CN219588170U

CN219588170U - Double-row pilot operated safety valve

Info

Publication number: CN219588170U
Application number: CN202321079194.XU
Authority: CN
Inventors: 余秀克; 张俊策; 金秀烙; 金益丰; 柳温豪; 陈云杰
Original assignee: TIANZHENG VALVE CO LTD
Current assignee: TIANZHENG VALVE CO LTD
Priority date: 2023-05-05
Filing date: 2023-05-05
Publication date: 2023-08-25
Anticipated expiration: 2033-05-05

Abstract

The utility model discloses a double-row pilot type safety valve, which comprises a main valve and a pilot valve assembly, wherein the main valve comprises a main valve body, a valve cover arranged at the upper end of the main valve body, a guide sleeve arranged in the main valve body, a valve core arranged in the guide sleeve in an axial sliding manner and a main spring for applying axial acting force to the valve core, the main valve body is provided with an inlet runner and a main runner, and a valve seat is arranged in the main valve body; the pilot valve assembly is provided with two groups, the pilot valve assembly comprises pilot valves, the input end of each pilot valve is communicated with the inlet flow passage of the main valve body through a first pressure guiding pipe, a second pressure guiding pipe is connected to the output end of each pilot valve, a third pressure guiding pipe communicated with the inside of the main valve body is arranged on the valve cover, the third pressure guiding pipes and the two second pressure guiding pipes are connected together through a three-way joint, and control valves are arranged on the first pressure guiding pipes and the second pressure guiding pipes on the two pilot valves. The utility model has wide application range, can switch the safety valve under different pressures by switching different pilot valves, and is very convenient to operate.

Description

Double-row pilot operated safety valve

Technical Field

The utility model relates to the technical field of valves, in particular to a double-row pilot type safety valve.

Background

The pilot operated relief valve is an indirect load type relief valve. Consisting of a main valve and a pilot valve (also called "sub-valve"), the main valve being driven by means of a medium discharged from the pilot valve, the pressure in the system being in the form of pulses, so called also "pulse relief valve". The pilot valve itself is also a direct load type safety valve, seen separately. When the medium pressure reaches the opening pressure of the pilot valve, the pilot valve is opened in advance, and the discharged medium enters the main valve from the bypass pipe.

The utility model patent with the patent application number of CN201910455270.4 discloses a pilot-operated safety valve, which comprises a main valve and a setting valve body, wherein the setting valve body is positioned above the main valve body, and the pilot-operated safety valve is only provided with a group of pilot valves, so that the pilot-operated safety valve can be used only under specific pressure, and safety valves with different specifications are replaced under the working environment with large medium pressure change, so that the pilot-operated safety valve has the advantages of small application range and very inconvenient use.

Disclosure of Invention

The utility model aims to provide a double-row pilot type safety valve, which has a wide application range, and can be switched under different pressures by switching different pilot valves, so that the operation is very convenient.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the double-row pilot type safety valve comprises a main valve body and a pilot valve assembly, wherein the main valve body comprises a main valve body, a valve cover arranged at the upper end of the main valve body, a guide sleeve arranged in the main valve body, a valve core arranged in the guide sleeve in an axial sliding manner and a main spring for applying axial acting force to the valve core, an inlet flow channel and a main flow channel which are mutually communicated are arranged on the main valve body, and a valve seat which is used for being in sealing fit with the valve core is arranged in the main valve body and corresponds to the position between the inlet flow channel and the main flow channel; the pilot valve assembly is provided with two groups, the pilot valve assembly comprises pilot valves, the input ends of the pilot valves are communicated with an inlet runner of a main valve body through first pressure guiding pipes, second pressure guiding pipes are connected to the output ends of the pilot valves, third pressure guiding pipes communicated with the inside of the main valve body are arranged on the valve cover, the third pressure guiding pipes and the two second pressure guiding pipes are connected together through tee joints, and control valves are arranged on the first pressure guiding pipes and the second pressure guiding pipes on the two pilot valves.

Through adopting above-mentioned technical scheme, adopt doublestage regulation and control pilot valve control structure, a main valve takes two pilot valves and through leading pressure pipe parallel connection, two pilot valves set up two different setting pressure levels, can carry out solitary pressure adjustment, switch through the control valve and use different pilot valves, make the relief valve switch the use under different pressures, the switching operation is very convenient, has promoted the application scope of relief valve greatly.

The utility model further provides that the first pressure guiding pipe is provided with a one-way filter valve.

By adopting the technical scheme, the medium can only flow along one direction, so that the medium is prevented from flowing back and impurities in the medium are filtered.

The utility model is further arranged such that the control valve is a needle valve.

By adopting the technical scheme, the needle valve is a mass production part, is easy to purchase in the market, is convenient to install and disassemble, has small volume and rapid adjustment, and is very suitable for being used as a control valve.

The valve is further characterized in that a diaphragm is clamped between the guide sleeve and the valve cover, the diaphragm is made of RPTFE material, and the diaphragm is arranged above the valve core.

By adopting the technical scheme, the safety valve can prevent metal from touching the metal when being opened, reduce the vibration of the valve clack of the safety valve when being opened, and improve the stability of the valve.

The main valve is further arranged in a way that the main valve further comprises a sealing ring and a pressing plate, the lower end of the valve core is provided with a mounting groove, the sealing ring is arranged in the mounting groove in an axial sliding mode, the lower end of the sealing ring extends out of the mounting groove and is propped against the valve seat when being closed, the upper end of the sealing ring is provided with a limiting flange extending inwards, the inner end of the mounting groove is provided with a plurality of pressure springs which apply axial acting force to the limiting flange, the pressing plate is arranged at the bottom of the valve core through an inner hexagon screw, the pressing plate is provided with a supporting flange extending outwards and used for limiting the limiting flange in a downward stroke mode, and a floating gap used for enabling the limiting flange to axially move is formed between the supporting flange and the inner end face of the mounting groove.

Through adopting above-mentioned technical scheme, not only can realize the removable advantage of sealing ring, but the design that the sealing ring axially floats moreover has the absorbing function, can avoid valve core and disk seat to produce the rigidity striking and damage when the valve closes.

The utility model is further characterized in that a plurality of spring cavities corresponding to the pressure springs in number are arranged at the inner ends of the mounting grooves along the circumferential direction, positioning grooves corresponding to the spring cavities are arranged on the limiting flanges, the pressure springs are arranged in the spring cavities, and the lower ends of the pressure springs are embedded into the corresponding positioning grooves.

Through adopting above-mentioned technical scheme, can realize pressure spring's location installation, guarantee pressure spring motion's stability.

The utility model is further characterized in that the outer periphery of the sealing ring is provided with an O-shaped ring which is used for being in sealing fit with the inner wall of the mounting groove.

By adopting the technical scheme, the reliable tightness between the sealing ring and the inner wall of the mounting groove can be ensured, so that the leakage of an internal medium from a gap between the sealing ring and the mounting groove when the valve is closed is avoided.

The utility model is further characterized in that the support flange is provided with a plurality of pressure stabilizing holes in a circumferential array, and the pressure stabilizing holes are communicated with the upper end and the lower end of the support flange.

By adopting the technical scheme, the pressure balance at the upper end and the lower end of the support flange can be ensured, so that the sealing ring can slide up and down smoothly.

The utility model is further characterized in that the lower end of the pressing plate is provided with a groove for embedding the screw head of the inner hexagon screw, and the groove is inserted with a waterproof plug.

Through adopting above-mentioned technical scheme, can avoid the screw head part of hexagon socket head cap screw to rust to can carry out the rotation operation of hexagon socket head cap screw when guaranteeing the later maintenance.

Drawings

FIG. 1 is a schematic view of the overall structure of the present utility model;

FIG. 2 is a schematic view of the internal structure of the present utility model;

fig. 3 is an enlarged schematic view of the portion a in fig. 2.

In the figure: 1. a main valve; 2. a pilot valve assembly; 3. a main valve body; 4. a valve cover; 5. a guide sleeve; 6. a valve core; 7. a main spring; 8. an inlet flow passage; 9. a main flow passage; 10. a valve seat; 11. a pilot valve; 13. a first pressure guiding pipe; 14. a second pressure guiding pipe; 15. a third pressure guiding pipe; 16. a three-way joint; 17. a control valve; 18. a one-way filter valve; 19. a membrane; 20. a seal ring; 21. a pressing plate; 22. a mounting groove; 23. a limit flange; 24. a pressure spring; 25. an inner hexagon screw; 26. a support flange; 27. a floating gap; 28. a spring cavity; 29. a positioning groove; 30. an O-ring; 31. a pressure stabilizing hole; 32. a groove; 33. waterproof plugs.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Examples: the double-row pilot type safety valve shown in the attached drawings 1-3 comprises a main valve 1 and a pilot valve assembly 2, wherein the main valve 1 comprises a main valve body 3, a valve cover 4 (the main valve body and the pilot valve assembly are connected through bolts) arranged at the upper end of the main valve body 3, a guide sleeve 5 (the upper end of the guide sleeve 5 is provided with a flange extending towards the periphery, the flange is clamped between the valve cover 4 and the main valve body 3), a valve core 6 (the periphery of the valve core 6 is provided with a sealing ring) axially and slidingly arranged in the guide sleeve 5, and a main spring 7 for applying axial force to the valve core 6, an inlet runner 8 and a main runner 9 which are communicated with each other are arranged on the main valve body 3, and a valve seat 10 for forming sealing fit with the valve core 6 is arranged at a position between the corresponding inlet runner 8 and the main runner 9 in the main valve body 3; the pilot valve assembly 2 is provided with two groups, the pilot valve assembly 2 comprises a pilot valve 11, the pilot valve 11 is a conventional part, the pilot valve 11 is a standard spring direct load type safety valve, therefore, the specific structure is not described in detail herein, the input end of the pilot valve 11 is communicated with the inlet flow passage 8 of the main valve body 3 through a first pressure guiding pipe 13, namely, a first through hole is arranged at the position of the main valve body 3 corresponding to the inlet flow passage 8, the first pressure guiding pipe 13 is connected to the first through hole through a joint, the output end of the pilot valve 11 is connected with a second pressure guiding pipe 14, the valve cover 4 is provided with a third pressure guiding pipe 15 communicated with the inside of the main valve body 3, namely, the valve cover 4 is provided with a second through hole, the third pressure guiding pipe 15 is connected to the second through hole through a joint, the third pressure guiding pipe 15 and the two second pressure guiding pipes 14 are connected together through a three-way joint 16, and the first pressure guiding pipes 13 and the second pressure guiding pipes 14 on the two pilot valves 11 are provided with control valves 17. By adopting a two-stage regulating pilot valve 11 control structure, one main valve 1 is provided with two pilot valves 11 which are connected in parallel through pressure guiding pipes, the two pilot valves 11 are provided with two different setting pressure stages, independent pressure adjustment can be carried out, and the different pilot valves 11 are switched and used through the control valve 17, so that the safety valve is switched and used under different pressures, the switching operation is very convenient, and the application range of the safety valve is greatly improved.

As shown in fig. 1, the first pressure guiding pipe 13 is provided with a one-way filter valve 18, and the one-way filter valve 18 is a conventional component, so the specific structure thereof will not be described in detail herein. The one-way filter valve 18 is provided to allow the media to flow in only one direction, preventing backflow of the media and filtering impurities within the media.

Wherein the control valve 17 is a needle valve. The needle valve is a mass production part, is easy to purchase in the market, is convenient to assemble and disassemble, small in size and rapid to adjust, and is very suitable for being used as the control valve 17.

As shown in fig. 2, a membrane 19 is sandwiched between the guide sleeve 5 and the valve cover 4, the membrane 19 is made of RPTFE material, and the membrane 19 is disposed above the valve core 6. The diaphragm 19 is arranged at the position to prevent metal collision when the safety valve is opened, reduce vibration of the valve clack of the safety valve when the safety valve is opened and improve the stability of the valve.

As shown in fig. 2, the main valve 1 further includes a sealing ring 20 and a pressing plate 21, the lower end of the valve core 6 is provided with a mounting groove 22, the sealing ring 20 is axially slidably disposed in the mounting groove 22, and the lower end of the sealing ring 20 extends out of the mounting groove 22 to abut against the valve seat 10 when being closed, the upper end of the sealing ring 20 is provided with a limiting flange 23 extending toward the inner circumference, the inner end of the mounting groove 22 is provided with a plurality of pressure springs 24 applying axial force to the limiting flange 23, the pressing plate 21 is mounted at the bottom of the valve core 6 through an inner hexagonal screw 25, the pressing plate 21 is provided with a supporting flange 26 extending toward the outer circumference to limit the limiting flange 23 to form a lower stroke, and a floating gap 27 for axially moving the limiting flange 23 is formed between the supporting flange 26 and the inner end surface of the mounting groove 22. The design not only can realize the replaceable advantage of the sealing ring 20, but also has the damping function due to the axially floating design of the sealing ring 20, and can avoid the damage caused by the rigid collision between the valve core 6 and the valve seat 10 when the valve is closed.

As shown in fig. 2 and 3, the inner end of the mounting groove 22 is provided with a plurality of spring cavities 28 corresponding to the pressure springs 24 in number along the circumferential direction, the limit flange 23 is provided with positioning grooves 29 corresponding to the spring cavities 28, the pressure springs 24 are arranged in the spring cavities 28, and the lower ends of the pressure springs 24 are embedded into the corresponding positioning grooves 29. The design can realize the positioning and the installation of the pressure spring 24, and ensure the stability of the movement of the pressure spring 24.

As shown in fig. 3, an O-ring 30 is mounted on the outer periphery of the seal ring 20 for sealing engagement with the inner wall of the mounting groove 22. This design ensures a reliable seal between the sealing ring 20 and the inner wall of the mounting groove 22, thereby avoiding leakage of the internal medium from the gap between them when the valve is closed.

As shown in fig. 3, the support flange 26 is provided with a plurality of pressure stabilizing holes 31 distributed in a circumferential array, and the pressure stabilizing holes 31 are communicated with the upper end and the lower end of the support flange 26. This design ensures pressure balance at the upper and lower ends of the support flange 26, thereby allowing smooth up and down sliding movement of the seal ring 20.

As shown in fig. 2 and fig. 3, a groove 32 for embedding the screw head of the socket head cap screw 25 is formed at the lower end of the pressing plate 21, and a waterproof plug 33 is inserted into the groove 32, and the waterproof plug 33 is made of rubber material. The design can avoid the screw head part of the socket head cap screw 25 from rusting, thereby ensuring the rotation operation of the socket head cap screw 25 during the later maintenance.

Claims

1. The double-row pilot type safety valve comprises a main valve (1) and a pilot valve assembly (2), wherein the main valve (1) comprises a main valve body (3), a valve cover (4) arranged at the upper end of the main valve body (3), a guide sleeve (5) arranged in the main valve body (3), a valve core (6) arranged in the guide sleeve (5) in an axial sliding manner and a main spring (7) applying axial acting force to the valve core (6), an inlet runner (8) and a main runner (9) which are communicated with each other are arranged on the main valve body (3), and a valve seat (10) used for forming sealing fit with the valve core (6) is arranged at a position between the corresponding inlet runner (8) and the main runner (9) in the main valve body (3); the method is characterized in that: the pilot valve assembly (2) is provided with two groups, the pilot valve assembly (2) comprises pilot valves (11), the input end of the pilot valves (11) is communicated with an inlet runner (8) of a main valve body (3) through a first pressure guiding pipe (13), a second pressure guiding pipe (14) is connected to the output end of the pilot valves (11), a third pressure guiding pipe (15) communicated with the inside of the main valve body (3) is arranged on a valve cover (4), the third pressure guiding pipe (15) and the two second pressure guiding pipes (14) are connected together through a three-way joint (16), and a control valve (17) is arranged on the first pressure guiding pipe (13) and the second pressure guiding pipe (14) on the two pilot valves (11).

2. The double-row pilot operated safety valve according to claim 1, wherein: the first pressure guiding pipe (13) is provided with a one-way filter valve (18).

3. The double-row pilot operated safety valve according to claim 1, wherein: the control valve (17) is a needle valve.

4. The double-row pilot operated safety valve according to claim 1, wherein: a diaphragm (19) is clamped between the guide sleeve (5) and the valve cover (4), the diaphragm (19) is made of RPTFE material, and the diaphragm (19) is arranged above the valve core (6).

5. The double-row pilot operated safety valve according to claim 1, wherein: the main valve (1) further comprises a sealing ring (20) and a pressing plate (21), the lower end of the valve core (6) is provided with a mounting groove (22), the sealing ring (20) is arranged in the mounting groove (22) in an axial sliding mode, the lower end of the sealing ring (20) extends out of the mounting groove (22) and is used for abutting against the valve seat (10) when being closed, the upper end of the sealing ring (20) is provided with a limiting flange (23) extending towards the inner circumference, the inner end of the mounting groove (22) is provided with a plurality of pressure springs (24) for applying axial acting force to the limiting flange (23), the pressing plate (21) is mounted at the bottom of the valve core (6) through an inner hexagon screw (25), the pressing plate (21) is provided with a supporting flange (26) extending towards the outer circumference and used for limiting the limiting flange (23) to form a lower stroke, and a floating gap (27) for axially moving the limiting flange (23) is formed between the supporting flange (26) and the inner end surface of the mounting groove (22).

6. The double-row pilot operated safety valve according to claim 5, wherein: the inner end of the mounting groove (22) is provided with a plurality of spring cavities (28) which are equivalent to the pressure springs (24) in number along the circumferential direction, the limiting flange (23) is provided with positioning grooves (29) corresponding to the spring cavities (28), the pressure springs (24) are arranged in the spring cavities (28), and the lower ends of the pressure springs (24) are embedded into the corresponding positioning grooves (29).

7. The double-row pilot operated safety valve according to claim 5, wherein: an O-shaped ring (30) used for forming sealing fit with the inner wall of the mounting groove (22) is arranged on the periphery of the sealing ring (20).

8. The double-row pilot operated safety valve according to claim 5, wherein: a plurality of pressure stabilizing holes (31) are distributed on the support flange (26) in a circumferential array, and the pressure stabilizing holes (31) are communicated with the upper end and the lower end of the support flange (26).

9. The double-row pilot operated safety valve according to claim 5, wherein: the lower end of the pressing plate (21) is provided with a groove (32) for embedding a screw head of an inner hexagonal screw (25), and a waterproof plug (33) is inserted into the groove (32).