiment, the valve body 18 is threadedly connected to the second plug 19. So configured, the second plug 19 can be easily detached or attached to the valve body 18.

The second plug 19 is generally cylindrical with one end recessed to form a portion of the balancing chamber 40. The outer circumference of the second plug 19 extends in the radial direction and forms a sealing step 191, and the sealing step 191 and the end surface of the port of the valve body 18 are abutted against each other.

Preferably, a sealing ring 192 is disposed between the second plug 19 and the valve body 18 to further increase the sealing performance between the two.

The pressure reducing valve 100 mainly forms two opposite acting forces between the first valve flap 21 and the second valve flap 22 by the fluid pressure of the inlet 12, the fluid pressure of the outlet 13 and the adjusting assembly 30, so that the valve flap assembly 20 can slide along the axial direction along with the pressure change of the inlet 12 and the outlet 13, and further the opening degree of the second end 142 of the communication cavity 14 is controlled. Wherein, as shown in fig. 1, the downward force comprises: the force of the inlet 12 fluid against the gasket 23 and the force of the adjustment assembly 30 against the first seal 211. The upward forces include: the force of the fluid in inlet port 12 against the end face of second seal portion 212, the force of the fluid in balance chamber 40 against the end face of second valve flap 22, and the force of the fluid in outlet port 13 against the bottom wall of recess 2114 in first seal portion 211. The acting force and the corresponding acting area form different pressure differences, so that the valve core assembly can move along the axial direction correspondingly.

The adjustment process of the pressure reducing valve 100 is described in detail below:

the pressure regulating spring 32 is pressed down through the regulating screw, and the first valve clack 21 moves towards the direction far away from the regulating assembly 30; the first valve flap 21 and the gasket 23 are separated from the end surface of the second end 142; fluid from inlet 12 now exits through second end 142 and outlet 13. When the pressure of the outlet 13 gradually rises, the fluid of the outlet 13 acts on the first sealing portion 211 and the step portion communicating with the pressure regulating chamber 16, so that the first valve flap 21 and the second valve flap 22 gradually overcome the elastic force of the pressure regulating spring 32, and the opening degree of the second end 142 is gradually reduced, and when the pressure of the outlet 13 reaches a preset value, the first valve flap 21 and the second valve flap 22 gradually abut against the end surface of the second end 142 again through the gasket 23.

When the pre-valve pressure increases sharply, the fluid enters the balance chamber 40 through the connecting passage 41 and exerts an upward jacking force on the end surface of the second valve flap 22 relatively close to the bottom of the valve body assembly 10, thereby correspondingly reducing the opening of the second end 142 so that the pressure of the pressure reducing valve 100 with the sudden increase in pre-valve pressure is not directly fed back to the outlet 13, thereby avoiding the risk of a post-valve blowout.

An embodiment of the utility model provides a pressure reducing valve, through setting up balanced chamber and communicating in balanced chamber and imported interface channel for balanced chamber can be used for in time responding and alleviate the pressure before the valve, so that the pressure can not violently increase behind the valve of pressure reducing valve, thereby avoids the risk of tube explosion.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A pressure reducing valve comprises a valve body assembly (10), a valve clack assembly (20) and an adjusting assembly (30), wherein the valve body assembly (10) is provided with an inlet (12), an outlet (13), a communication cavity (14) and a pressure regulating opening (15), the inlet (12) is communicated with the outlet (13) through the communication cavity (14), the communication cavity (14) is communicated with the pressure regulating opening (15), the valve clack assembly (20) is arranged in the communication cavity (14) and controls the opening degree of the outlet (13), the adjusting assembly (30) is used for adjusting pressure, the adjusting assembly (30) is arranged in the pressure regulating opening (15) and can act on the valve clack assembly (20),

the valve is characterized in that one end of the valve flap assembly (20) is in sliding seal with a first end (141) of the communication cavity (14) under the action of the adjusting assembly (30), and the other end of the valve flap assembly (20) is arranged in the communication cavity (14) and can control the opening degree between a second end (142) of the communication cavity (14) and the outlet (13); a balance cavity (40) is formed between the valve flap component (20) and the valve body component (10), a connecting channel (41) communicated with the inlet (12) and the balance cavity (40) is formed in the valve flap component (20), and when the second end (142) of the communicating cavity (14) is sealed, the valve flap component (20) can balance the pressure between the inlet (12) and the balance cavity (40) through the connecting channel (41).

2. The pressure-reducing valve according to claim 1, wherein the valve flap assembly (20) comprises a first valve flap (21) and a second valve flap (22), the first valve flap (21) being disposed within the communication chamber (14) and slidably sealing a first end (141) of the communication chamber (14); one end of the first valve flap (21) extends out of the communication cavity (14) and abuts against the adjusting component (30), and the other end of the first valve flap is connected with the second valve flap (22) and controls the opening degree between the second end (142) of the communication cavity (14) and the outlet (13);

the second valve clack (22) and the valve body assembly (10) form the balance cavity (40) therebetween;

the first valve clack (21) and the second valve clack (22) are respectively provided with a first channel (411) and a second channel (412) which are communicated with each other, the second channel (412) is communicated with the balance cavity (40), and the first channel (411) and the second channel (412) are spliced to form the connecting channel (41).

3. The pressure reducing valve according to claim 2, wherein the valve body assembly (10) is further provided with a pressure regulating cavity (16), the pressure regulating cavity (16) is positioned between the pressure regulating port (15) and the communicating cavity (14), and the pressure regulating cavity (16) is communicated with the outlet (13); the first valve flap (21) comprises a first sealing part (211), a second sealing part (212) and a connecting part (213) which are sequentially connected, the first sealing part (211) is abutted to the adjusting assembly (30), the first sealing part (211) extends out of the first end (141) of the communicating cavity (14), and the first sealing part and the inner wall of the valve body assembly (10) are in sliding seal with the connecting part of the outlet (13) and the pressure adjusting cavity (16);

the second sealing part (212) is positioned in the communication cavity (14), and the second sealing part (212) is abutted against the inner wall of the communication cavity (14) and seals the first end (141) of the communication cavity (14);

the connecting portion (213) is located at a second end (142) of the communication chamber (14) and is capable of abutting against an end surface of the second end (142).

4. The pressure reducing valve according to claim 3, wherein the second valve flap (22) comprises a mounting portion (221) and a sliding connection portion (222) which are connected with each other, the mounting portion (221) is arranged at the connection portion (213) of the first valve flap (21), a gasket (23) is arranged between the mounting portion (221) and the connection portion (213), a gasket groove (2211) is formed in the end face, facing the first valve flap (21), of the mounting portion (221), the gasket (23) is fixedly connected to the connection portion (213) and embedded in the gasket groove (2211), and the gasket (23) can be abutted against the end face of the second end (142) of the communication cavity under the action of the first valve flap (21);

the sliding connection part (222) and the valve body assembly (10) form the balance cavity (40), and the sliding connection part (222) seals the balance cavity (40) in a sliding mode.

5. The pressure reducing valve according to claim 4, wherein a third seal (2221) is provided between the sliding connection portion (222) and the valve body assembly (10), and the sliding connection portion (222) abuts against and seals the balance chamber (40) through the third seal (2221).

6. The pressure-reducing valve according to claim 5, wherein the number of the third seals (2221) is two, and the third seals (2221) are arranged in parallel in the direction of the axis (11) of the valve flap assembly (20).

7. The pressure-reducing valve according to claim 4, wherein the second valve flap (22) further comprises a wrenching portion (223), the wrenching portion (223) being provided at an end surface of the sliding connection portion (222) relatively distant from the mounting portion (221) and being for an external tool to apply force to the second valve flap (22).

8. The pressure reducing valve according to claim 1, wherein the valve body assembly (10) comprises a valve body (18) and a second plug (19), the valve body (18) is provided with the valve clack assembly (20), a port is formed on one side of the valve body (18) close to the valve clack assembly (20), the port is communicated with the balance cavity (40), the second plug (19) is detachably connected to the valve body (18) and can seal the port, and the balance cavity (40) is formed between the second plug (19) and the valve clack assembly (20).

9. The pressure reducing valve according to claim 1, wherein the adjusting assembly (30) comprises a pressure adjusting spring (32) and an adjusting member (31), and both ends of the pressure adjusting spring (32) are respectively abutted against the valve flap assembly (20) and the adjusting member (31); the adjusting piece (31) is arranged at the position of the pressure adjusting opening (15) and can move along the axial direction of the valve body assembly (10).

10. The pressure reducing valve according to claim 1, further comprising a plug, wherein the valve body assembly (10) is further provided with a bypass cavity (17), the bypass cavity (17) is communicated with the outlet (13) and the outside, and the plug seals an opening of the bypass cavity (17).

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