CN201875217U - Pilot operated safety valve used under low temperature operating condition - Google Patents
Pilot operated safety valve used under low temperature operating condition Download PDFInfo
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- CN201875217U CN201875217U CN2010205514403U CN201020551440U CN201875217U CN 201875217 U CN201875217 U CN 201875217U CN 2010205514403 U CN2010205514403 U CN 2010205514403U CN 201020551440 U CN201020551440 U CN 201020551440U CN 201875217 U CN201875217 U CN 201875217U
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- valve
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Abstract
The utility model provides a pilot operated safety valve used under the low temperature operating condition, which comprises a main valve seat and a main valve clack, wherein the main valve seat and the main valve clack are arranged in a main valve body inner cavity, the main valve seat is connected onto the main valve body, and the main valve clack is arranged above the main valve seat; a cover plate is fixed below the main valve body; an air chamber pressure pipe is arranged on the cover plate; a pilot valve is fixed on the main valve body through a bracket; an inlet pressure pipe is arranged at the lower part of the main valve body; both a main valve sealing block and a corrugated pipe are arranged in the main valve body, the main valve sealing block is fixed at the lower part of the main valve clack, and the corrugated pipe is connected at the periphery of the main vale clack; a guide sleeve is arranged above the corrugated pipe and between the cover plate and the main valve body; one end of a temperature-rise spiral pipe II is connected with the inlet pressure pipe, while the other end is connected with an inlet of the pilot valve; and one end of the other temperature-rise spiral pipe I is connected with an outlet of the pilot pipe, while the other end is connected with the air chamber pressure pipe. At the operating temperature ranging from subzero 200 to subzero 50 DEG C, the pilot operated safety valve can be correctly started, stably discharged and timely reseated, the sealing performances of the main valve and the pilot valve are excellent, and the action performances thereof are excellent.
Description
Technical field
The utility model relates to a kind of Pilot operated safety valve that is used for the pressure system overpressure protection, is specifically related to a kind of Pilot operated safety valve that is used for worst cold case (50 ℃～-200 ℃).
Background technique
Pilot operated safety valve is specially adapted to the place of high back pressure, big flow, high pressure and mounting point compactness and uses, and its main valve just can reach full open, and be swift in motion under very little superpressure situation.Compare conventional safety valve, have the following advantages: permissible working pressure is near the Set pressure of safety valve, the valve seat soft seal guarantees the excellent sealing before and after the safety valve jumping up, and performance of safety valve and Lift are not subjected to the influence of back pressure, and less superpressure just can make main valve reach rapidly and open state entirely.
The low-temperature safety valve is widely used in industries such as empty branch, LNG, LPG, polysilicon, is a staple product branch in safety valve field, and the market demand is wide.At relevant chemical field, generally adopt in the low-temperature storage tank in particularly empty branch field and the cryogenic piping, can be used for multiple medium occasions such as oxygen, nitrogen.Than the spring Direct loaded safety valve, Pilot operated safety valve since a large amount of use of seal ring rubber o-ring, suitable temperature range is restricted, conventional Pilot operated safety valve operating temperature range can not be used for worst cold case between-50～200 ℃.
Low temperature Pilot operated safety valve operating conditions harshness, the working medium major part is the material inflammable, explosive, that permeability is strong, has compared a lot of differences with conventional valve.Compare with the normal temperature operating mode, action performance, performance index and the sealability of Pilot operated safety valve under low-temperature condition all will have very big change, bring bigger technical difficulty.Design, production and test for the low-temperature safety valve all have stricter requirement.
Summary of the invention
The purpose of this utility model is to provide a kind of and can guarantees accurate unlatching, stable emissions down and return seat, the Pilot operated safety valve with good technical performance parameter in good time at worst cold case (50 ℃～-200 ℃).
Realize the technological scheme of the utility model purpose: a kind of Pilot operated safety valve that is used for worst cold case, it comprises valve body of main valve, main valve valve seat and main valve flap are arranged on the valve body of main valve inner chamber, and the main valve valve seat is connected on the valve body of main valve, and main valve valve seat top is the main valve flap; Cover plate is fixed on the valve body of main valve top; The air chamber pressure pipe is located at corresponding main valve flap top on the cover plate; Pilot valve is fixed on the valve body of main valve by support; On the valve body of main valve bottom, be provided with the inlet pressure pipe; Wherein main valve sealing block and bellows are arranged on valve body of main valve inside together, and the main valve sealing block is fixed on main valve flap bottom, and bellows is connected main valve flap periphery; Guide pin bushing is connected between bellows top, cover plate and the valve body of main valve; Intensification volute 21 ends connect the inlet pressure pipe, and the other end connects the pilot valve inlet; Another intensification volute is held one by one and is connected the pilot valve outlet, and the other end connects the air chamber pressure pipe.
Aforesaid a kind of Pilot operated safety valve that is used for worst cold case, its described main valve sealing block is fixed on the main valve flap by fastening screw trip bolt.
Aforesaid a kind of Pilot operated safety valve that is used for worst cold case, its described main valve flap links to each other with bellows by screw thread
Aforesaid a kind of Pilot operated safety valve that is used for worst cold case, its described intensification volute two links to each other with the inlet pressure pipe by welding or thread forms; Described intensification volute one links to each other with the air chamber pressure pipe by welding or thread forms.
Aforesaid a kind of Pilot operated safety valve that is used for worst cold case, its described main valve sealing block adopts plastic materials.
Effect of the present utility model is:
The Pilot operated safety valve that is used for worst cold case described in the utility model, can solve the narrow problem of present conventional Pilot operated safety valve Applicable temperature scope, it is under operating temperature-200 ℃～-50 ℃, accurately unlatching, stable emissions and the in good time seat that returns, main valve and pilot valve favorable sealing property, performance is good, and pilot valve is in the normal temperature state, and the seal ring life-span prolongs greatly.
The utility model main valve sealing block has adopted has the good anti-cold flow and the plastic materials of creep properties, is connected with the main valve flap by screw thread, has improved the sealability of Pilot operated safety valve under worst cold case.The utility model has also used bellows structure to replace original rubber o-ring to realize sealing, and bellows links to each other with the main valve flap by screw thread, forms the inner chamber of sealing.Bellows is a metal parts, can not cause seal failure under worst cold case.Simultaneously, the utility model has used the intensification volute that the medium that enters pilot valve is heated, thereby makes pilot valve be in the normal temperature state and can proper functioning always.
Description of drawings
Fig. 1 is the Pilot operated safety valve structural representation that is used for worst cold case of the present utility model;
Fig. 2 is the Pilot operated safety valve opening state schematic representation that is used for worst cold case of the present utility model;
Among the figure: 1-main valve valve seat; 2-inlet pressure pipe; 3-intensification volute one; The 4-pilot valve; 5-air chamber pressure pipe; The 6-valve body of main valve; The 7-bellows; 8-main valve flap; 9-main valve sealing block; The 10-fastening screw trip bolt; The 11-cover plate; The 12-support; The 13-guide pin bushing; 14-intensification volute two.
Embodiment
Below in conjunction with the drawings and specific embodiments the Pilot operated safety valve that is used for worst cold case described in the utility model is further described.
As shown in Figure 1, the Pilot operated safety valve that is used for worst cold case described in the utility model mainly is made up of main valve valve seat 1, inlet pressure pipe 2, intensification volute 3, pilot valve 4, air chamber pressure pipe 5, valve body of main valve 6, bellows 7, main valve flap 8, main valve sealing block 9, fastening screw trip bolt 10, cover plate 11, support 12 and guide pin bushing 13.
Main valve valve seat 1 is installed in valve body of main valve 6 inner chambers, is connected with valve body of main valve 6 by screw thread.Main valve sealing block 9, main valve flap 8 are installed in valve body of main valve 6 inside, main valve valve seat 1 top with bellows 7, and wherein main valve sealing block 9 is fixed on main valve flap 8 bottoms by fastening screw trip bolt 10, and main valve flap 8 peripheries link to each other with bellows 7 by screw thread.Guide pin bushing 13 is installed between bellows 7 tops, cover plate 11 and the valve body of main valve 6.Cover plate 11 is by being bolted to valve body of main valve 6 tops.Pilot valve 4 is fixed on the valve body of main valve 6 by support 12.Air chamber pressure pipe 5 is located at corresponding main valve flap 8 tops on the cover plate 11.6 lower openings places are provided with inlet pressure pipe 2 at valve body of main valve.
Intensification volute 2 14 connects inlet pressure pipe 2 by welding or thread forms one end, and the other end connects pilot valve 4 inlets; Another intensification volute 1 connects pilot valve 4 outlets by welding or thread forms one end, and the other end connects air chamber pressure pipe 5.
As shown in Figure 1, when system's proper functioning, cryogenic media enters intensification volute 2 14 by inlet pressure pipe 2, rise to normal temperature by intensification volute 2 14 back medium temperatures and enter pilot valve 4 then, enter air chamber pressure pipe 5 through intensification volute 1 again by pilot valve 4, enter bellows 7 inner chambers then, bellows 7 links to each other with main valve flap 8, the medium of bellows 7 inside has produced a downward net effort on main valve flap 8, the main valve sealing block 9 that is installed on the main valve flap 8 contacts the maintenance sealing with main valve valve seat 1, make valve be in closed condition.
As shown in Figure 2, when system pressure reached Set pressure, the pilot valve of Pilot operated safety valve 4 was opened, and the pressure of bellows 7 inner chambers is by pilot valve 4 discharging decompressings, and main valve flap 8 is opened fully, and fluid is by the main valve step-down of releasing.When system pressure reduced to certain value, pilot valve 4 cut out, and made medium reenter bellows 7 inner chambers, closed main valve.
Claims (5)
1. Pilot operated safety valve that is used for worst cold case, it comprises valve body of main valve (6), main valve valve seat (1) and main valve flap (8) are arranged on valve body of main valve (6) inner chamber, and main valve valve seat (1) is connected on the valve body of main valve (6), and main valve valve seat (1) top is main valve flap (8); Cover plate (11) is fixed on valve body of main valve (6) top; Air chamber pressure pipe (5) is located at cover plate (11) and goes up corresponding main valve flap (8) top; Pilot valve (4) is fixed on the valve body of main valve (6) by support (12); The lower openings place is provided with inlet pressure pipe (2) at valve body of main valve (6); It is characterized in that: main valve sealing block (9) and bellows (7) are arranged on valve body of main valve (6) inside together, and main valve sealing block (9) is fixed on main valve flap (8) bottom, and bellows (7) is connected main valve flap (8) periphery; Guide pin bushing (13) is connected between bellows (7) top, cover plate (11) and the valve body of main valve (6); Intensification volute two (14) one ends connect inlet pressure pipe (2), and the other end connects pilot valve (4) inlet; Another intensification volute one (3) one end connects pilot valve (4) outlet, and the other end connects air chamber pressure pipe (5).
2. a kind of Pilot operated safety valve that is used for worst cold case according to claim 1 is characterized in that: described main valve sealing block (9) is fixed on the main valve flap (8) by fastening screw trip bolt (10).
3. a kind of Pilot operated safety valve that is used for worst cold case according to claim 1 is characterized in that: described main valve flap (8) links to each other with bellows (7) by screw thread.
4. a kind of Pilot operated safety valve that is used for worst cold case according to claim 1 is characterized in that: described intensification volute two (14) links to each other with inlet pressure pipe (2) by welding or thread forms; Described intensification volute one (3) links to each other with air chamber pressure pipe (5) by welding or thread forms.
5. a kind of Pilot operated safety valve that is used for worst cold case according to claim 1 is characterized in that: described main valve sealing block (9) adopts plastic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205514403U CN201875217U (en) | 2010-09-30 | 2010-09-30 | Pilot operated safety valve used under low temperature operating condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205514403U CN201875217U (en) | 2010-09-30 | 2010-09-30 | Pilot operated safety valve used under low temperature operating condition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201875217U true CN201875217U (en) | 2011-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205514403U Expired - Lifetime CN201875217U (en) | 2010-09-30 | 2010-09-30 | Pilot operated safety valve used under low temperature operating condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201875217U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076167A (en) * | 2013-01-08 | 2013-05-01 | 中国人民解放军国防科学技术大学 | Storage service life acceleration test method for pilot operated safety valve |
| CN104006191A (en) * | 2014-05-15 | 2014-08-27 | 杭州杭氧工装泵阀有限公司 | Safety valve structure with pilot arranged externally |
| CN104332206A (en) * | 2013-07-22 | 2015-02-04 | 中国核动力研究设计院 | Overpressure protection method for reactor startup/shutdown condition of PWR (pressurized water reactor) nuclear power plant |
| CN105551553A (en) * | 2015-12-15 | 2016-05-04 | 中广核工程有限公司 | Pilot type safety valve jumping monitoring device and method of PWR (Pressured Water Reactor) nuclear power station |
| CN107300027A (en) * | 2017-07-12 | 2017-10-27 | 北京航天石化技术装备工程有限公司 | A kind of pilot operated safety valve for worst hot case |
| CN110230717A (en) * | 2019-07-12 | 2019-09-13 | 乐山市前沿油气设备制造有限公司 | Pilot operated safety valve |
-
2010
- 2010-09-30 CN CN2010205514403U patent/CN201875217U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076167A (en) * | 2013-01-08 | 2013-05-01 | 中国人民解放军国防科学技术大学 | Storage service life acceleration test method for pilot operated safety valve |
| CN103076167B (en) * | 2013-01-08 | 2014-05-14 | 中国人民解放军国防科学技术大学 | Storage service life acceleration test method for pilot operated safety valve |
| CN104332206A (en) * | 2013-07-22 | 2015-02-04 | 中国核动力研究设计院 | Overpressure protection method for reactor startup/shutdown condition of PWR (pressurized water reactor) nuclear power plant |
| CN104332206B (en) * | 2013-07-22 | 2017-02-08 | 中国核动力研究设计院 | Overpressure protection method for reactor startup/shutdown condition of PWR (pressurized water reactor) nuclear power plant |
| CN104006191A (en) * | 2014-05-15 | 2014-08-27 | 杭州杭氧工装泵阀有限公司 | Safety valve structure with pilot arranged externally |
| CN105551553A (en) * | 2015-12-15 | 2016-05-04 | 中广核工程有限公司 | Pilot type safety valve jumping monitoring device and method of PWR (Pressured Water Reactor) nuclear power station |
| CN105551553B (en) * | 2015-12-15 | 2018-06-29 | 中广核工程有限公司 | Pressurized-water reactor nuclear power plant pilot operated safety valve take-off monitoring device and method |
| CN107300027A (en) * | 2017-07-12 | 2017-10-27 | 北京航天石化技术装备工程有限公司 | A kind of pilot operated safety valve for worst hot case |
| CN107300027B (en) * | 2017-07-12 | 2023-06-13 | 北京航天石化技术装备工程有限公司 | Pilot-operated safety valve for high-temperature working condition |
| CN110230717A (en) * | 2019-07-12 | 2019-09-13 | 乐山市前沿油气设备制造有限公司 | Pilot operated safety valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |
|
| CX01 | Expiry of patent term |