CN104455584A - Main water feed check valve - Google Patents
Main water feed check valve Download PDFInfo
- Publication number
- CN104455584A CN104455584A CN201410681003.6A CN201410681003A CN104455584A CN 104455584 A CN104455584 A CN 104455584A CN 201410681003 A CN201410681003 A CN 201410681003A CN 104455584 A CN104455584 A CN 104455584A
- Authority
- CN
- China
- Prior art keywords
- valve
- piston
- feed check
- main water
- water feed
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention relates to a main water feed check valve. The main water feed check valve belongs to the technical field of nuclear valves. According to the main water feed check valve, a valve body and a valve deck are in fastening connection through a middle flange stud and a middle flange nut, a spirotallic gasket is clamped in the middle joint part of the valve body and the valve deck for sealing, a pendant collet is inlaid between a damping plate and a lower fixing ring in the valve body, and is fixed by a bolt. After a valve clack is fixed with a piston and a piston ring, a damping chamber is formed by the valve clack and the damping plate, the upper end of the damping chamber is connected with the external of an outlet cavity of the valve body through a pressure-equalizing pipe. The main water feed check valve has the advantages that a casting blank structure is adopted by the nuclear grade main water feed check valve, the spirotallic gasket is clamped in the middle joint groove of the valve body and the valve deck to play a function of sealing, the piston is arranged at the upper portion of the valve clack, the damping plate is inlaid in the middle cavity between the valve clack and the piston, when the valve clack is closed, the piston moves downwards to compress the medium in the cavity, the discharge velocity of the medium is controlled by a circular seam gap between the damping plate and the valve clack to ensure that the valve closing time is 1-2 seconds, so that the occurrence of a water hammer is avoided.
Description
technical fieldmain feed check (valve), belongs to nuclear power valve technical field.
background techniquesafety valve is requisite equipment in nuclear plant safety emergency system, under in accident, a situation arises, requirement is opened fast, guarantee the normal input of safety system, the existing defects of conventional security valve design own, effectively cannot alleviate and prevent design basis accident and serious accident; Core level main feed check (valve) is used in nuclear power more and assists in factory on main feed water pipe line, and what prior art adopted is Y-shaped lifting check valve, and its defect is undamped plate and plunger designs, cannot avoid the generation of water hammer when the control valve shut-in time; When main feed pump is stopped transport, main refunding from steam generator to water and steam flow to main feed water pipe line, causes multiple stage steam generator emptying.
summary of the inventionin view of the defect that prior art exists, the object of this invention is to provide a kind of damping structure that increases and avoid water hammer to control shut-in time, bigbore main feed check (valve).
For achieving the above object, the technology used in the present invention solution is: main feed check (valve), valve body and valve gap are fastenedly connected by middle flange stud and middle flange nut, valve body and the middle connecting part of valve gap press from both sides a spirotallic gasket and seal, pendant collet is embedded between damping plate in valve body and lower retainer ring, and be fixed with bolt, flap top is provided with piston, flap and piston and piston ring fixing after and damping plate form damping chamber, damping chamber upper end is connected with valve outlet exterior thereto by pressure-equalizing pipe.
Main feed check (valve), its beneficial effect is: core level main feed check (valve) valve body adopts casting blank structure, valve body and valve gap are fastenedly connected by bolt and nut, valve body and valve gap middle engagement groove inner clip one spirotallic gasket seal, flap top is provided with piston, damping plate is studded with in cavity in the middle of flap and piston, when flap is closed, medium in the downward compression chamber of piston, the control media velocity of discharge is carried out with the circumferential weld gap between damping plate and flap, ensure that the valve closing time is 1 ~ 2 second, avoid the generation of water hammer.
Accompanying drawing explanation
Fig. 1 is the sectional drawing of main feed check (valve);
Fig. 2 is dampening chamber's enlarged view of main feed check (valve);
Fig. 3 is the overall appearance figure of main feed check (valve);
Procedure chart when Fig. 4 is valve opening;
Procedure chart when Fig. 5 is valve closing.
Fig. 1, Fig. 2, Fig. 3 reference character is as follows: 1, valve body, and 2, flap, 3, lower retainer ring, 4, pendant collet, 5, damping plate, 6, bolt, 7, piston, 8, piston ring, 9, locking nut, 10, spirotallic gasket, 11, valve gap, 12, middle flange stud, 13, middle flange nut, 14, pressure-equalizing pipe, 15, damping chamber.
Embodiment
With reference to the accompanying drawings the structural drawing of main feed check (valve) is described as follows below: main feed check (valve), valve body 1 and valve gap 11 are fastenedly connected by middle flange stud 12 and middle flange nut 13, valve body 1 and the middle connecting part of valve gap 11 press from both sides a spirotallic gasket 10 and seal, pendant collet 4 is embedded between damping plate 5 in valve body 1 and lower retainer ring 3, and be fixed with bolt 6, flap 2 top is provided with piston 7, flap 2 is with piston 7 and piston ring 8 is afterwards fixing and damping plate 5 forms damping chamber 15, damping chamber 15 upper end is connected with valve body 1 outlet chamber is outside by pressure-equalizing pipe 14.
It is up that valve promotes flap under the effect of medium, and the medium of damping chamber upper end flows in outlet chamber by pressure-equalizing pipe, and damping chamber lower end also has medium to flow into by circumferential weld gap simultaneously, valve open.
When main feed pump is stopped transport, can prevent main refunding from steam generator to water and steam from flowing to main feed water pipe line.In addition, when there is main feedwater line break accident, main feed check (valve) can prevent multiple stage steam generator emptying.The percussion that main feed check (valve) also produces for preventing water hammer from causing pressure surge.
When flap is closed, medium in the downward compression chamber of piston, carrys out the control media velocity of discharge with the circumferential weld gap between damping plate and flap, controls flap downstream rate, ensure that the valve closing time is 1 ~ 2 second, avoid the generation that flap fast downlink causes water hammer.
Claims (1)
1. main feed check (valve), it is characterized in that: valve body and valve gap are fastenedly connected by middle flange stud and middle flange nut, valve body and the middle connecting part of valve gap press from both sides a spirotallic gasket and seal, pendant collet is embedded between damping plate in valve body and lower retainer ring, and be fixed with bolt, flap top is provided with piston, flap and piston and piston ring fixing after and damping plate form damping chamber, damping chamber upper end is connected with valve outlet exterior thereto by pressure-equalizing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410681003.6A CN104455584A (en) | 2014-11-25 | 2014-11-25 | Main water feed check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410681003.6A CN104455584A (en) | 2014-11-25 | 2014-11-25 | Main water feed check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104455584A true CN104455584A (en) | 2015-03-25 |
Family
ID=52902107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410681003.6A Pending CN104455584A (en) | 2014-11-25 | 2014-11-25 | Main water feed check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104455584A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838387A (en) * | 2017-04-05 | 2017-06-13 | 李祥庆 | The assembly method of protecting against shock lift check valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2283763Y (en) * | 1996-08-07 | 1998-06-10 | 徐政喜 | Slowly closed adjustable check valve |
| CN200978995Y (en) * | 2006-04-12 | 2007-11-21 | 上海亚核阀业成套有限公司 | Open to air check valve |
| CN202659991U (en) * | 2012-05-31 | 2013-01-09 | 福建海洋铜业有限公司 | Slow-closing check valve |
| CN103759050A (en) * | 2014-01-17 | 2014-04-30 | 哈电集团哈尔滨电站阀门有限公司 | Novel check valve controlled to be closed |
| JP2014156883A (en) * | 2013-02-15 | 2014-08-28 | Kayaba Ind Co Ltd | Solenoid valve |
-
2014
- 2014-11-25 CN CN201410681003.6A patent/CN104455584A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2283763Y (en) * | 1996-08-07 | 1998-06-10 | 徐政喜 | Slowly closed adjustable check valve |
| CN200978995Y (en) * | 2006-04-12 | 2007-11-21 | 上海亚核阀业成套有限公司 | Open to air check valve |
| CN202659991U (en) * | 2012-05-31 | 2013-01-09 | 福建海洋铜业有限公司 | Slow-closing check valve |
| JP2014156883A (en) * | 2013-02-15 | 2014-08-28 | Kayaba Ind Co Ltd | Solenoid valve |
| CN103759050A (en) * | 2014-01-17 | 2014-04-30 | 哈电集团哈尔滨电站阀门有限公司 | Novel check valve controlled to be closed |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106838387A (en) * | 2017-04-05 | 2017-06-13 | 李祥庆 | The assembly method of protecting against shock lift check valve |
| CN106838387B (en) * | 2017-04-05 | 2019-01-25 | 纽曼（盐城）阀门制造有限公司 | The assembly method of protecting against shock lift check valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |