CN100490019C - Nulcear-cascade pressure stabilizer electric pressure-release valve - Google Patents
Nulcear-cascade pressure stabilizer electric pressure-release valve Download PDFInfo
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- CN100490019C CN100490019C CNB2006100788960A CN200610078896A CN100490019C CN 100490019 C CN100490019 C CN 100490019C CN B2006100788960 A CNB2006100788960 A CN B2006100788960A CN 200610078896 A CN200610078896 A CN 200610078896A CN 100490019 C CN100490019 C CN 100490019C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The present invention belongs to a valve, specifically relates to a nuclear stair voltage stabilizer electromotion relief valve. Its characteristics are as following: The spool is connected with valve stem by screw thread screw thread with preventing rotating annul, , the structure is firm, and easy to remove, install and maintain, there's radial clearance between spool and valve stem, so spool can rotate slightly, it can make up the angle processing error of partnership seal surface and cumulate error in assemblage, and is well sealed; Forge valve deck and bracket integratively(intergration), remove the original bracket, install electromotion device to the valve deck directly, so the whole va;ve body is with compact structure, high reliability , it also can reduce the height and weight of overall unit, improve thenatural frequency of vibretion and vibretion resistance of valve. The present invention can be applied to overpressure protection of the nuclear power station forced water cooling system(RCS), and to limit the pressure of RCS, thereby protect the pipelines and equipments of RCS.
Description
Technical field
The invention belongs to a kind of valve, be specifically related to a kind of pressure-release valve.
Background technology
Nulcear-cascade pressure stabilizer electric pressure-release valve (claiming nuclear one-level stabilizer electric throttling valve again) belongs to one of nuclear power station critical valves; be arranged on voltage stabilizer top, implement the overpressure protection of nuclear power plant's presurized water reactor cooling system (RCS) and be used for limitting the pressure of RCS with pressurizer safety valve.When secondary circuit lost hot trap, (Fleed-operational mode bleed) derived the decay heat of reactor to utilize safety injection pump and electronic pressure-release valve to implement a loop transient state drainage; Under the major accident of core meltdown, utilize electronic pressure-release valve fast implementation prompt drop to press, in case the molten heap of high pressure, thereby pipeline and the equipment of RCS is played the safeguard protection effect.Under accident conditions, adopt manually or electronic pressure-release valve is opened, closed in remote control, the steam/liquid-vapor mixture/liquid on voltage stabilizer top is drained into the release case, make the RCS step-down.
The nulcear-cascade pressure stabilizer electric pressure-release valve technical requirement is tight, safety coefficient is high, domesticly still do not possess design, manufacturing capacity, be developed country to my blockade on new techniques, with the product of expensive price earning juice, and also there is following technological deficiency in the product of external import:
1. the spool of valve is threaded with the general employing of being connected of valve rod, wears pin then and fixes (as shown in Figure 3).Though this connection is reliable, but because pin is joined work, so it is just relatively more difficult to wear pin after the dismounting again, maintenanceability is bad, and the dismounting maintenance is inconvenient, and spool closely is fixed on the valve rod, there are not small rotation and radial play, do not have the automatic fine tuning function, can not remedy the angle mismachining tolerance of matched seal face and the cumulative errors in the assembling, the manufacturability of processing and assembling is bad.
2. valve is provided with valve gap and support, and valve gap and support are separate types, structure is not compact, the middle leak-off connection of filler is above middle flange nut in the valve gap, influenced the wrench space of middle flange nut, and the valve whole height is than higher, and upper shift of gravity center has reduced the natural frequency of vibration and the anti-seismic performance of valve.
Summary of the invention
The purpose of this invention is to provide a kind of spool and the valve rod dismounting is easy to maintenance, have the automatic fine tuning function, the valve compact overall structure, in light weight, the nulcear-cascade pressure stabilizer electric pressure-release valve that the natural frequency of vibration and anti-seismic performance are good.
The present invention is achieved in that a kind of nulcear-cascade pressure stabilizer electric pressure-release valve, it comprises valve body, the valve seat pad, valve seat, sleeve, spool, valve rod, middle flange gasket, filler, leak-off connection in the middle of the filler, middle flange double-screw bolt/nut, valve gap, electric device and stem nut, valve gap is the bolt flange valve gap, be installed on the valve body by middle flange double-screw bolt/nut, by flange gasket sealing in compressing, and be reserved with lip side weld structure, between valve body and the valve seat by compressing the valve seat gasket seal, between valve rod and the valve gap by packing seal, valve rod and stem nut mesh by acme thread, valve rod and spool are for being threaded, wherein, the head of said valve rod has the anti-rotation groove that processes, be provided with the stop pin that reasonable clearance is arranged with it in this groove, stop pin and gap between the anti-rotation groove are be threaded with spool 1/6～1/2 times of pitch of valve rod, and said electric device directly is installed on the valve gap, and leak-off connection is installed on the middle flange cylindrical of valve gap in the middle of the filler.
Compare with existing external imported product, remarkable advantage of the present invention is that spool adopts being threaded of band stop pin with valve rod, reliable in structure, dismounting is easy to maintenance, and spool has small rotating and radial play relative to valve rod, can remedy the angle mismachining tolerance of matched seal face and the cumulative errors in the assembling, better sealing property is arranged; Adopt valve gap and rack integral forging, cancelled original support, electric device directly is installed on the valve gap, make the valve body compact overall structure, the reliability height, and reduced complete machine height and weight, improved the valve natural frequency of vibration and anti-seismic performance.
Description of drawings
Fig. 1 is the structural representation of nulcear-cascade pressure stabilizer electric pressure-release valve;
Fig. 2 is the connection diagram of valve rod of the present invention and spool;
Fig. 3 is the connection diagram of external imported product valve rod and spool.
Among the figure, 1. valve body; 2. valve seat pad; 3. valve seat; 4. sleeve; 5. spool; 6. stop pin; 7. valve rod; 8. middle flange gasket; 9. filler; 10. leak-off connection in the middle of the filler; 11. middle flange double-screw bolt/nut; 12. valve gap; 13. electric device; 14. stem nut; 15. pin.
Embodiment
As depicted in figs. 1 and 2, a kind of nulcear-cascade pressure stabilizer electric pressure-release valve, it comprises valve body 1, valve seat pad 2, valve seat 3, sleeve 4, spool 5, valve rod 7, middle flange gasket 8, filler 9, leak-off connection 10 in the middle of the filler, middle flange double-screw bolt/nut 11, valve gap 12, electric device 13 and stem nut 14, valve gap 12 is the bolt flange valve gap, be installed on the valve body 1 by middle flange double-screw bolt/nut 11, by 8 sealings of flange gasket in compressing, and be reserved with lip side weld structure, seal by compressing valve seat pad 2 between valve body 1 and the valve seat 3, seal by filler 9 between valve rod 7 and the valve gap 12, valve rod 7 meshes by acme thread with stem nut 14, valve rod 7 and spool 5 are for being threaded, wherein, the head of said valve rod 7 has the anti-rotation groove that processes, be provided with the stop pin 6 that reasonable clearance is arranged with it in this groove, stop pin 6 and gap between the anti-rotation groove are be threaded with spool 5 1/6～1/2 times of pitch of valve rod 7, said electric device 13 directly is installed on the valve gap 12, and leak-off connection 10 is installed on the middle flange cylindrical of valve gap 12 in the middle of the filler.
Here, the gap between stop pin 6 and the anti-rotation groove can be 1/4 in the present embodiment for be threaded with spool 5 1/6,1/4 or 1/2 times of pitch of valve rod 7.Valve rod 7 meshes by acme thread with stem nut 14, when electric device 13 starts, stem nut 14 rotations, because valve rod 7 has rotation-preventing mechanism, can not rotate, therefore the rotation of stem nut 14 is converted to moving up and down of valve rod 7, moves up and down thereby make valve rod 7 drive spool 5, opens or closes valve.Also can utilize handwheel rotating band ovable valve stem 7 and spool 5 on the electric device 13 to move up and down, make valve play the release effect.
Valve one-piece construction of the present invention is drawn the double-deck packing seal structure of leakage, the stop valve pattern of motorized motions in the middle of adopting bolt flange valve gap, band, structure maturation, reliable; Telescopic spool internals, it is convenient to change internals; The non-threaded valve seat that is screwed into of separate type, it is convenient to change valve seat, and the quality of valve base sealing surface build-up welding and processing is more prone to guarantee simultaneously; Spool spigot surface pile-up welding hard alloy is to avoid phenomenons such as the spigot surface generation abrades and kills.The spool guiding clearance is reasonable, to avoid high temperature and the stuck phenomenon of alternating hot and cold bottom spool; Have window on the sleeve, make the discharge characteristic of valve be the equal percentage curve variation by the design of five equilibrium number percent discharge characteristic; Adopt configuration of wide sealing surface and second throttle principle, when reducing High Pressure Difference medium to the washing away of sealing surface, thereby the life-span of prolongation sealing surface.What on this basis, spool and valve rod adopted the band stop pin is threaded reliable in structure, dismounting is easy to maintenance, and spool has small rotating and radial play relative to valve rod, can remedy the angle mismachining tolerance of matched seal face and the cumulative errors in the assembling, and better sealing property is arranged; Adopt valve gap and rack integral forging, cancelled original support, electric device directly is installed on the valve gap, make the valve body compact overall structure, the reliability height, and reduced complete machine height and weight, improved the valve natural frequency of vibration and anti-seismic performance.
Nulcear-cascade pressure stabilizer electric pressure-release valve is through a series of tests, and its every performance testing index all meets technical manual book and related specifications, standard-required.The maximum opening time of valve that records by timer is 8.84 seconds, and the minimum opening time is 8.60 seconds; The maximum shut-in time is 9.14 seconds, and the minimum shut-in time is 8.53 seconds.The maximum opening time differed 0.24 second with the minimum opening time, and the maximum shut-in time differed 0.61 second with the minimum shut-in time, and opening time and shut-in time do not have big variation, illustrate that valve opening and shut-in time are all very stable, satisfy code requirement; Valve saturated vapour flow under pressure reduction 15.2MPa is 71t/h (the steam flow measured value during 10% flow area is 7136Kg/h), greater than requiring flow 65t/h, satisfy the steam flow requirement, duty parameter according to valve, coefficient of flow calculated value Kv=34.5, measured value is 35.6, meets the demands; The calculated value of the valve natural frequency of vibration is 42.1Hz, and measured value 43.75Hz meets the demands.
Claims (2)
1. nulcear-cascade pressure stabilizer electric pressure-release valve, it comprises valve body (1), valve seat pad (2), valve seat (3), sleeve (4), spool (5), valve rod (7), middle flange gasket (8), filler (9), leak-off connection (10) in the middle of the filler, middle flange double-screw bolt/nut (11), valve gap (12), electric device (13) and stem nut (14), valve gap (12) is the bolt flange valve gap, be installed on the valve body (1) by middle flange double-screw bolt/nut (11), by compressing middle flange gasket (8) sealing, and be reserved with lip side weld structure, seal by compressing valve seat pad (2) between valve body (1) and the valve seat (3), seal by filler (9) between valve rod (7) and the valve gap (12), valve rod (7) meshes by acme thread with stem nut (14), valve rod (7) and spool (5) are for being threaded, it is characterized in that: the head of said valve rod (7) has the anti-rotation groove that processes, be provided with the stop pin (6) that reasonable clearance is arranged with it in this groove, stop pin (6) and gap between the anti-rotation groove are be threaded 1/6～1/2 times of pitch of valve rod (7) and spool (5), said electric device (13) directly is installed on the valve gap (12), and leak-off connection (10) is installed on the middle flange cylindrical of valve gap (12) in the middle of the filler.
2. according to the said a kind of nulcear-cascade pressure stabilizer electric pressure-release valve of claim 1, it is characterized in that: stop pin (6) and gap between the anti-rotation groove are be threaded 1/4 times of pitch of valve rod (7) and spool (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100788960A CN100490019C (en) | 2006-05-12 | 2006-05-12 | Nulcear-cascade pressure stabilizer electric pressure-release valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100788960A CN100490019C (en) | 2006-05-12 | 2006-05-12 | Nulcear-cascade pressure stabilizer electric pressure-release valve |
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| Publication Number | Publication Date |
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| CN101070918A CN101070918A (en) | 2007-11-14 |
| CN100490019C true CN100490019C (en) | 2009-05-20 |
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| CNB2006100788960A Active CN100490019C (en) | 2006-05-12 | 2006-05-12 | Nulcear-cascade pressure stabilizer electric pressure-release valve |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102606750A (en) * | 2010-12-29 | 2012-07-25 | 大连大高阀门有限公司 | Nuclear class I electric cobalt-free modularized stop valve |
| CN102022551A (en) * | 2010-12-29 | 2011-04-20 | 大连大高阀门有限公司 | Large-diameter forged Y-style stop valve |
| CN102155581B (en) * | 2011-03-30 | 2012-07-11 | 浙江理工大学 | Multiple-sealing and split-flow decompression throttling stop valve |
| CN103591320A (en) * | 2013-11-20 | 2014-02-19 | 无锡智能自控工程股份有限公司 | Novel positioning structure for valve rod of regulating valve |
| CN104791502B (en) * | 2014-01-20 | 2017-02-22 | 浙江三花制冷集团有限公司 | Electric valve |
| CN110529642A (en) * | 2018-05-25 | 2019-12-03 | 中核苏阀科技实业股份有限公司 | A kind of throttle valve of valve with changeable valve seat |
| CN111043337A (en) * | 2018-10-12 | 2020-04-21 | 中核苏阀科技实业股份有限公司 | Nuclear first-stage quick opening and closing isolating valve |
| CN111043319A (en) * | 2018-10-12 | 2020-04-21 | 中核苏阀科技实业股份有限公司 | Nuclear safety second-stage pneumatic stop valve |
| CN111043334A (en) * | 2018-10-12 | 2020-04-21 | 中核苏阀科技实业股份有限公司 | Nuclear safety first-stage pneumatic stop valve |
| CN111043342A (en) * | 2018-10-12 | 2020-04-21 | 中核苏阀科技实业股份有限公司 | Nuclear-grade pneumatic gate valve |
| CN111237539A (en) * | 2020-01-20 | 2020-06-05 | 重庆川仪调节阀有限公司 | Valve rod and valve plug connecting structure and assembling method |
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2006
- 2006-05-12 CN CNB2006100788960A patent/CN100490019C/en active Active
Non-Patent Citations (2)
| Title |
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| 核电站用阀门. 张云龙.阀门，第1期. 2004 |
| 核电站用阀门. 张云龙.阀门，第1期. 2004 * |
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| CN101070918A (en) | 2007-11-14 |
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Address after: 215129 No. 501, Suzhou New District, Jiangsu, Suzhou, Zhujianglu Road Patentee after: CNNC SUFA TECHNOLOGY INDUSTRY Co.,Ltd. Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: 215129 No. 501, Suzhou New District, Jiangsu, Suzhou, Zhujianglu Road Patentee before: CNNC SUFA TECHNOLOGY INDUSTRY Co.,Ltd. Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE |