CN205001587U - Full metal seal guide's formula relief valve - Google Patents
Full metal seal guide's formula relief valve Download PDFInfo
- Publication number
- CN205001587U CN205001587U CN201520631920.3U CN201520631920U CN205001587U CN 205001587 U CN205001587 U CN 205001587U CN 201520631920 U CN201520631920 U CN 201520631920U CN 205001587 U CN205001587 U CN 205001587U
- Authority
- CN
- China
- Prior art keywords
- valve
- pilot
- main valve
- main
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Fluid-Driven Valves (AREA)
Abstract
The utility model belongs to pressure system overpressure protection technique specifically discloses a full metal seal guide's formula relief valve. Constitute by main valve, pilot valve and switch. The pilot valve links to each other with main valve entry, switch entry respectively. The switch links to each other with pilot valve entry, main valve air chamber chamber, main valve export respectively. The main valve disk seat is fixed on the main valve valve body, and the main valve valve clack passes through threaded connection with the piston, main valve guide pin bushing and main valve valve body installation back, and the apron passes through bolted connection with the main valve valve body. The valve gap passes through the thread tightening on the pilot valve valve body, inside the pilot valve spring was located the valve gap, direct action was on the valve shaft, the valve cap is fixed in the valve gap top. The valve clack horizontal direction of main valve is opened or is closed, and the main valve primary seal only is sealed between disk seat and valve clack, and the possibility of effectively having avoided the main valve air chamber to reveal to the export has reduced the possible leakage point of valve in the at utmost. Adopt sealing ring structural design between main valve guide pin bushing and the valve clack, solved the piston movive seal problem under the high temperature condition.
Description
Technical field
The utility model belongs to valve gate technology, is specifically related to a kind of Pilot operated safety valve.
Background technique
Pilot operated safety valve is a kind of non-immediate action type safety valve, is made up of a main valve and pilot valve, relies on pilot valve discharge medium to drive or control bound unlatching.Guide's valve type safety valve has that permissible working pressure does not affect by back pressure close to Set pressure, performance very much, less superpressure can open rapidly entirely and the remarkable advantage such as compact structure.
Conventional Pilot operated safety valve limit due to structure, only limited seal pressure can be provided in crucial motive sealing place, the metal hard-sealing form that seal pressure requirement is higher cannot be applied, therefore existing structure sealing place a large amount of employ the nonmetallic material such as rubber o-ring or fluoroplastic.But nonmetallic material resistance to high temperature is limited, even if the perfluoroelastomers O type circle maximum operation (service) temperature that temperature tolerance is best relatively also only has 320 DEG C, significantly limit the use of Pilot operated safety valve under worst hot case.
The development of current domestic petrochemical industry, power industry rapidly, the devices such as many large-scale MTO, PX all require to use Pilot operated safety valve in a large number, and along with chemical industry high temperature and high pressure condition get more and more, conventional O type circle sealing class Pilot operated safety valve cannot be met the need of market, a kind of Pilot operated safety valve that can meet harsh worst hot case of market in urgent need design.
Summary of the invention
The purpose of this utility model is to provide a kind of all-metal sealing Pilot operated safety valve, and it can be applicable to worst hot case, and valve event reliability is high.
The technical solution of the utility model is as follows:
A kind of all-metal sealing Pilot operated safety valve, comprise main valve and pilot valve, described main valve is provided with main valve inlet and Main valve outlet, and the lower end of described pilot valve is provided with pilot valve entrance, and upper end is provided with pilot valve outlet, and pilot valve entrance is connected with main valve inlet; Also comprise switch, described switch one end is provided with switch entrance, and the other end is provided with switch outlet, and switch inside is communicated with main valve air chamber; Described switch entrance communicates with pilot valve inner chamber, and described switch outlet is connected with Main valve outlet;
Described main valve comprises valve body of main valve, is coaxially located at main valve valve seat, main valve flap, piston and main valve guide pin bushing in valve body of main valve, and is fixed on the cover plate of valve body of main valve one end; Described valve body of main valve is interior, there are main valve valve seat and main valve flap in Main valve outlet place, and piston is located on main valve flap; Described main valve air chamber is main valve guide pin bushing, piston and cover plate, and three seals the cavity surrounded; Spring is provided with, cover plate holddown spring between described piston and cover plate;
Described pilot valve comprises pilot valve valve body, the pilot valve seat be located in pilot valve valve body, the pilot valve guide pin bushing be located in pilot valve seat, the valve gap that is located at pilot valve flap in pilot valve guide pin bushing and valve shaft and is fixed with on pilot valve valve body; Described valve gap upper end is provided with adjustment screw; Compacted pilot valve spring is provided with between described adjustment screw and valve shaft; Also comprise be located in pilot valve valve body, returning seat adjustment nail, be located at back shuttle in seat adjustment nail and push rod below pilot valve seat, and be located at back the wedge that seat adjustment nails on end; Described returning between seat adjustment nail and pilot valve valve body has gap; The upper end of described push rod is positioned at the through hole of wedge; Described shuttle slides along push rod, and be stuck in back bottom shuttle seat adjustment determine inwall process inclined-plane on, close contact; The upper end of described shuttle is polyhedron, and bottom is conical surface.
In above-mentioned a kind of all-metal sealing Pilot operated safety valve: described switch is made up of housing, switch joint, switch shuttle, and shell one end is provided with switch entrance, and is provided with switch shuttle; The other end sealing is provided with switch joint, described switch joint is processed switch outlet; Described housing processing opening is communicated with main valve air chamber.
In above-mentioned a kind of all-metal sealing Pilot operated safety valve: described piston outer side wall is provided with conduit, is provided with seal ring in conduit;
In above-mentioned a kind of all-metal sealing Pilot operated safety valve: be provided with graphite pads between described main valve guide pin bushing and valve body of main valve.
In above-mentioned a kind of all-metal sealing Pilot operated safety valve: be processed with round platform in described pilot valve valve body cavity vertically, described pilot valve seat is located on round platform.
In above-mentioned a kind of all-metal sealing Pilot operated safety valve: upper spring seat is fixed in the lower end of described adjustment screw, and lower spring cup is fixed in the upper end of valve shaft, described pilot valve spring is installed by upper spring seat and lower spring cup.
In above-mentioned a kind of all-metal sealing Pilot operated safety valve: described main valve guide pin bushing is tubular structure, and itself and valve body of main valve are coaxially installed.
The beneficial effects of the utility model are:
Main valve flap is located at the inner side of main valve valve seat, is connected with piston.Piston seal is arranged in main valve leads, and guide pin bushing and piston seal, guide pin bushing and valve body of main valve seal.Effectively prevent the possibility that main valve air chamber is revealed to outlet, decrease the possible leakage point of valve to the full extent.
Adopt seal ring structure to design between main valve guide pin bushing and flap, solve the piston motive sealing problem under high-temperature condition.Opposing seal can be kept when air chamber quick pressure releasing, ensure valve motion credibility at high temperature.
The sealing of valve seat flap place have employed metal to metal sealing structure, the impact to valve clack sealing surface during in order to alleviate valve switch, and main valve flap uses with piston and is threaded, and main valve flap center processes inside groove, cushion impact forces.
Introduce switch structure, increase to the tertiary structure form of pilot valve-switch-main valve, assisted gas chamber is vented, and valve entirety is reached more rapidly and entirely opens state.
Dynamic sealing point in pilot valve all adopts metal to metal sealing structure.Return the same wedge of seat regulating nail, shuttle to combine and forms back seat performance adjusting mechanism, by the flow passage structure of adjustment pilot valve and main valve air chamber, main valve air chamber pressure is controlled, realizes the control to Pilot operated safety valve performance.
Accompanying drawing explanation
Fig. 1 is all-metal sealing Pilot operated safety valve structural representation;
Fig. 2 is pilot valve structure schematic diagram;
Fig. 3 is switch structural representation;
In figure: 1. main valve; 2. pilot valve; 3. switch; 4. valve body of main valve; 5. main valve valve seat; 6. main valve flap; 7. piston; 8. seal ring; 9. main valve guide pin bushing; 10. graphite pads; 11. main spool springs; 12. cover plates; 13. pilot valve valve bodies; 14. valve gaps; 15. bonnets; 16. adjustment screws; 17. pilot valve springs; 18. pilot valve guide pin bushings; 19. valve shafts; 20. pilot valve flaps; 21. pilot valve seat; 22. wedges; 23. shuttles; 24. push rods; 25. times seat regulating nails; 26. housings; 27. switch joints; 28. switch shuttles.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1, all-metal sealing Pilot operated safety valve is made up of main valve 1, pilot valve 2 and switch 3.Pilot valve 2 is connected with main valve inlet, switch 3 entrance respectively by pressure tube.Three passages on switch 3 utilize pressure tube to be connected with pilot valve entrance, main valve air chamber, Main valve outlet respectively.
Main valve 1 is made up of valve body of main valve 4, main valve valve seat 5, main valve flap 6, piston 7, seal ring 8, main valve guide pin bushing 9, graphite pads 10, main spool spring 11, cover plate 12.
The lower end of valve body of main valve 4 is entrance, and side is processed with outlet, and entrance and exit all communicates with main valve valve pocket.By the main valve valve seat 5 that screw fixed installation is coaxial with it in valve body of main valve 4, at the inner side of main valve valve seat 5 fixed installation main valve flap 6, main valve flap 6 is connected with piston 7 by screw thread.Piston 7 sealing is arranged in main valve guide pin bushing 9, piston 7 is installed main spool spring 11.Above-mentioned main valve guide pin bushing 9 is tubular structures that a sealing is arranged in valve body of main valve 4, and itself and valve body of main valve 4 are coaxially installed, and fixedly mounts a cover plate 12 in the outside of main valve guide pin bushing 9, and cover plate 12 and valve body of main valve 4 are bolted.Such main spool spring 11 is subject to the stop of cover plate 12, compresses main spool spring 11.The cavity that cover plate 12, main valve guide pin bushing 9 and piston 7 surround is called main valve air chamber.
Sealing between above-mentioned piston 7 and main valve guide pin bushing 9 is realized by seal ring 8, and seal ring 8 is arranged in the conduit of piston 7 outer side wall processing.Piston 7 moves axially along main valve 1 in main valve guide pin bushing 9, and seal ring 8 is squeezed and realizes sealing.Sealing between above-mentioned main valve guide pin bushing 9 and valve body of main valve 4 is realized by graphite pads 10, and graphite pads 10 is arranged in the conduit of main valve guide pin bushing 9 outer side wall processing.
Pilot valve 2 is adjusted nail 25 formed by pilot valve valve body 13, valve gap 14, bonnet 15, adjustment screw 16, pilot valve spring 17, pilot valve guide pin bushing 18, valve shaft 19, pilot valve flap 20, pilot valve seat 21, wedge 22, shuttle 23, push rod 24, time seat.
Be processed with round platform in described pilot valve valve body 13 cavity vertically, the side of pilot valve valve body 13 is processed with the entrance communicated with cavity.Relative side is processed with pilot valve entrance, as connection switch entrance.
Above-mentioned round platform is installed pilot valve seat 21, pilot valve guide pin bushing 18 is installed above pilot valve seat 21.The sidewall of pilot valve seat 21 and pilot valve guide pin bushing 18 all with the cavity wall close contact of pilot valve valve body 13.The side of pilot valve guide pin bushing 18 is processed with opening, and this opening communicates with above-mentioned entrance.
In pilot valve guide pin bushing 18, pilot valve flap 20 and valve shaft 19 are installed.Pilot valve flap 20 is positioned at the mounting groove bottom valve shaft 19, and valve shaft 19 is positioned at pilot valve guide pin bushing 18, the axial plane of its upper end and pilot valve guide pin bushing 19 close contact.Pilot valve flap 20 and pilot valve seat 21 seal installs.
Above above-mentioned pilot valve guide pin bushing 18, fixedly mount valve gap 14, the outer wall of the lower end of valve gap 14 is processed with screw thread, and it is positioned at the chamber of pilot valve valve body 13, is installed fixing by screw thread.Install pilot valve spring 17 in valve gap 14, upper end fixed installation adjustment screw 16, adjustment screw 16 is arranged on the upper end of valve gap 14 by screw thread, and passes through nut check.Upper spring seat is fixed in the lower end of adjustment screw 16, and lower spring cup is fixed in the upper end of valve shaft 19, and pilot valve spring 17 is installed by upper spring seat and lower spring cup.
By screw thread fixed installation bonnet 15 above above-mentioned valve gap 14.
Be more than the structure above the round platform in pilot valve valve body 13, the structure below round platform is as follows.
In pilot valve valve body 13, the below of round platform, install back seat adjustment nail 25.Return the tubular construction that seat adjustment nail 25 is inner processing axial hole, lower end is as the entrance connecting main valve.Return between seat adjustment nail 25 and pilot valve valve body 13 and there is gap.
In time seat adjustment nail 25, install shuttle 23 and push rod 24, shuttle 23 is stuck in back on the inclined-plane of the fixed 25 inwalls processing of seat adjustment.Wedge 22 is installed in the upper end returning seat adjustment nail 25, and wedge 22 center processing through hole, the upper end of above-mentioned push rod 24 is positioned at the through hole of wedge 22, and extend in the pilot valve seat 21 above round platform.Pilot valve valve body 13 lower surface is stretched out, the nut check be set with by outside in the lower end returning seat adjustment nail 25.
The upper end of above-mentioned shuttle 23 is hexahedron structure, certainly can also be processed into other polyhedral structures.The bottom of shuttle 23 is conical surface, when shuttle 23 be stuck in back seat adjustment nail 23 inclined-plane on time, conical surface and inclined-plane fit tightly, return seat adjustment nail 23 inner chamber to shut, after shuttle 23 moves up, conical surface is separated with inclined-plane, and the gap that shuttle 23 side and time seat adjust between nail 23 is opened.
Below the structure of switch 3 is illustrated.
Switch 3 is made up of housing 26, switch joint 27, switch shuttle 28.
Bottom housing 26, processing connects the passage of pilot valve, and switch shuttle 28 is installed in bottom, and housing 26 port installs switch joint 27, and on switch joint 27, processing connects the passage of Main valve outlet, housing 26 sidewall is processed with the passage connecting main valve gas chamber.
When the Set pressure of system pressure lower than valve, fit tightly under pilot valve seat 21 and the effect of flap 20 spring 17, keep hermetically closing, system pressure enters main valve air chamber and switch entrance by main valve 1 entrance respectively through pilot valve 2, and main valve flap 6 keeps fitting tightly with main valve valve seat 5 under the acting in conjunction of main spool spring 11 and main valve air chamber intracavity gas.Switch shuttle 28 is due to gas effect, and the same switch joint 27 that slides left fits tightly, and ensures that switch 3 is in closed condition.
When system pressure increase reaches Set pressure, the spring force that pilot valve flap 20 drives valve shaft 19 to overcome pilot valve spring 17 under the effect of stream pressure moves upward, pilot valve flap 20 leaves pilot valve seat 21, and switch shuttle 28 right atrial pressure of releasing, makes switch shuttle 28 move right, open the sealing with switch joint 27, make switch 3 be in opening state, main valve air chamber pressure reduces fast, and main valve flap 6 is by force unbalance, reach standard-sized sheet, realize delivery.
After main valve flap 6 is opened rapidly, system pressure reduces fast through Main valve outlet, and when system pressure is down to Reseating pressure of a safety valve, under pilot valve spring 17 acts on, pilot valve flap 20 and pilot valve seat 21 fit tightly again, realize sealing.System pressure reenters main valve air chamber and switch entrance, and switch shuttle 28 moves to the left, reseals with switch joint 27.Main valve air chamber constantly boosts, and main valve flap 6 moves right under the effect of air chamber pressure, and main valve flap 6 and main valve valve seat 5 return seat again, realizes sealing.
Returned the degree of depth of the screw-in pilot valve valve body 13 of seat nail 25 by adjustment pilot valve, the adjustment of returning seat performance to whole valve can be realized.Return the relative position that seat regulating nail 25 screws in pilot valve valve body 13, determine the speed degree that push rod 24 backs down pilot valve shuttle 23, and then affect the aeration speed of main valve air chamber, finally affecting main valve returns a performance.By the way, this patent all uses Structural Hardware as movable sealing structure in Pilot operated safety valve, instead of the nonmetal sealing configurations such as traditional O type circle or plastics, successfully solves the application limitation problem of pilot valve under the harsh operating mode of high temperature.
Claims (7)
1. an all-metal sealing Pilot operated safety valve, comprise main valve (1) and pilot valve (2), described main valve (1) is provided with main valve inlet and Main valve outlet, the lower end of described pilot valve (2) is provided with pilot valve entrance, upper end is provided with pilot valve outlet, and pilot valve entrance is connected with main valve inlet; It is characterized in that: also comprise switch (3), described switch (3) one end is provided with switch entrance, and the other end is provided with switch outlet, and switch (3) inside is communicated with main valve air chamber; Described switch entrance communicates with pilot valve (2) inner chamber, and described switch outlet is connected with Main valve outlet;
Described main valve (1) comprises valve body of main valve (4), is coaxially located at main valve valve seat (5), main valve flap (6), piston (7) and main valve guide pin bushing (9) in valve body of main valve (4), and is fixed on the cover plate (12) of valve body of main valve (4) one end; Described valve body of main valve (4) is interior, there are main valve valve seat (5) and main valve flap (6) in Main valve outlet place, and piston (7) is located on main valve flap (6); Described main valve air chamber is main valve guide pin bushing (9), piston (7) and cover plate (12), and three seals the cavity surrounded; Spring (11) is provided with, cover plate (12) holddown spring (11) between described piston (7) and cover plate (12);
Described pilot valve comprises pilot valve valve body (13), the pilot valve seat (21) be located in pilot valve valve body (13), the pilot valve guide pin bushing (18) be located in pilot valve seat (21), the valve gap (14) that is located at pilot valve flap (20) in pilot valve guide pin bushing (18) and valve shaft (19) and is fixed with on pilot valve valve body (13); Described valve gap (14) upper end is provided with adjustment screw (16); Compacted pilot valve spring (17) is provided with between described adjustment screw (16) and valve shaft (19); Also comprise be located in pilot valve valve body (13), the returning seat adjustment nail (25), be located at back shuttle (23) in seat adjustment nail (25) and push rod (24) of pilot valve seat (21) below, and be located at back the wedge (22) that seat adjustment follows closely (25) upper end; Described returning between seat adjustment nail (25) and pilot valve valve body (13) has gap; The upper end of described push rod (24) is positioned at the through hole of wedge (22); Described shuttle (23) slides along push rod, and shuttle (23) bottom is stuck in back on the inclined-plane of fixed (25) inwall processing of seat adjustment, close contact; The upper end of described shuttle (23) is polyhedron, and bottom is conical surface.
2. a kind of all-metal sealing Pilot operated safety valve as claimed in claim 1, it is characterized in that: described switch (3) is made up of housing (26), switch joint (27), switch shuttle (28), housing (26) one end is provided with switch entrance, and is provided with switch shuttle (28); The other end sealing is provided with switch joint (27), the outlet of described switch joint (27) upper processing switch; Described housing (26) processing opening is communicated with main valve air chamber.
3. a kind of all-metal sealing Pilot operated safety valve as claimed in claim 2, is characterized in that: described piston (7) outer side wall is provided with conduit, is provided with seal ring (8) in conduit.
4. a kind of all-metal sealing Pilot operated safety valve as claimed in claim 2, is characterized in that: be provided with graphite pads (10) between described main valve guide pin bushing (9) and valve body of main valve (4).
5. a kind of all-metal sealing Pilot operated safety valve as claimed in claim 2, is characterized in that: be processed with round platform in described pilot valve valve body (13) cavity vertically, described pilot valve seat (21) is located on round platform.
6. a kind of all-metal sealing Pilot operated safety valve as claimed in claim 2, it is characterized in that: upper spring seat is fixed in the lower end of described adjustment screw (16), lower spring cup is fixed in the upper end of valve shaft (19), and described pilot valve spring (17) is installed by upper spring seat and lower spring cup.
7. a kind of all-metal sealing Pilot operated safety valve as claimed in claim 2, is characterized in that: described main valve guide pin bushing (9) is tubular structure, and itself and valve body of main valve (4) are coaxially installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520631920.3U CN205001587U (en) | 2015-08-20 | 2015-08-20 | Full metal seal guide's formula relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520631920.3U CN205001587U (en) | 2015-08-20 | 2015-08-20 | Full metal seal guide's formula relief valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205001587U true CN205001587U (en) | 2016-01-27 |
Family
ID=55158475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520631920.3U Withdrawn - After Issue CN205001587U (en) | 2015-08-20 | 2015-08-20 | Full metal seal guide's formula relief valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205001587U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106499851A (en) * | 2015-08-20 | 2017-03-15 | 北京航天石化技术装备工程有限公司 | A kind of all-metal sealing pilot operated safety valve |
-
2015
- 2015-08-20 CN CN201520631920.3U patent/CN205001587U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106499851A (en) * | 2015-08-20 | 2017-03-15 | 北京航天石化技术装备工程有限公司 | A kind of all-metal sealing pilot operated safety valve |
| CN106499851B (en) * | 2015-08-20 | 2019-02-01 | 北京航天石化技术装备工程有限公司 | A kind of all-metal sealing pilot operated safety valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106499851A (en) | A kind of all-metal sealing pilot operated safety valve | |
| CN110671502B (en) | Water hammer resistant stop valve | |
| CN102278504A (en) | Atmosphere discharge valve | |
| KR101401086B1 (en) | Prefabricated high-pressure flow control valve | |
| CN205001587U (en) | Full metal seal guide's formula relief valve | |
| CN202182218U (en) | Back flow preventing device with controllable flow | |
| CN104747738B (en) | A kind of heavy-caliber high-temperature high pressure sleeve adjusting valve | |
| CN104514901A (en) | Plastic sealing type pilot-operated safety valve | |
| CN204420295U (en) | A kind of vacuum corrugated pipe realizes the reduction valve that delivery pressure is absolute pressure | |
| CN206801838U (en) | The more air bag clearance adjustment actuating mechanisms of reciprocating compressor | |
| CN108518491A (en) | A kind of two-way pneumatic control valve | |
| CN104482240A (en) | Nuclear-grade electric ball valve connected with magnetic driver | |
| CN112032377B (en) | Quick-response pilot operated safety valve and system overpressure quick protection method | |
| CN206988448U (en) | A kind of double spool linkage valve | |
| CN110388486B (en) | Anti-scouring composite valve group | |
| CN208651723U (en) | Vibration proof pilot operated safety valve | |
| CN203571134U (en) | Plastic sealing pilot operated safety valve | |
| CN103032579A (en) | Pressure air intake and exhaust volume amplifying device of exhaust valve | |
| CN202149228U (en) | Adjusting valve | |
| CN205918949U (en) | Pneumatic control valve | |
| CN104896111B (en) | A kind of pilot piston type stop valve for adapting to vertical duct | |
| CN210196502U (en) | Valve core and regulating valve for balancing pressure drop | |
| CN205918978U (en) | Pneumatic control valve | |
| CN211649196U (en) | Safety valve capable of adapting to large flow | |
| CN208764436U (en) | A kind of industry pressure reducing valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160127 Effective date of abandoning: 20190201 |