CN114321457A - Reliable-sealing pilot safety valve - Google Patents

Abstract

The application relates to a reliable-sealing pilot operated safety valve main valve, which relates to the field of engineering elements and comprises a valve body, wherein a mounting ring seat is integrally formed on the outer side wall of one end of the valve body, the other end of the valve body is fixedly connected with a valve cover through a bolt, the mounting ring seat is mutually vertical to the axis of the valve cover, a cavity is arranged in the valve body, an inlet pipeline is arranged at one end of the valve body close to the mounting ring seat, a pressure relief pipeline is arranged at the end of the valve body opposite to the mounting ring seat, the valve body is provided with a control valve for controlling the opening and closing of the pressure relief pipeline, the end, opposite to the valve cover, of the mounting ring seat is provided with an outlet pipeline, the inlet pipeline, the pressure relief pipeline and the outlet pipeline are communicated with the cavity, the cavity is connected with a guide sleeve in a clamping manner, the guide sleeve and the valve cover are coaxially arranged, a valve seat is fixedly connected in the valve body and is located at one end, far away from the valve cover, of the valve body, and a regulating assembly which is matched with the valve seat and used for sealing the outlet pipeline is arranged in the guide sleeve. This application has the effect that improves system's pipeline security.

Description

Reliable-sealing pilot safety valve

Technical Field

The application relates to the field of engineering elements, in particular to a pilot operated safety valve main valve with reliable sealing.

Background

The pilot operated safety valve is a hydraulic device with unloading, safety and non-return functions, and is widely applied to nuclear power, thermal power, military industry and other industries, and the performance of the pilot operated safety valve directly influences the performance of the whole system pipeline. When the pilot operated relief valve works, a medium enters the pilot operated relief valve, and when the pressure in the pilot operated relief valve is too high, the too high pressure can cause adverse effects on a system pipeline.

The pressure relief speed of the pilot operated safety valve is low, so that abnormal pressure in a system pipeline cannot be timely relieved, and the safety of the system pipeline is adversely affected.

Disclosure of Invention

In order to improve the safety of system's pipeline, this application provides a reliable seal's pilot operated relief valve main valve.

The application provides a sealed reliable guide's formula relief valve main valve adopts following technical scheme:

a reliable-sealing pilot operated safety valve main valve comprises a valve body, wherein a mounting ring seat is integrally formed on the outer side wall of one end of the valve body, a valve cover is fixedly connected to the other end of the valve body through a bolt, the axis of the mounting ring seat is perpendicular to the axis of the valve cover, a cavity is formed in the valve body, an inlet pipeline is formed in one end, close to the mounting ring seat, of the valve body, an inlet branch communicated with the cavity is formed in the inner side wall of the inlet pipeline, a pressure relief pipeline is formed in the end, opposite to the mounting ring seat, of the valve body, a control valve for controlling the opening and closing of the pressure relief pipeline is arranged on the valve body, an outlet pipeline is formed in the end, opposite to the valve cover, of the mounting ring seat, of the valve body, the inlet pipeline, the pressure relief pipeline and the outlet pipeline are communicated with the cavity, and a guide sleeve is clamped in the cavity, the guide sleeve with the valve gap coaxial line sets up, the joint has a disk seat in the valve body, the disk seat is located the valve body is kept away from the one end of valve gap, be equipped with in the guide sleeve and carry out confined adjusting part with the disk seat cooperation to outlet line.

By adopting the technical scheme, when the cavity is abnormally pressurized, the control valve controls the pressure relief pipeline to be opened, the medium in the cavity close to the pressure relief pipeline flows out of the valve body along the pressure relief pipeline, the medium pressure in the cavity close to the inlet pipeline is higher than the medium pressure in the cavity close to the pressure relief pipeline, the medium pushes the adjusting assembly to move, so that the adjusting assembly is disengaged from the valve seat, and the outlet pipeline is opened; at the moment, the medium at the inlet pipeline in the chamber can be quickly discharged out of the valve body along the outlet pipeline, so that the pressure of the medium in the valve body is reduced.

When the pressure relief is finished, the control valve controls the pressure relief pipeline to be closed, the medium flows to the pressure relief pipeline from the inlet branch along with the continuous flowing of the medium into the cavity along the inlet pipeline, and meanwhile the medium flowing into the cavity flows to the pressure relief pipeline along a gap between the valve body and the adjusting assembly; when the pressure of the chamber close to the inlet pipeline is equal to the pressure of the chamber close to the pressure relief pipeline, the contact area between one side of the adjusting component close to the pressure relief pipeline and the medium is larger than that between one side of the adjusting component close to the valve seat and the medium, so that the pressure applied to one side of the adjusting component close to the pressure relief pipeline is larger than that applied to one side of the adjusting component close to the valve seat.

The adjusting assembly moves towards the direction close to the valve seat under the action of pressure until the adjusting assembly is matched with the valve seat to seal the outlet pipeline, and at the moment, the medium does not flow out along the outlet pipeline any more; through setting up adjusting part and outlet pipeline, make the medium in the valve body discharge outside the valve body that can be quick to make system's pipeline can normally work, improved system's pipeline's security.

Optionally, the adjusting part includes sliding connection's piston in the uide bushing, the piston includes the body of rod and the cover body, the cover body is located the body of rod is kept away from the one end of valve gap, a spring has been cup jointed on the body of rod, the spring is kept away from the one end of the cover body with the valve gap contact, the spring is in the compression state, the cover body is kept away from the one end joint of the body of rod has a valve clack seat, be equipped with the mounting in the valve clack seat, there is a valve clack through the mounting joint in the valve clack seat, the valve clack with the butt between the disk seat.

By adopting the technical scheme, when the medium pressure of the chamber close to the inlet pipeline is higher than that of the chamber close to the pressure relief pipeline, the medium pushes the valve clack, the valve clack seat and the piston to move towards the direction close to the valve cover, so that the valve clack is separated from the valve seat; at the moment, the outlet pipeline is opened, the medium in the cavity can be quickly discharged out of the valve body along the outlet pipeline, and the piston moves and further compresses the spring.

When the pressure relief is finished, the control valve controls the pressure relief pipeline to be closed; the medium flows to the pressure relief pipeline from the inlet branch along the inlet pipeline continuously along the chamber, meanwhile, the medium in the chamber flows to the position, close to the pressure relief pipeline, of the chamber along gaps among the valve clack, the valve clack seat, the piston, the guide sleeve and the inner wall of the chamber, and finally the medium at the position, close to the pressure relief pipeline, of the chamber flows to the pressure relief pipeline.

When the pressure of the chamber close to the inlet pipeline is equal to the pressure of the chamber close to the pressure relief pipeline, the contact area of the piston and the medium is larger than the contact area of the valve clack and the medium, so that the pressure borne by the piston is larger than the pressure borne by the valve clack, and the piston pushes the valve clack seat and the valve clack to move towards the direction close to the valve seat under the action of the pressure until the valve clack is abutted against the valve seat; the valve clack is matched with the valve seat to seal the outlet pipeline, so that the medium in the cavity can not flow out along the outlet pipeline.

In the process that the piston moves towards the valve seat, the spring recovers deformation and pushes the piston, the valve clack seat and the valve clack to move better; when the valve clack is abutted on the valve seat, the spring is still in a compressed state, so that the valve clack is better matched with the valve seat.

Optionally, the fixed slot has been seted up on the inside wall of valve clack seat, the mounting includes the stop collar of joint in the fixed slot, on the lateral wall of valve clack with the position that the stop collar corresponds has been seted up and is annular fixed annular, solid fixed ring has been pegged graft in the fixed annular, gu fixed ring's lateral wall with the inside wall contact of stop collar, gu fixed ring's external diameter is greater than the valve clack is located the external diameter of stop collar one end, gu fixed ring is close to the terminal surface of disk seat with the cell wall contact of fixed slot.

Through adopting above-mentioned technical scheme, solid fixed ring and stop collar and fixed slot cooperation are fixed between valve clack and the valve clack seat, reduce the possibility that the valve clack breaks away from the valve clack seat.

Optionally, the guide sleeve is close to one end of the valve cover is fixedly connected with a spring seat and a limiting ring through bolts, the limiting ring is located on one side, away from the valve cover, of the spring seat, an adjusting pad is arranged between the spring seat and the limiting ring, the adjusting pad is in contact with the spring seat and the limiting ring, and one end of the spring close to the valve cover is abutted to the spring seat.

Through adopting above-mentioned technical scheme, reduce spring and valve gap direct contact and lead to the valve gap because of the effort of spring to the possibility of keeping away from the direction removal of valve body, and the adjusting pad blocks the gap between hindering and moving ring and the spring holder to the condition of medium emergence leakage in the reduction chamber.

Optionally, a surfacing layer is welded at a position where the valve flap contacts the valve flap seat.

Through adopting above-mentioned technical scheme, the surfacing layer disperses the stress of valve clack and valve clack seat contact position, has reduced the contact department of valve clack and valve clack seat and has taken place the possibility of fracture because of stress concentration, has reduced the adverse effect that causes valve clack life.

Optionally, a matching groove matched with the surfacing layer is formed in the valve flap seat.

Through adopting above-mentioned technical scheme, cooperation groove and the cooperation of surfacing layer reduce the possibility that clamping stagnation appears in surfacing layer and valve clack seat, and the cooperation groove is spacing to the valve clack, makes between valve clack seat and the valve clack complex better to can be better seal the outlet pipeline.

Optionally, a blocking ring is clamped on the inner side wall of one end, close to the valve cover, of the valve body, the blocking ring is located on one side, close to the spring seat, of the valve cover, the blocking ring protrudes out of the inner side wall of the valve body, and the spring seat is abutted to the blocking ring.

Through adopting above-mentioned technical scheme, spring compression makes the spring holder have to the trend of being close to valve gap direction motion, hinders the ring that moves and carries on spacingly to the removal of spring holder, has reduced the possibility that the spring holder moved to the direction that is close to the valve gap to the cooperation that has reduced valve gap and valve body produces adverse effect's the condition.

Optionally, a plurality of grooves are formed in the outer side wall of the sleeve body.

Through adopting above-mentioned technical scheme, make the area of contact between piston and the uide bushing as far as possible little to make the piston more smooth and easy when removing.

Optionally, the side wall of the valve flap near one end of the valve seat is a flow guide ring surface, and the flow guide ring surface is bent reversely near the axis of the valve flap.

By adopting the technical scheme, when the outlet pipeline is opened, the guide ring guides the medium in the cavity, so that the medium in the cavity can better flow into the outlet pipeline along the guide ring surface, and finally is discharged out of the valve body along the outlet pipeline.

Optionally, a distance between one side of the chamber close to the valve cover and the inlet pipeline is smaller than a distance between one side of the chamber close to the valve seat and the inlet pipeline.

Through adopting above-mentioned technical scheme, make a large amount of media can flow to one side that the cavity is close to the inlet pipeline along the inlet pipeline, a large amount of media impact adjusting part, make adjusting part change and remove the cooperation with the disk seat to make outlet pipeline open.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the valve body, the cavity, the inlet pipeline, the pressure relief pipeline, the outlet pipeline, the guide sleeve, the valve seat and the adjusting assembly, the adjusting assembly is matched with the valve seat to enable a medium in the cavity to be rapidly discharged out of the valve body along the outlet pipeline, so that the safety of a system pipeline is improved;

2. the fixing ring, the limiting sleeve and the fixing groove are arranged, and the fixing ring is matched with the limiting sleeve and the fixing groove to fix the valve clack and the valve clack seat, so that the possibility that the valve clack is separated from the valve clack seat is reduced;

3. through setting up the recess, make the area of contact between piston and the uide bushing as far as possible little to make the piston more smooth and easy when removing.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a main valve of a pilot operated safety valve according to an embodiment of the present application.

Fig. 2 is an exploded view of the main valve portion structure of the pilot operated safety valve according to the embodiment of the present application.

Fig. 3 is an exploded view of the main valve portion structure of the pilot operated safety valve according to the embodiment of the present application.

Fig. 4 is a sectional view showing the entire structure of a main valve of a pilot operated safety valve according to an embodiment of the present application.

FIG. 5 is a cross-sectional view of an embodiment of the present application showing the connection relationship of the piston, the valve flap seat and the valve flap.

Description of reference numerals: 1. a valve body; 11. an inlet line; 12. a clamping groove; 13. mounting grooves; 14. an outlet line; 15. a chamber; 16. an inlet branch; 17. a pressure relief pipeline; 18. a sealing groove; 2. installing a ring seat; 3. a valve cover; 31. a boss; 32. a seal ring; 33. a resistance moving ring; 4. a valve seat; 5. an adjustment assembly; 51. a guide sleeve; 52. a piston; 521. a rod body; 522. a sleeve body; 5221. abutting against the groove; 5222. inserting grooves; 5223. a groove; 5224. an annular groove; 523. tightening the screw; 53. a spring; 54. a spring seat; 55. a limiting ring; 56. a valve flap seat; 561. inserting ring grooves; 562. fixing grooves; 563. a mating groove; 57. a fixing member; 571. a limiting sleeve; 572. a fixing ring; 58. a valve flap; 581. a fixed ring groove; 582. overlaying a welding layer; 6. and (7) installing holes.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a reliable-sealing pilot operated safety valve main valve. Referring to fig. 1 and 2, a pilot operated safety valve main valve with reliable sealing includes a valve body 1, and the valve body 1 is a four-way valve body 1. An annular mounting ring seat 2 is integrally formed on the side wall of one end of the valve body 1, and the mounting ring seat 2 and the corresponding end of the valve body 1 are coaxially arranged; one end of the valve body 1 is fixedly connected with a valve cover 3 through a bolt, the axis of the valve cover 3 is perpendicular to the axis of the mounting ring seat 2, and the valve cover 3 seals the corresponding end of the valve body 1.

Referring to fig. 1 and 3, an inlet pipeline 11 has been seted up on the valve body 1 is close to the terminal surface of mounting ring seat 2, and the axis of inlet pipeline 11 sets up with mounting ring seat 2 coaxial line, and mounting groove 13 has been seted up to the one end that valve body 1 is close to valve gap 3, and outlet pipeline 14 has been seted up to the one end that valve body 1 keeps away from valve gap 3, and the diameter of outlet pipeline 14 is greater than the diameter of inlet pipeline 11. The position that lies in between mounting groove 13 and the export pipeline 14 in the valve body 1 has seted up cavity 15, and cavity 15 has been kept away from and has been seted up joint groove 12 on the chamber wall of valve gap 3, and the diameter in joint groove 12 is greater than the diameter of export pipeline 14, and export pipeline 14, mounting groove 13 and joint groove 12 all set up with valve gap 3 coaxial line.

Referring to fig. 3 and 4, an inlet branch 16 is disposed on a side wall of the inlet pipeline 11, the inlet branch 16 is communicated with the inlet pipeline 11, a pressure relief pipeline 17 is disposed on an end surface of the valve body 1 away from the mounting ring seat 2, a control valve for controlling opening and closing of the pressure relief pipeline 17 is disposed outside the valve body 1, the control valve is not shown in the drawing, the inlet pipeline 11, the inlet branch 16, and the pressure relief pipeline 17 are all communicated with the cavity 15, and the inlet branch 16 and the pressure relief pipeline 17 are all communicated with the mounting groove 13. Be equipped with a disk seat 4 in the cavity 15, disk seat 4 joint is in joint groove 12 department, and disk seat 4 and outlet pipe 14 coaxial line set up, still is equipped with adjusting part 5 in the cavity 15, and adjusting part 5 and disk seat 4 cooperate to the switching of control outlet pipe 14.

When the main valve of the pilot-operated safety valve works, the control valve controls the pressure relief pipeline 17 to be closed, medium flows into the side, close to the valve seat 4, of the chamber 15 along the inlet pipeline 11 and fills the chamber 15, meanwhile, medium in the inlet branch 16 flows to the side, close to the pressure relief pipeline 17, of the chamber 15, and part of the medium flows to the position, close to the pressure relief pipeline 17, of the chamber 15 through the adjusting assembly 5 and a gap between the adjusting assembly 5 and the valve seat 4. The pressure in the chamber 15 near the inlet line 11 is now equal to the pressure in the chamber 15 near the pressure relief line 17.

Because the contact area between the position of the adjusting component 5 close to the pressure relief pipeline 17 and the medium is larger than the contact area between the position of the adjusting component 5 close to the valve seat 4 and the medium, the pressure applied to the position of the adjusting component 5 close to the pressure relief pipeline 17 is larger than the pressure applied to the position of the adjusting component 5 close to the valve seat 4, so that the medium pushes the adjusting component 5 to abut against the valve seat 4, and the adjusting component 5 is matched with the valve seat 4 to block the outlet pipeline 14.

When the pressure in the valve body 1 increases, the valve body 1 needs to be decompressed, the control valve firstly controls the decompression pipeline 17 to be opened, and at the moment, the medium at the position of the cavity 15 close to the decompression pipeline 17 is discharged out of the valve body 1 along the decompression pipeline 17, so that the medium pressure at the position of the cavity 15 close to the decompression pipeline 17 is smaller than the medium pressure at the position of the cavity 15 close to the inlet pipeline 11.

The medium that cavity 15 was close to disk seat 4 department promotes adjusting part 5 to the direction removal that is close to valve gap 3 in cavity 15 to make adjusting part 5 and disk seat 4 remove the cooperation, outlet pipeline 14 opens this moment, the medium in the cavity 15 flows out along outlet pipeline 14, outlet pipeline 14's diameter is greater than the diameter of inlet pipeline 11, thereby the outflow that the medium that makes in the cavity 15 can be quick carries out the pressure release, make the system pipeline can normally work, the security of system pipeline has been improved.

The distance between the side of the chamber 15 close to the valve cover 3 and the inlet line 11 is smaller than the distance between the side of the chamber 15 close to the valve seat 4 and the inlet line 11. Thereby enabling a large amount of medium to flow along the inlet line 11 to the side of the chamber 15 close to the inlet line 11, and the large amount of medium impacts the adjustment assembly 5, making it easier for the adjustment assembly 5 to be disengaged from the valve seat 4, and the outlet line 14 to be opened.

After the pressure relief is finished, the control valve controls the pressure relief pipeline 17 to be closed, at this time, no medium flows out from the pressure relief pipeline 17, the medium in the inlet branch 16 flows to one side of the cavity 15 close to the pressure relief pipeline 17, meanwhile, the medium flowing into the inlet pipeline 11 enters the cavity 15 and flows into the pressure relief pipeline 17 along a gap between the cavity 15 and the adjusting component 5, so that the pressure of the cavity 15 close to the pressure relief pipeline 17 gradually rises, finally, the pressure of the cavity 15 close to the pressure relief pipeline 17 is equal to the pressure of the cavity close to the valve seat 4, the stress of the adjusting component 5 close to the pressure relief pipeline 17 is greater than that of the adjusting component 5 close to the valve seat 4, and therefore the medium pushes the adjusting component 5 to move towards the direction close to the valve seat 4 until the adjusting component 5 is matched with the valve seat 4 again to seal the outlet pipeline 14.

Referring to fig. 2, 4 and 5, the adjusting assembly 5 includes a guide sleeve 51 located in the chamber 15, a plurality of through holes have been seted up on the guide sleeve 51, a plurality of through holes evenly distributed on the guide sleeve 51, the guide sleeve 51 joint is in the mounting groove 13, and there is the clearance between the lateral wall of guide sleeve 51 and the diapire of mounting groove 13, and the guide sleeve 51 sets up with the valve seat 4 coaxial line, all has the clearance between guide sleeve 51 and valve gap 3 and the valve seat 4. A piston 52 is slidably inserted into the guide sleeve 51. The piston 52 includes a rod 521 and a sleeve 522, the rod 521, the sleeve 522 and the guide sleeve 51 are coaxially disposed, a tightly-abutting groove 5221 is formed in an end wall of the sleeve 522 close to the valve cap 3, a spring 53 is inserted into the tightly-abutting groove 5221, the spring 53 is sleeved on the rod 521, and when the outlet pipe 14 is closed, the spring 53 is in a compressed state.

One side of the guide sleeve 51 close to the valve cap 3 is provided with a spring seat 54, the spring seat 54 is annular, the inner diameter of the spring seat 54 is larger than the diameter of the rod body 521, and the axis of the spring seat 54 and the axis of the guide sleeve 51 are arranged in a collinear manner. The spring seat 54 is sleeved with a limit ring 55, the limit ring 55 is located between the spring seat 54 and the guide sleeve 51, and the spring seat 54 and the limit ring 55 are both fixedly connected to one end of the guide sleeve 51 close to the valve cover 3 through bolts. The spring seat 54 and the limit ring 55 are connected with an adjusting pad in a clamping manner, and the adjusting pad blocks a gap between the image spring seat 54 and the limit ring 55.

The outer side wall of the sleeve body 522 is in contact with the inner side wall of the guide sleeve 51, one end of the sleeve body 522, which is close to the valve seat 4, is provided with an insertion groove 5222, the valve seat 56 is inserted into the insertion groove 5222, and when the outlet pipeline 14 is closed, the valve seat 56 protrudes out of one end of the guide sleeve 51, which is close to the valve seat 4. An annular groove 5224 is formed in the end face, close to the valve seat 4, of the sleeve body 522, a plurality of set screws 523 are fixedly connected to the groove wall of the annular groove 5224, the set screws 523 are arranged along the circumferential direction of the annular groove 5224, one end, close to the valve flap seat 56, of each set screw 523 protrudes out of the piston 52, an inserting annular groove 561 is formed in the position, corresponding to the set screws 523, of the valve flap seat 56, one end, protruding out of the piston 52, of each set screw 523 is inserted into the corresponding inserting annular groove 561, and the set screws 523 are matched with the inserting annular grooves 561 to fix the piston 52 and the valve flap seat 56.

A valve clack 58 is inserted into the valve clack seat 56, a fixing piece 57 is arranged in the valve clack seat 56, the valve clack seat 56 and the valve clack 58 are fixed by the fixing piece 57, the valve clack 58 protrudes out of one end, close to the valve seat 4, of the valve clack seat 56, and the valve clack 58 is abutted against the valve seat 4 to seal the outlet pipeline 14. The fixing groove 562 is formed in the inner side wall of the valve flap seat 56, the fixing piece 57 comprises a limiting sleeve 571 located in the fixing groove 562, a fixing ring groove 581 is formed in the side wall, located at one end of the fixing groove 562, of the valve flap 58, a fixing ring 572 is inserted into the fixing ring groove 581, and the fixing ring 572 is a four-ring, so that an operator can conveniently install the fixing ring 572 into the fixing ring groove 581. The fixing ring 572 protrudes from the valve flap 58, and the portion of the fixing ring 572 protruding from the valve flap 58 is located in the fixing groove 562, and the fixing ring 572 cooperates with the fixing groove 562 to fix the valve flap 58 and the valve flap seat 56.

When the pressure in the valve body 1 is abnormally increased, the control valve controls the pressure relief pipeline 17 to be opened, at the moment, the medium in the chamber 15 flows out of the valve body 1 along the pressure relief pipeline 17, so that the medium pressure of the chamber 15 close to the pressure relief pipeline 17 is smaller than the medium pressure of the chamber 15 close to the inlet pipeline 11, the medium pushes the valve flap seat 56, the valve flap 58 and the piston 52 to move along the guide sleeve 51, the piston 52 compresses the spring 53 while moving towards the valve cover 3, and at the moment, the spring 53 is further compressed; the valve clack 58 moves towards the direction close to the valve cover 3 to separate the valve clack 58 from the valve seat 4, and at the moment, the medium at the inlet pipeline 11 in the chamber 15 can rapidly flow out along the outlet pipeline 14, so that the pressure of the medium at the inlet pipeline 11 in the valve body 1 is rapidly reduced, and the possibility that the abnormal pressurization in the valve body 1 causes adverse effects on the safety of a system pipeline is reduced.

In order to discharge the medium in the chamber 15 more quickly along the outlet pipeline 14, the outer side walls of the guide sleeve 51, the valve clack seat 56 and the valve clack 58 close to one end of the valve seat 4 are all provided with guide ring surfaces, and the guide ring surfaces are bent towards the direction close to the axis of the valve seat 4, so that the medium in the chamber 15 can better flow into the pressure relief pipeline 17 along the guide ring surfaces, and the medium in the chamber 15 can be discharged out of the valve body 1 more quickly.

Because the contact position of the valve clack 58 and the valve clack seat 56 is stressed greatly, the contact position of the valve clack 58 and the valve clack seat 56 causes a phenomenon of stress concentration, and the possibility of cracks at the contact position of the valve clack 58 and the valve clack seat 56 can be caused; and the valve clack 58 and the valve clack seat 56 can rotate relatively when being matched, so that the contact position of the valve clack 58 and the valve clack seat 56 is abraded, and the service life of the valve clack 58 is adversely affected.

In order to prolong the service life of the valve clack 58, a surfacing layer 582 is welded at the contact part of the valve clack 58 and the valve clack seat 56, so that the service life of the valve clack 58 is prolonged. In order to reduce the possibility of clamping stagnation between the valve clack 58 and the valve clack seat 56, the valve clack seat 56 is provided with a matching groove 563 arranged corresponding to the surfacing layer 582, so that the possibility of clamping stagnation between the valve clack 58 and the valve clack seat 56 is reduced; and the matching groove 563 limits the valve clack 58, so that the valve clack 58 is better matched with the valve clack seat 56, and the outlet pipeline 14 is favorably closed.

When the medium pressure of the chamber 15 close to the inlet pipeline 11 is equal to the medium pressure of the chamber 15 close to the pressure relief pipeline 17, the control valve controls the pressure relief pipeline 17 to be closed, and at the moment, no medium flows out along the pressure relief pipeline 17; the medium flows to the installation groove 13 through the inlet pipeline 11, and simultaneously the medium can better flow to the position of the cavity 15 close to the pressure relief pipeline 17 along the through hole of the guide sleeve 51, so that the pressure of the side of the cavity 15 close to the pressure relief pipeline 17 is gradually increased; when the pressure in the chamber 15 near the pressure relief pipeline 17 is equal to the pressure in the chamber 15 near the inlet pipeline 11, because the area of contact between the piston 52 and the medium is larger than the area of contact between the valve flap 58 and the medium, the pressure on the piston 52 is larger than the pressure on the valve flap 58, so that the medium in the chamber 15 pushes the piston 52, the valve flap seat 56 and the valve flap 58 to move towards the direction near the valve seat 4 until the valve flap 58 abuts against the valve seat 4 again, the valve flap 58 cooperates with the valve seat 4 to block the outlet pipeline 14, and at this time, the medium does not flow out of the outlet pipeline 14 any more.

In the process of moving the piston 52, the spring 53 recovers deformation and pushes the piston 52, the valve flap seat 56 and the valve flap 58 to move better, and when the valve flap 58 is tightly pressed against the valve seat 4, the spring 53 is still in a compressed state, so that the tight pressing effect between the valve flap 58 and the valve seat 4 is better.

In order to enable the piston 52 to better move along the guide sleeve 51, a plurality of grooves 5223 are formed in the outer side wall of the sleeve body 522, and the grooves 5223 are distributed at equal intervals along the axial direction of the sleeve body 522; the contact area between the piston 52 and the guide sleeve 51 is reduced by providing the groove 5223, so that the piston 52 can be better moved along the guide sleeve 51. By providing the spring seat 54, the possibility of displacement of the bonnet 3 due to the force of the spring 53 caused by the direct contact of the spring 53 with the bonnet 3 is reduced, thereby reducing the possibility of the medium in the chamber 15 overflowing along the gap between the bonnet 3 and the valve body 1.

Referring to fig. 2 and 4, in order to reduce the adverse effect of the spring seat 54 on the valve cap 3, a blocking ring 33 is inserted into the inner side wall of the valve body 1 near one end of the valve cap 3, the inner diameter of the blocking ring 33 is smaller than that of the valve body 1 near one end of the valve cap 3, the blocking ring 33 is located on one side of the valve cap 3 near the spring seat 54, and the surface of the blocking ring 33 near the spring seat 54 contacts with the spring seat 54. When the spring seat 54 moves in a direction close to the bonnet 3, the stopper ring 33 limits the spring seat 54, and reduces the possibility that the spring seat 54 pushes the bonnet 3 to move.

In order to make the valve gap 3 better to the sealed effect of valve body 1, fixedly connected with is annular boss 31 on the valve gap 3, offer the seal groove 18 that corresponds with boss 31 on the valve body 1 is close to the terminal surface of valve gap 3, place sealing washer 32 in the seal groove 18, boss 31 pegs graft in seal groove 18, sealing washer 32 is the wound form packing ring, thereby make sealing washer 32 better with the laminating nature of seal groove 18 and boss 31, make the sealed effect between valve body 1 and the valve gap 3 better.

Referring to fig. 1, one of them surface of collar seat 2 has seted up a plurality of mounting holes 6 that run through collar seat 2, and a plurality of mounting holes 6 are along the equidistant distribution of circumference of collar seat 2, and mounting holes 6 are the screw hole in this embodiment, and in other embodiments, mounting holes 6 still can be the through-hole, makes valve body 1 can fix through bolt and other valves, makes things convenient for operating personnel to dismantle the maintenance to the pilot operated safety valve main valve.

The implementation principle of the main valve of the pilot operated safety valve with reliable sealing in the embodiment of the application is as follows: when the pressure in the valve body 1 is abnormally increased, the control valve controls the pressure relief pipeline 17 to be opened, the medium in the chamber 15 close to the pressure relief pipeline 17 flows out of the valve body 1 along the pressure relief pipeline 17, when the medium pressure in the chamber 15 close to the inlet pipeline 11 is larger than the medium pressure in the chamber 15 close to the pressure relief pipeline 17, the medium pushes the valve clack 58, the valve clack seat 56 and the piston 52 to move towards the direction close to the valve cover 3 along the guide sleeve 51, so that the valve clack 58 is separated from the valve seat 4, at the moment, the medium in the valve body 1 can rapidly flow out along the outlet pipeline 14, and in the moving process of the piston 52, the piston 52 further compresses the spring 53.

When the pressure relief is completed, the control valve controls the pressure relief pipeline 17 to be closed, the medium flowing into the inlet pipeline 11 flows into the chamber 15, when the medium pressure in the chamber 15 close to the inlet pipeline 11 is equal to the medium pressure in the chamber 15 close to the pressure relief pipeline 17, the medium pushes the piston 52, the valve clack seat 56 and the valve clack 58 to move towards the direction close to the valve seat 4, so that the valve clack 58 is abutted against the valve seat 4 again, the spring 53 recovers deformation in the moving process of the piston 52, when the valve clack 58 is abutted against the valve seat 4, the spring 53 is in a compression state, and at the moment, no medium flows out from the outlet pipeline 14.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. The pilot operated safety valve main valve with reliable sealing is characterized in that: the valve comprises a valve body (1), a mounting ring seat (2) is integrally formed on the outer side wall of one end of the valve body (1), a valve cover (3) is fixedly connected to the other end of the valve body (1) through a bolt, the mounting ring seat (2) is perpendicular to the axis of the valve cover (3), a cavity (15) is arranged in the valve body (1), an inlet pipeline (11) is arranged at one end, close to the mounting ring seat (2), of the valve body (1), an inlet branch (16) communicated with the cavity (15) is arranged on the inner side wall of the inlet pipeline (11), a pressure relief pipeline (17) is arranged at one end, opposite to the mounting ring seat (2), of the valve body (1), a control valve for controlling the opening and closing of the pressure relief pipeline (17) is arranged on the valve body (1), and an outlet pipeline (14) is arranged at one end, opposite to the valve cover (3), of the mounting ring seat (2), inlet line (11) pressure release pipeline (17) and outlet line (14) all with cavity (15) are linked together, joint has a uide bushing (51) in cavity (15), uide bushing (51) with valve gap (3) coaxial line sets up, the joint has a disk seat (4) in valve body (1), disk seat (4) are located valve body (1) is kept away from the one end of valve gap (3), be equipped with in uide bushing (51) and carry out confined adjusting part (5) with disk seat (4) cooperation to outlet line (14).

2. The pilot operated safety valve main valve according to claim 1, wherein: adjusting part (5) include sliding connection's piston (52) in uide bushing (51), piston (52) are including the body of rod (521) and cover body (522), cover body (522) are located the body of rod (521) is kept away from the one end of valve gap (3), a spring (53) has been cup jointed on the body of rod (521), spring (53) are kept away from the one end of the cover body (522) with valve gap (3) contact, spring (53) are in compression state, cover body (522) are kept away from the one end joint of the body of rod (521) has a valve clack seat (56), be equipped with mounting (57) in valve clack seat (56), there is a valve clack (58) through mounting (57) joint in valve clack seat (56), valve clack (58) with the butt between valve seat (4).

3. The pilot operated safety valve main valve according to claim 2, wherein: the valve comprises a valve seat (56) and is characterized in that a fixing groove (562) is formed in the inner side wall of the valve seat (56), a fixing piece (57) comprises a limiting sleeve (571) clamped in the fixing groove (562), an annular fixing ring groove (581) is formed in the position, corresponding to the limiting sleeve (571), of the outer side wall of the valve flap (58), a fixing ring (572) is inserted into the fixing ring groove (581), the outer side wall of the fixing ring (572) is in contact with the inner side wall of the limiting sleeve (571), the outer diameter of the fixing ring (572) is larger than the outer diameter of the valve flap (58) at one end of the limiting sleeve (571), and the end face, close to the valve seat (4), of the fixing ring (572) is in contact with the groove wall of the fixing groove (562).

4. The pilot operated safety valve main valve according to claim 2, wherein: one end, close to the valve cover (3), of the guide sleeve (51) is fixedly connected with a spring seat (54) and a limiting ring (55) through a bolt, the limiting ring (55) is located on one side, away from the valve cover (3), of the spring seat (54), an adjusting pad is arranged between the spring seat (54) and the limiting ring (55), the adjusting pad is in contact with the spring seat (54) and the limiting ring (55), and one end, close to the valve cover (3), of the spring (53) is abutted to the spring seat (54).

5. The pilot operated safety valve main valve according to claim 2, wherein: and a surfacing layer (582) is welded at the position where the valve clack (58) is contacted with the valve clack seat (56).

6. The pilot operated safety valve main valve according to claim 5, wherein: and a matching groove (563) matched with the surfacing layer (582) is formed in the valve flap seat (56).

7. The pilot operated safety valve main valve according to claim 4, wherein: the valve body (1) is close to the joint has one to hinder and moves ring (33) on the inside wall of valve gap (3) one end, hinder and move ring (33) and be located valve gap (3) are close to one side of spring holder (54), hinder move ring (33) protrusion in the inside wall of valve body (1), spring holder (54) with hinder and move ring (33) butt.

8. The pilot operated safety valve main valve according to claim 2, wherein: the outer side wall of the sleeve body (522) is provided with a plurality of grooves (5223).

9. The pilot operated safety valve main valve according to claim 2, wherein: the side wall of one end, close to the valve seat (4), of the valve clack (58) is a flow guide ring surface, and the flow guide ring surface is bent towards the direction close to the axis of the valve clack (58).

10. The pilot operated safety valve main valve according to claim 1, wherein: the distance between one side of the cavity (15), which is close to the valve cover (3), and the inlet pipeline (11) is smaller than the distance between one side of the cavity (15), which is close to the valve seat (4), and the inlet pipeline (11).

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