CN1098431C - leakless safety valve - Google Patents
leakless safety valve Download PDFInfo
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- CN1098431C CN1098431C CN97107716A CN97107716A CN1098431C CN 1098431 C CN1098431 C CN 1098431C CN 97107716 A CN97107716 A CN 97107716A CN 97107716 A CN97107716 A CN 97107716A CN 1098431 C CN1098431 C CN 1098431C
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Abstract
The present invention belongs to a protecting device for preventing the overpressure of a reactor loop or other non-nuclear systems. The protecting device comprises a pressure-resistance valve body, a spring pressing system which acts on a valve clack to maintain sealing and is used for rapidly reducing the sealing force of the valve clack, a moveable piston which is mainly sealed by a metal diaphragm (or a corrugated pipe, or a rubber plate), a spring, a regulating screw plug for the pre-tightening of the spring, etc. The novel non-leakage safety valve can be automatically opened and closed under the direct action of a pressure medium and can be forced to be opened and closed by an electric source or a gas source. For a guide type safety valve, a subsidiary valve does not exist, the structure is simple, the reliability is high, and the problem that a main valve is not closed due to blocking solid particulates on a sealing surface of the subsidiary valve does not exist. The present invention is a novel non-leakage safety valve which has the advantages of favorable performance and long service life and can be widely used for nuclear systems and non-nuclear systems.
Description
1, technical field
The present invention relates to safety valve, particularly Leakless safety valve.
Safety valve is the requisite overpressure protection equipment of pressurized container or system that all inside fill the changeable pressure medium.
The object of the present invention is to provide a kind of can being used for the light-water is the nuclear reactor overpressure protection system of freezing mixture, can be widely used in the safety valve that uses in the non-karyonide system again.Its not auxilliary valve, and don't exist between first leaking area, be a kind of novel no leakage safety valve.Whole device reliability is good, and long service life is simple in structure, is convenient to make, thereby makes it to have better overpressure protection effect.
2, background technique
Existing safety valve has two big classes: direct-operated relief valve and indirect acting type safety valve, with regard to function, divide Safety function and release function again.
Now be used for safety valve with the nuclear reactor overpressure protection system of light water reactor freezing mixture; be generally Direct spring loaded safety valve; it is a kind of direct-operated relief valve; this safety valve is to open under the direct effect of pressure medium, and the sealing force between flap and the valve seat is active force poor of medium under the active force of flap upper spring and the flap.When pressure medium during, begin to leak because of the seal pressure of flap and valve seat is too small near the cracking pressure of safety valve.Leak between the first leaking area that is called Direct spring loaded safety valve between this pressure area of cracking pressure from beginning.The safety valve that employing is controlled the main valve unlatching with auxilliary valve is a kind of indirect acting type safety valve.The main valve clack of this safety valve is oppositely sealing, and its seal pressure increases good seal performance with the pressure of system pressure medium.When auxilliary opening of valves, enter piston upper chamber from the pressure medium in valve inlet chamber, because of the area of section of the piston effective pressure area times over main valve clack, the pressure of piston upper chamber need not rise De Taigao, just backs down main valve clack.When pressure drops to the closing pressure of auxilliary valve, auxilliary valve cuts out, and the pressure medium of piston upper chamber leaks and do not have and replenish, and pressure descends rapidly, during to the active force sum of flap, close rapidly by main valve clack less than main valve clack preloading spring and pressure medium for the active force that drops to the top main valve clack when pressure.
The indirect acting type safety valve has solved the sealing problem of main valve, if but auxilliary valve still be a Direct spring loaded safety valve, then starts to control still to exist between the first leaking area of the auxilliary valve of making usefulness and easily make the sealing surface damage.Along with the damage of sealing surface, the leakage rate aggravation, the cracking pressure deviation strengthens, and operating life shortens.
The indirect acting type safety valve that 1,000,000 kilowatts of nuclear power station of Germany use, its auxilliary valve is a Direct spring loaded safety valve.
Leak earlier for solving it; on the flap of auxilliary valve, added an electromagnetic force; during to cracking pressure; shedding electromagnetic force then could open; in case can not shed electromagnetic force on time, safety valve can not be opened on setting pressure, protected system will superpressure; this valve is to be unable to do without the outer energy to help, and the outer energy is controlled and a kind of safety valve of work.
American Electric Power research institute is disclosed indirect acting type safety valve in the Final Report of " PWR Safety and Relief Valve TestProgram " EPRI-NP2292 Project V102 in December nineteen eighty-two; (the patent No.: 87101900) guiding safety valve of China's application on March 16th, 1987, though all solved the first leakage problem of auxilliary valve, be that auxilliary valve is very high to the clarity requirement of pressure medium, wherein can not contain solid particulate matter but exist serious defective, even small particulate matter, be clipped on the sealing surface of auxilliary valve, all will cause auxilliary valve to leak, cause main valve not close than the gross leak amount, make heap one loop dehydration, the danger that reactor core is burnt is arranged.Indirect acting type safety valve with the unlatching of auxilliary valve control main valve; very high to the water quality requirement in the protected system; Japan is uninterested to it; indirect acting type safety valve structure complexity in addition; manufacture process requirement is extremely strict; the cost height, thereby be difficult to be generalized to the not so good non-karyonide system of use, particularly water quality in the non-karyonide system.
3, summary of the invention
Leakless safety valve provided by the invention, as shown in Figure 1.When valve is in running order, regulate plug screw (13) by rotation, compression-loaded spring (11), its power passes to flap (7) by valve rod (8), makes flap (7) keep sealing, and as shown in Figure 5, this power is 62KN.When the valve inlet pipe is chewed when containing pressure medium water or steam, medium makes flap (7) produce an active force that makes progress, this power increases with pressure medium, and the sealing force of flap (7) reduces with the pressure medium increase, when pressure medium rises to 17.9MPa, as shown in Figure 5, the sealing force of flap (7) drops to 15KN, meanwhile, enter the pressure medium of diaphragm (23) epicoele by connecting tube (24), make piston (17) produce a downward power, when pressure medium rises to 17.9MPa, the push rod of piston (17), push away force transmiting disk (16) is contacted with lever (15), begin lever (15) is applied active force, when pressure medium rose to 18MPa, force transmiting disk (16) acted on total power that the upwards active force of loading spring seat (10) and medium act on below the flap (7) by lever (15) and reaches 15KN.The sealing force of flap this moment (7) reduces to zero.When pressure medium increased a minimum again, the sealing surface of flap (7) and the front cover of valve seat were thrown off, and medium enters into the outlet plenum of valve through the sealing surface place, meanwhile enter the pressure medium between two sealing surfaces, made flap (7) increase a power that makes progress.Pass through appropriate design, can make this power greater than 15KN, the value that the power that surpasses can make loading spring (11) be compressed equals the Lift of the needed flap of given discharge amount (7), and when system pressure was reduced to the valve closing pressure, sealing is closed and kept to flap (7) rapidly.Thereby finish the Safety function of safety valve.As shown in Figure 1, cracking pressure can be adjusted exactly by rotation adjusting plug screw (19).Discharge capacity, be the lift of flap (7), the size of Blowdown of a safety valve value can raise platen (5) and downward modulation platen (3) and adjusting plug screw (13) and realize by adjusting.
When pressure medium is in system's operating pressure, all can implement enforced opening and positive closing at any time.As shown in Figure 1, when solenoid valve (26) is switched on, electromagnetic force is opened solenoid valve (26), from the pressurized air of pneumatic manifold (27) through solenoid valve (26), enter each piston upper chamber of multi-level piston assembly (36) respectively, piston assembly (36) is pushed away downwards the fulcrum of lever (37) on supporting disk (14) rotated up and down, ballast spring seat (10) is moved up.Flap (7) is opened under the effect of pressure medium, and the release pressure medium is when solenoid valve (26) when closing, cut off source of compressed air, the pressurized air of entering is discharged to atmosphere through solenoid valve (26), loading spring (11) pushes away and makes loading spring seat (10) downward, and flap (7) is closed.Thereby finish the pressure release function of safety valve, when flap (7) can not be closed or be not closed completely because of contingency, solenoid valve (28) energising is opened, pressurized air is by inlet house steward (27), enter each piston cavity of resorption of multi-level piston assembly (36) respectively through solenoid valve (28), piston assembly (36) is upwards drawn, the fulcrum of lever (37) on supporting disk (14) rotated up and down, ballast spring seat (10) is moved down, push away flap (7) is moved down close.Implement positive closing.
Compared with prior art; the maximum characteristics of Leakless safety valve are; not auxilliary valve; do not have because of blocking the serious problems that solid particulate matter causes main valve not close on the auxilliary valve sealing surface; next is, Leakless safety valve is simple in structure, easy to manufacture, cost is low, good reliability, be suitable for using in the various overpressure protection system.Leakless safety valve by appropriate design, can be accomplished between first leaking area to be zero fully, thereby not have the problem that causes the flap sealing surface lost efficacy by erosion destruction because of leaking earlier, thereby favorable working performance, long working life.
4, description of drawings
The present invention has following several accompanying drawings
Fig. 1 has enforced opening and positive closing function, the structure diagram of the most preferred embodiment of the Leakless safety valve of fuzing system, armament piston top employing diaphragm seal.
Fig. 2 has enforced opening and positive closing function, and it is another embodiment's the structure diagram of the Leakless safety valve of single-stage that the fuzing system, armament piston adopts sylphon seal, pneumatic piston.
Fig. 3 has enforced opening and positive closing function, and fuzing system, armament places the valve body side, and Pneumatic actuator places another embodiment's the structure diagram of the Leakless safety valve at valve top.
Fig. 4 is that fuzing system, armament places the valve top, during its piston push rod application of force, does not force in another embodiment's the structure diagram of the Leakless safety valve of loading spring seat by lever.
Fig. 5 is a Leakless safety valve sealing characteristics plotted curve, wherein has the sealing characteristics curve of Direct spring loaded safety valve.
5, embodiment
Leakless safety valve is made up of Safety function, release function and positive closing function.Safety function is made up of valve body and inner spring-loaded system and fuzing system, armament thereof.Release function and positive closing function are realized by pneumatic piston device and spring-loaded system.
As shown in Figure 1, valve seat and valve body (1) fuse, and downward modulation platen (3) is screwed on the valve seat in the mode that is threaded, rotation downward modulation platen (3), can make its upper-lower position change, set screw (4) is used for preventing its rotation, and flap (7) places in the guide cylinder (9).To raise platen (5) in the mode that is threaded twists outside guide cylinder (9), platen (5) is raised in rotation, can make its upper-lower position change, set screw (6) is used for preventing its rotation, and valve rod (8) passes the pilot hole in the guide cylinder (9), and the lower end contacts with flap (7), the upper end contacts with loading spring seat (10), regulate plug screw (13),, be screwed in the spring urceolus (12) in the mode that is threaded.The compressible loading spring of plug screw (13) (11) is regulated in rotation, and its compressive force passes to flap (7) by loading spring seat (10) through valve rod (8), becomes the sealing force of flap.Be screwed into the supporting disk (14) in the spring urceolus (12), be used to provide the strong point of lever, its upper-lower position solves by rotation supporting disk (14).Force transmiting disk (16) is enclosed within on the push rod of piston (17), keeps a gap between it and the lever (15).Regulate the mode of plug screw (19) to be threaded, twist in the inside of connecting cylinder (20), belleville spring (21) is enclosed within on the push rod of piston (17), in the top of regulating plug screw (19), plug screw (19) is regulated in rotation, make the belleville spring precompression, to adjust the cracking pressure value of safety valve, the diaphragm (23) that is used for sealing medium, by melting, its periphery is connected with connecting cylinder (20), upper cover (22) is screwed in the top of connecting cylinder (20) in the mode that is threaded, and the mode by melting welding, local and connecting cylinder (20) is welded together, to stop the pressure medium seepage, pipe insert seat (2) on connecting tube (24) lower end and the valve body (1) is to welded together, chew welded together with the pipe of upper cover (22) upper end, form one from valve inlet to seal membrane a passage between (23) epicoele, clip (18) is fixed on Pneumatic actuator on the connecting cylinder (20), lever (37) passes in the hole of pneumatic piston assembly (36) push rod, right-hand member contacts with loading spring seat (10), and the middle part bolt is on the strong point of supporting disk (14).The Pneumatic actuator cylinder body is interconnected in the mode that is threaded by upper cylinder body (30), middle cylinder body (33), lower cylinder body (35), dividing plate (32) and dividing plate (34) place between the upper, middle and lower cylinder body, the sealing that seal ring (31) is used for keeping the piston periphery.The connecting tube (25) that is come out by three-way magnetic valve (26) enters the epicoele of pistons at different levels respectively, the connecting tube (29) that is come out by three-way magnetic valve (28) enters piston cavity of resorptions at different levels respectively, pneumatic manifold (27) links to each other with three-way magnetic valve (28) with three-way magnetic valve (26) respectively, makes each parts be linked to be an integral body.
As shown in Figure 2, the main feature of its structure is the piston of fuzing system, armament (17), seals with bellows (39), and the piston of Pneumatic actuator is a single-stage.
As shown in Figure 3, the main feature of its structure is the side that fuzing system, armament places valve body, be fixed on by stationary magazine creel on the spring urceolus (12) on valve top, transmit active force from fuzing system, armament by lever (15), the piston seal in the fuzing system, armament adopts bellows (39) sealing.Pneumatic actuator places the top of valve, and the pull bar of piston moves up and down by lever (15) push-and-pull loading spring seat (10), realizes the enforced opening and the positive closing of safety valve.
As shown in Figure 4, the main feature fuzing system, armament of its structure does not pass through framework (38) by lever, will impose on from the active force of piston push rod on the loading spring seat (10), implements the unlatching of flap (7).
Claims (5)
1, a kind of Leakless safety valve, comprise valve body (1) and inner spring-loaded system thereof, fuzing system, armament, it is characterized in that fuzing system, armament places on the spring-loaded system, by end socket (22), connecting cylinder (20), seal membrane (23) is as the pressure boundary, constitute pressure chamber, making pressure chamber chew inner chamber with the valve inlet pipe by connecting tube (24) communicates, act on the medium active force on the seal membrane (23), pass to following piston (17), the push rod of piston mobile (17) passes regulates plug screw (19), link to each other with following force transmiting disk (16), belleville spring (21) is enclosed within on the push rod of piston (17), place the top of regulating plug screw (19), lever (15) is arranged on the supporting disk (14), the left end of lever (15) contacts with loading spring seat (10), right-hand member and force transmiting disk are faced each other, and are provided with in abutting connection with gap delta therebetween.
2, according to the described Leakless safety valve of claim 1, it is characterized in that it being linked to each other with Pneumatic actuator by lever (37), lever (37) can be fastened on supporting disk (14) with swinging up and down, right-hand member contacts with loading spring seat (10), left end passes the push rod of piston assembly (36), can swing up and down in company with push rod, valve body (1) and inner spring-loaded system thereof, fuzing system, armament, Pneumatic actuator constitutes the Leakless multifunctional safety valve, Pneumatic actuator is entered in the cylinder by cylinder body and multi-level piston assembly (36) and control pressurized air, implements the three-way magnetic valve (26) and three-way magnetic valve (28) the parts composition of enforced opening and positive closing.
3, according to the described Leakless safety valve of claim 1, it is characterized in that the piston in the fuzing system, armament, adopt the wavy metal seal of tube, the piston in the Pneumatic actuator is a single-stage.
4, according to the described safety valve of claim 1, it is characterized in that fuzing system, armament places the other of valve body (1) to survey, loading spring seat (10) by the interior spring-loaded system of lever (15) and valve body contacts, and Pneumatic actuator places the top of valve body (1) and spring-loaded system thereof.
5, according to the described safety valve of claim 1, the piston (17) that it is characterized in that fuzing system, armament is without lever, and through framework (38) act directly on loading spring seat (10) above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97107716A CN1098431C (en) | 1997-10-13 | 1997-10-13 | leakless safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97107716A CN1098431C (en) | 1997-10-13 | 1997-10-13 | leakless safety valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1214428A CN1214428A (en) | 1999-04-21 |
| CN1098431C true CN1098431C (en) | 2003-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97107716A Expired - Fee Related CN1098431C (en) | 1997-10-13 | 1997-10-13 | leakless safety valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1098431C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386547C (en) * | 2003-08-29 | 2008-05-07 | 赵文轩 | Safety valve for nuclear |
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| IT1401580B1 (en) * | 2010-07-29 | 2013-07-26 | Gea Niro Soavi Spa | MECHANICAL SAFETY VALVE FOR HIGH PRESSURES |
| CN102166551B (en) * | 2011-03-23 | 2012-11-14 | 烟台市芝罘振兴聚氨酯材料厂 | Anticorrosive direct spray gun for internal spraying of small-bore pipeline |
| CN102155580B (en) * | 2011-04-12 | 2012-08-29 | 浙江超达阀门股份有限公司 | Valve with bellows seal |
| CN103672115B (en) * | 2013-12-10 | 2015-09-23 | 鞍山电磁阀有限责任公司 | Sylphon seal solenoid valve |
| CN103939649B (en) * | 2014-04-03 | 2016-06-22 | 浙江方众阀门有限公司 | Self-operated type stop valve |
| CN106402073B (en) * | 2016-10-18 | 2018-02-06 | 中国核动力研究设计院 | It is a kind of by bellows pressure-sensitive and drive and with Flow amplification effect pilot valve |
| CN106286959B (en) * | 2016-10-18 | 2019-04-23 | 中国核动力研究设计院 | A kind of main valve device for pilot operated safety valve system |
| CN106402444B (en) * | 2016-10-18 | 2019-01-11 | 中国核动力研究设计院 | A kind of pilot operated safety valve system |
| CN106523748B (en) * | 2016-12-01 | 2024-04-02 | 扬中市阀门厂有限公司 | Power station relief valve of quick closing |
| CN109723897B (en) * | 2017-10-27 | 2020-10-16 | 赵斌 | Large-flux normally open normally closed electromagnetic valve |
| CN110081227B (en) * | 2019-05-29 | 2020-08-04 | 长沙理工大学 | A voltage stabilized pilot drive valve |
| CN112096937B (en) * | 2020-09-09 | 2023-01-24 | 赵斌 | Large-flux high-temperature high-pressure electromagnetic release valve |
| CN118757595B (en) * | 2024-09-03 | 2024-12-17 | 科科集团有限公司 | Self-cleaning high-performance safety valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4362183A (en) * | 1979-06-30 | 1982-12-07 | Bopp & Reuther Gmbh | Spring loaded safety valve |
| EP0341031A2 (en) * | 1988-05-04 | 1989-11-08 | Nupro Company | Valve actuator |
| US5215114A (en) * | 1990-11-28 | 1993-06-01 | Herion-Werke Kg | Safety valve |
-
1997
- 1997-10-13 CN CN97107716A patent/CN1098431C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4362183A (en) * | 1979-06-30 | 1982-12-07 | Bopp & Reuther Gmbh | Spring loaded safety valve |
| EP0341031A2 (en) * | 1988-05-04 | 1989-11-08 | Nupro Company | Valve actuator |
| US5215114A (en) * | 1990-11-28 | 1993-06-01 | Herion-Werke Kg | Safety valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386547C (en) * | 2003-08-29 | 2008-05-07 | 赵文轩 | Safety valve for nuclear |
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| Publication number | Publication date |
|---|---|
| CN1214428A (en) | 1999-04-21 |
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