CN217030095U - Pilot-operated type safety valve structure - Google Patents
Pilot-operated type safety valve structure Download PDFInfo
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- CN217030095U CN217030095U CN202123050712.9U CN202123050712U CN217030095U CN 217030095 U CN217030095 U CN 217030095U CN 202123050712 U CN202123050712 U CN 202123050712U CN 217030095 U CN217030095 U CN 217030095U
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Abstract
The utility model provides a pilot operated safety valve structure, which comprises a valve body, a main valve core, a valve cover, a diaphragm and a locking piece, wherein the inner side of the valve body is provided with a first channel, a second channel and a third channel, two ends of the valve body are provided with a first groove and a second groove, the main valve core is positioned at the inner side of the valve body, a first end is positioned in the first groove, a second end penetrates through the first channel, a channel hole communicated with the second channel is arranged in the main valve core, and the channel hole is communicated with the second groove; the valve cover is fixedly connected with the valve body, the valve cover and the second groove define a cavity, the valve cover is provided with an exhaust hole, and the aperture of the exhaust hole is smaller than that of the channel hole; the diaphragm and the locking piece are located in the cavity, the diaphragm designs pressure on the main valve core so that the first end of the main valve core seals the first channel, open air flows into the cavity through the third channel and the channel hole, and back pressure is applied to the diaphragm to push the main valve core to open the valve inlet. The valve can improve the precision and reliability of adjustment.
Description
Technical Field
The utility model relates to the technical field of valves of power systems, in particular to a pilot operated safety valve structure.
Background
With the rapid development of the aerospace industry, all the technologies related to the rocket field also realize the rapid advance. The safety valve is an important component of a self-generated pressurizing conveying system of the liquid rocket engine and plays an important role in a pressurizing path. The safety valve is arranged at the outlet of the pressure reducing valve and has the functions of opening the exhaust to enable the pressure at the outlet of the pressure reducing valve to be restored to a safety range and closing the valve of the safety valve to protect the safety of the system when the pressure at the outlet of the pressure reducing valve is over-adjusted. A common design solution is to use a direct acting safety valve to achieve sealing and safe venting. However, this solution is suitable for systems where the opening and closing pressure difference allows a larger system. For a system with the minimum opening and closing pressure difference, the pressure precision requirements of sealing, opening and seat returning are hardly met by using the direct-acting safety valve, so that the reliability and the safety of the system are greatly reduced.
Therefore, it is highly desirable to provide a safety valve which can improve the adjustment accuracy and reliability and ensure the safe operation of the liquid rocket engine.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a pilot operated safety valve structure. The valve can improve the adjustment precision and reliability, and ensure the safe operation of the liquid rocket engine, thereby improving the working reliability and efficiency of the liquid rocket engine.
One aspect of the present invention provides a pilot operated safety valve structure comprising a valve body, a main spool, a bonnet, a diaphragm having elasticity, and a locking member, wherein,
the inner side of the valve body is provided with a first channel for gas medium to flow through, a second channel and a third channel which is different from the extending direction of the first channel, a first groove and a second groove which are concave towards the center of the valve body are respectively arranged at two ends of the valve body, and the first groove and the second groove are communicated through the first channel;
the main valve core is positioned on the inner side of the valve body, the first end of the main valve core is positioned in the first groove, the second end of the main valve core penetrates through the first channel, a channel hole communicated with the second channel is formed in the main valve core and on one side, close to the second groove, of the main valve core, and one end, far away from the second channel, of the channel hole is communicated with the second groove;
the valve cover is fixedly connected with the valve body, a cavity is defined by the valve cover and the second groove, an exhaust hole is formed in the valve cover, and the aperture of the exhaust hole is smaller than that of the channel hole;
the diaphragm and the locking piece are positioned in the cavity, the diaphragm and the locking piece are respectively sleeved on the main valve core, the diaphragm is fixedly arranged on the main valve core through the locking piece, the diaphragm is abutted against the groove bottom of the second groove along the outer end face in the circumferential direction,
and opening air flow enters the cavity through the third channel and the channel hole, and back pressure is applied to the diaphragm to push the main valve core to open the valve inlet.
Further, the main valve core comprises a first valve core part and a second valve core part which are integrally designed, the outer shapes of the first valve core part and the second valve core part are cylindrical structures, the diameter of the first valve core part is larger than the aperture of the first channel, and the circumferential outer surface of the second valve core part is tightly attached to the inner wall of the first channel and can freely move inside the first channel; the first valve core part is attached to or separated from the groove bottom of the first groove, so that the first channel and the third channel are closed or communicated.
Further, the second valve core portion is provided at least two seal rings on a circumferential surface thereof, and the two seal rings are respectively disposed on both sides of a communication portion of the second passage and the passage hole.
Furthermore, an annular inner groove for fixing the sealing ring in a matched manner is formed in the first channel wall, the inner side of the sealing ring is tightly attached to the outer surface of the second valve core part, and the outer side of the sealing ring is located in the annular inner groove.
Furthermore, one side of the first valve core part, which is close to the bottom of the first groove, is provided with an annular sealing gasket and an annular groove for matching and fixing the annular sealing gasket.
Further, still be equipped with the boss on the valve body, the boss is the valve body to the protruding convex structure of valve gap direction behind the inboard salient, and the inboard of boss forms a part of first passageway, the outside with form the ring channel between the valve body inner wall.
Furthermore, the valve body is sequentially provided with a first part with a first diameter and a second part with a second diameter from the matching side of the valve body and the valve cover to the direction of the first groove, and the first diameter is larger than the second diameter, so that the diaphragm is abutted on the table top of the transition from the first part to the second part.
Furthermore, the valve cover is further provided with a concave part, a second elastic part and an auxiliary valve core, the concave part is positioned in the middle of the valve cover and faces the main valve core, the second elastic part and the auxiliary valve core are positioned on the inner side of the concave part, one end of the second elastic part is abutted against the bottom surface of the concave part, and the other end of the second elastic part is connected with the auxiliary valve core. The second elastic member is used for applying pressure to the auxiliary valve core so that the auxiliary valve core closes the passage hole of the main valve core.
Furthermore, the axis of the auxiliary valve core and the axis of the first channel are overlapped, and one end of the auxiliary valve core is abutted to the main valve core.
Further, the circumferential outer surface of the valve cover is provided with external threads, and the inner side of the valve body is provided with internal threads matched with the external threads; the valve cover is of a cylindrical structure; the second elastic piece is a spring; the locking piece is a locking nut.
The embodiment of the utility model provides a pilot operated safety valve structure which comprises a valve body, a main valve core, a valve cover, a diaphragm and a locking piece.
When a small amount of gas medium enters the valve body, the gas medium firstly enters the passage hole in the main valve core through the second passage, and then the gas medium enters the cavity. The aperture of the vent hole is smaller than that of the channel hole, so that the gas medium entering the cavity from the channel hole is larger than the gas medium flowing out of the vent hole, the amount of the gas medium in the cavity is increased, the pressure can apply back pressure on the diaphragm to push the main valve core to open the valve inlet, the first channel is communicated with the third channel, and the gas medium is quickly discharged out of the valve body from the third channel.
When the gas medium in the valve body is reduced, namely the pressure applied to the back of the diaphragm by the gas medium entering the cavity is not enough to deform the diaphragm, the main valve core closes the valve inlet. In addition, the design that the diaphragm and the locking part are respectively sleeved on the main valve core can prevent the diaphragm from moving radially, so that a gas medium can apply pressure to the diaphragm quickly, the valve is convenient to improve the adjusting rate, and the working efficiency of the valve is further improved.
The whole safety valve can improve the adjustment precision and reliability, and ensure the safe operation of the liquid rocket engine, thereby improving the working reliability and efficiency of the liquid rocket engine.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description, serve to explain the principles of the utility model.
FIG. 1 is a schematic structural diagram of a pilot operated safety valve according to the present invention;
FIG. 2 is a schematic cross-sectional view of the valve body, main spool and bonnet of the present invention;
FIG. 3 is a schematic structural view of the valve body and the main valve element of the present invention;
fig. 4 is a structural schematic view of the valve cover of the present invention;
FIG. 5 is a schematic structural view of a main spool of the present invention;
fig. 6 is a perspective view of the boss of the present invention.
Description of reference numerals:
1 valve body 2 main valve core
3 valve cover 4 first elastic piece
5 diaphragm 6 locking piece
7 first channel 8 second channel
9 first recess 10 second recess
11 channel hole 12 exhaust hole
13 boss 14 cavity
15 sealing ring 16 first valve core part
17 second valve core portion 18 annular inner groove
19 channel cavity 20 annular groove
21 mesa 22 recess
23 second elastic member 24 auxiliary spool
25 third channel
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the utility model, the detailed description should not be construed as limiting the utility model but as a more detailed description of certain aspects, features and embodiments of the utility model.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
One aspect of the present invention provides a pilot operated safety valve structure. As shown in fig. 1, 2, 3, 4 and 5, the safety valve comprises a valve body 1, a main valve element 2, a valve cover 3, a diaphragm 5 having elasticity, and a locking member 6. Wherein the inner side of the valve body 1 is provided with a first channel 7 for the circulation of gas media, a second channel 8 and a third channel 25 with a different extending direction from the first channel 7, two ends of the valve body 1 are respectively provided with a first groove 9 and a second groove 10 which are concave towards the center of the valve body 1, and the first groove 9 and the second groove 10 are communicated through the first channel 7 (the space of the first groove 9 forms a part of the first channel 7 of the valve body 1). Main valve element 2 is located inside valve body 1, a first end of main valve element is located inside first groove 9, a second end of main valve element extends through first channel 7, a channel hole 11 communicated with second channel 8 is arranged inside main valve element 2 and on one side close to second groove 10, and one end of channel hole 11 far away from second channel 8 is communicated with second groove 10.
The valve cover 3 is fixedly connected with the valve body 1, a cavity 14 is limited by the valve cover 3, the diaphragm 5 and the second groove 10, an exhaust hole 12 is arranged on the valve cover 3, and the aperture of the exhaust hole 12 is smaller than that of the channel hole 11.
The opening flow enters the cavity 14 through the third channel 25, the channel hole 11, and exerts a back pressure on the diaphragm 5 to push the main spool 2 to open the valve inlet.
Specifically, the pilot operated safety valve structure comprises a valve body 1, a main valve core 2, a valve cover 3, a diaphragm 5 and a locking piece 6.
In the initial state, the safety valve is in a closed state, namely the main valve element 2 is closed, and the first channel 7 is not communicated with the third channel 25. When a small amount of gaseous medium enters the valve body, the gaseous medium first enters the passage opening inside the main valve element via the second passage 8, after which the gaseous medium enters the cavity 14. Because the aperture of the vent hole 12 is smaller than that of the channel hole 11, the gas medium entering the cavity 14 from the channel hole 11 is larger than the gas medium flowing out of the vent hole 12, so that the amount of the gas medium in the cavity 14 is increased, the pressure can apply back pressure on the diaphragm 5 to push the main valve element 2 to open the valve inlet, the first channel 7 is communicated with the third channel 25, and the gas medium is rapidly discharged out of the valve body from the third channel 25.
When the gas medium in the valve body 1 is reduced, that is, the pressure applied to the back of the diaphragm 5 by the gas medium entering the cavity 14 is not enough to deform the diaphragm (the diaphragm is deformed to be small and cannot drive the main valve element to move to one side of the first groove), the main valve element closes the inlet of the valve, and in addition, the valve body 1 and all parts can be conveniently installed in the valve body 1 through the design of the first groove 9 and the second groove 10. In addition, the design on main valve core 2 is established respectively to the relief valve of this application through diaphragm 5 and retaining member 6 cover, can avoid diaphragm 5 to take place radial movement, makes things convenient for gaseous medium to exert pressure to diaphragm 5 to improve the governing rate of valve, and then improve the work efficiency of valve. The whole design can improve the adjusting precision and reliability of the safety valve and ensure the safe operation of the liquid rocket engine, thereby improving the working reliability and efficiency of the liquid rocket engine.
It should be noted that, in order to facilitate movement of main valve 2 and sealing main valve 2 from first passage 7, for example, main valve 2 includes a first valve core portion 16 and a second valve core portion 17, and the outer shapes of first valve core portion 16 and second valve core portion 17 are cylindrical structures, and the diameter of first valve core portion 16 is larger than the bore diameter of first passage 7. Wherein the second valve core portion 17 has a circumferential outer surface abutting against an inner wall of the first passage 7 and is freely movable inside the first passage 7. The first spool portion 16 achieves closing/conduction of the first channel 7 and the third channel 25 by abutting/separating with a groove bottom of the first groove 9 (a surface of the first spool portion 16 and the first groove 9 on a side close to each other). In order to make the first spool portion 16 and the second spool portion 17 tightly connected and firmly fixed, for example, the first spool portion 16 and the second spool portion 17 are integrally formed.
For convenience of diaphragm resetting (gas medium in the cavity applies pressure to the diaphragm to one side of the first groove, so that the diaphragm bends to one side of the first groove, and even if the diaphragm bends to one side of the valve cover to restore to the original state after resetting), for example, the valve body further comprises a first elastic part 4, the first elastic part 4 is arranged on one side, away from the locking part, of the diaphragm 5, the first elastic part 4 is used for applying tension to the main valve element 2, so that the first end of the main valve element 2 seals the first channel 7, the first elastic part 4 is located in the cavity 14, the first elastic part 4 is sleeved on the main valve element 2, and one end of the first elastic part 4 is abutted to one side, close to the first elastic part 4, of the diaphragm 5. In order to make the diaphragm and the main valve element tightly connected and firmly fixed, for example, when the diaphragm is deformed by pressure, the diaphragm and the main valve element are connected through screw threads in order to facilitate the diaphragm to drive the main valve element to move, namely, the diaphragm and the main valve element are fixed together, and the main valve element can move in the first channel along with the deformation of the diaphragm.
It should be noted that, in order to prevent the gaseous medium from leaking into the first channel 7 from the gap between the connection portion of the second channel 8 and the channel hole 11, for example, the circumferential surface of the second valve core 17 is provided with at least two sealing rings, and the two sealing rings 15 are respectively disposed at two sides of the connection portion of the second channel 8 and the channel hole 11, so as to reduce the outflow of the gaseous medium from the gap between the inner surface of the first channel 7 and the outer surface of the second valve core 17, ensure that the gaseous medium acts into the cavity quickly, complete the back expansion of the diaphragm 5 (bending to the side of the first valve core 16) and the opening of the main valve 2, and ensure the quick connection between the first channel 7 and the third channel 25.
It should be noted in particular that, in order to avoid axial displacement of the sealing ring 15, the sealing ring 15 is advantageously fixed, for example, an annular inner groove 18 is provided in the wall of the first passage 7 for the fitting of the sealing ring 15, the inner side of the sealing ring 15 abuts against the outer surface of the second valve core portion 17, and the outer side of the sealing ring 15 is located in the annular inner groove 18.
In addition, in order to improve the sealing performance of the medium inlet and reduce the direct contact between the first valve core part 16 and the end surface of the first channel 7, an annular sealing gasket is arranged on one side, close to the bottom of the first groove 9, of the first valve core part 16. The annular sealing gasket can reduce the damage of the end surfaces of the first valve core part 16 and the first channel 7 caused by frequent opening and closing of the main valve core 2. In addition, in order to prevent the annular seal gasket from falling off and improve the stability of the annular seal gasket, for example, an annular groove 20 for fitting and fixing the annular seal gasket may be provided in the first valve core portion 16.
In addition, as shown in fig. 1, fig. 2, fig. 3, and fig. 6, in order to facilitate the movement of the first elastic member 4, the first elastic member 4 responds to the diaphragm 5 quickly (reduce the force of the first elastic member 4 different from that in the axial direction), for example, the valve body 1 is further provided with a boss 13 on the side close to the second groove 10, the boss is in a structure that the valve body protrudes inward and protrudes toward the bonnet, the boss 13 is provided with a passage chamber 19 communicating with the first passage 7, the boss inside forms a part of the first passage (passage chamber 19), and an annular groove is formed between the outside and the inner wall of the valve body 1. During the application, on the boss was located to first elastic component cover, the one end butt of first elastic component was at the tank bottom of ring channel, and the valve gap end of keeping away from of other end butt diaphragm, the ring channel can be used for the one end of fixed first elastic component (with ring channel bottom butt), avoids first elastic component to keeping away from valve gap one side and removes. In addition, the outer wall of the boss can be moved along the first elastic part, and the boss plays a role of a guide rod so as to reduce the radial deviation of the first elastic part 4, avoid the resultant force of the movement of the first elastic part 4 along the axial direction to be reduced, and further influence the deformation of the diaphragm.
It should be noted that, in order to fix the diaphragm conveniently, for example, the inner side of the valve body 1 is sequentially provided with a first portion having a first diameter and a second portion having a second diameter from the side of the valve body 1 engaged with the bonnet 3 to the direction of the first groove 9, and the first diameter is larger than the second diameter, so that the diaphragm 5 abuts on the table top of the transition from the first portion to the second portion (the side of the diaphragm 5 close to the main valve element 2 is closely attached to the main valve element 2). The peripheral extension side of the diaphragm 5 is tightly attached to the table top, the table top and the valve cover 3 are close to the end face of one side of the diaphragm 5, and the diaphragm 5 is clamped between the table top and the end face, so that the extension side is fixed in the peripheral extension side, and the stability of the diaphragm 5 is improved. In addition, in order to facilitate deformation of the diaphragm 5 (the portion of the middle portion of the diaphragm 5 not sandwiched between the table and the end face), the diaphragm 5 is a metal thin plate having elasticity. In addition, the table top is provided with a plurality of protruding strips arranged in the radial direction (for example, the protruding strips are uniformly arranged on the table top, the number of the protruding strips can be 3, and the included angle between adjacent protruding strips is 120 °), the diaphragm 5 is provided with a concave part for matching with the protruding strips, and the protruding strips and the concave part realize concave-convex matching, so that on one hand, the diaphragm 5 can be prevented from moving axially along the surface of the boss, and further the deformation of the diaphragm is influenced (the stress of the diaphragm is changed, namely the resultant force is reduced); on the other hand, when the pressure exerted by the gaseous medium and the diaphragm increases, causing the contraction of the diaphragm, i.e. the extension of the diaphragm towards the central side of the diaphragm, the diaphragm recovers along the raised strips (corresponding to the rails) when the pressure decreases.
In the present embodiment, in order to reduce contact between the main valve element 2 and the bonnet 3 and avoid damage to the bonnet 3 caused by frequent contact between the main valve element 2 and the bonnet 3, the bonnet 3 is further provided with, for example, a recess 22, a second elastic member 23, and a sub-valve element 24. The recess 22 is located in the middle of the bonnet 3 and faces the main valve element 2, the second elastic element 23 and the sub-valve element 24 are located inside the recess 22, one end of the second elastic element 23 abuts against the bottom surface of the recess 22, and the other end is connected with the sub-valve element 24. Second elastic member 23 is used to apply pressure to auxiliary spool 24 so that auxiliary spool 24 closes passage hole 11 of main spool 2. The cross-sectional end faces of both ends of the auxiliary valve core 24 tangent to the axis of the auxiliary valve core 24 are convex, one side of the large end is connected with the main valve core 2, and one side of the small end is connected with the second elastic part 23. For example, the large end side of the sub-spool 24 may be always located within the recess 22 during movement of the sub-spool 24. In order to improve the stability of the movement of the sub-spool 24, for example, the large-end circumferential surface of the sub-spool 24 and the inner surface of the recess 22 abut against each other and can freely move along the inner surface of the recess 22.
Further, in order to facilitate the gas medium to drive the sub-valve body 24 to move, the axis of the sub-valve body 24 and the axis of the first passage 7 coincide with each other, and one end of the sub-valve body 24 abuts on the main valve body 2. In the whole process, the gas medium applies pressure to the auxiliary valve element 24, so that the auxiliary valve element 24 moves towards the side of the concave part 22, a gap is formed between the main valve element 2 and the auxiliary valve element 24 (the gas medium applies sufficient pressure to the auxiliary valve element 24), and the gas medium can enter the cavity 14 through the second channel 8, the channel hole in the main valve element and the gap between the main valve element and the auxiliary valve element.
In addition, in order to enable the gas medium to rapidly enter the first channel through the second channel 8, for example, the second channel 8 may be designed to be a bent structure, that is, the second channel 8 includes a fourth channel arranged in parallel with the first channel and a fifth channel connected to the fourth channel, one end of the fifth channel is communicated with the channel hole, and an included angle between an axis of the fourth channel and an axis of the fifth channel is 100 °, 110 ° and 120 °.
In addition, for convenience of installation and disassembly, for example, the circumferential outer surface of the valve cover 3 is provided with an external thread, and the inner side of the valve body 1 is provided with an internal thread matched with the external thread. In order to facilitate the mounting of the bonnet 3 while reducing the weight of the bonnet 3, for example, the bonnet 3 has a cylindrical structure matching the inside of the valve body 1.
In this embodiment, the first elastic member 4 and the second elastic member 23 are springs, and the locking member 6 is a locking nut.
The above embodiments may be combined with each other with corresponding technical effects.
The above description is only an exemplary embodiment of the present invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A pilot operated safety valve structure is characterized in that the structure comprises a valve body, a main valve core, a valve cover, an elastic diaphragm and a locking piece, wherein,
the inner side of the valve body is provided with a first channel for gas medium to circulate, a second channel and a third channel with the extending direction different from that of the first channel, the two ends of the valve body are respectively provided with a first groove and a second groove which are sunken towards the center of the valve body, and the first groove and the second groove are communicated through the first channel;
the main valve core is positioned on the inner side of the valve body, the first end of the main valve core is positioned in the first groove, the second end of the main valve core penetrates through the first channel, a channel hole communicated with the second channel is formed in the main valve core and on one side, close to the second groove, of the main valve core, and one end, far away from the second channel, of the channel hole is communicated with the second groove;
the valve cover is fixedly connected with the valve body, a cavity is defined by the valve cover and the second groove, an exhaust hole is formed in the valve cover, and the aperture of the exhaust hole is smaller than that of the channel hole;
the diaphragm and the locking piece are positioned in the cavity, the diaphragm and the locking piece are sleeved on the main valve core respectively, the diaphragm is fixedly arranged on the main valve core through the locking piece, and the diaphragm abuts against the bottom of the second groove along the outer end face in the circumferential direction;
and opening air flows into the cavity through the third channel and the channel hole, and back pressure is applied to the diaphragm to push the main valve core to open the valve inlet.
2. The pilot operated safety valve structure according to claim 1, wherein the main valve core includes a first valve core portion and a second valve core portion which are integrally formed, the first valve core portion and the second valve core portion have a cylindrical outer shape, the first valve core portion has a diameter larger than a bore diameter of the first passage, and a circumferential outer surface of the second valve core portion abuts against an inner wall of the first passage and is freely movable inside the first passage; the first valve core part is attached to or separated from the groove bottom of the first groove, so that the first channel and the third channel are closed or communicated.
3. The pilot-operated safety valve structure according to claim 2, wherein the second valve core portion is provided at least at two seal rings on a circumferential surface thereof, and the two seal rings are disposed on both sides of a portion where the second passage communicates with the passage hole.
4. The pilot operated safety valve structure according to claim 3, wherein the first passage wall is provided with an annular inner groove for fitting and fixing the seal ring, an inner side of the seal ring abuts against an outer surface of the second valve core portion, and an outer side of the seal ring is located in the annular inner groove.
5. The pilot operated safety valve structure according to claim 2, wherein the first spool portion is provided with an annular sealing gasket and an annular groove for fitting and fixing the annular sealing gasket on a side thereof close to the bottom of the first groove.
6. The pilot operated safety valve structure according to claim 1, wherein the valve body is further provided with a boss for limiting the diaphragm, the boss is configured such that the valve body protrudes inward and protrudes toward the valve cover, an inner side of the boss forms a part of the first passage, and an outer side thereof forms an annular groove with an inner wall of the valve body.
7. The pilot-operated safety valve structure according to claim 1, wherein the valve body is provided with a first portion having a first diameter and a second portion having a second diameter in order from a fitting side with the bonnet to an inner side of the first recess, the first diameter being larger than the second diameter, so that the diaphragm abuts on a land where the first portion transitions to the second portion.
8. The pilot-operated safety valve structure according to claim 1, wherein the bonnet is further provided with a recess portion that is provided in a middle portion of the bonnet and that faces the main spool, a second elastic member and the sub-spool are located inside the recess portion, one end of the second elastic member abuts against a bottom surface of the recess portion, and the other end is connected to the sub-spool; the second elastic member is used for applying pressure to the auxiliary valve core so that the auxiliary valve core closes the passage hole of the main valve core.
9. The pilot operated safety valve structure according to claim 8, wherein an axis of the sub-spool and an axis of the first passage coincide with each other.
10. The pilot operated safety valve structure according to claim 8, wherein the valve cover is provided with an external thread on an outer circumferential surface thereof, and an internal thread matching the external thread is provided inside the valve body; the valve cover is of a cylindrical structure matched with the inner side of the valve body; the second elastic piece is a spring; the locking piece is a locking nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123050712.9U CN217030095U (en) | 2021-12-07 | 2021-12-07 | Pilot-operated type safety valve structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123050712.9U CN217030095U (en) | 2021-12-07 | 2021-12-07 | Pilot-operated type safety valve structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217030095U true CN217030095U (en) | 2022-07-22 |
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ID=82440801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123050712.9U Active CN217030095U (en) | 2021-12-07 | 2021-12-07 | Pilot-operated type safety valve structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217030095U (en) |
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2021
- 2021-12-07 CN CN202123050712.9U patent/CN217030095U/en active Active
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