CN201206647Y - Rising-down check valve for nuclear 1 - Google Patents
Rising-down check valve for nuclear 1 Download PDFInfo
- Publication number
- CN201206647Y CN201206647Y CNU2008201144734U CN200820114473U CN201206647Y CN 201206647 Y CN201206647 Y CN 201206647Y CN U2008201144734 U CNU2008201144734 U CN U2008201144734U CN 200820114473 U CN200820114473 U CN 200820114473U CN 201206647 Y CN201206647 Y CN 201206647Y
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- China
- Prior art keywords
- valve
- flap
- valve body
- hole
- guide surface
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- Expired - Lifetime
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Abstract
The utility model belongs to a valve, particularly to a nuclear level lift check valve including a valve body and a valve cap arranged at the upper part of the valve body; a spiral wound gasket seal is arranged between the valve body and the valve cap; the valve body and the valve cap are fixedly connected through a middle flange nut, a middle flange screw stud and a double-ear check washer; a valve clack is arranged in the valve body; the seal surface at the bottom end of the valve clack is a spherical surface; the spherical surface seal surface of the valve clack is in linear contact with the valve body; a horizontal through-hole is formed at the middle part of the valve clack; and a vertical hole communicated with the horizontal through-hole is formed at the upper part of the horizontal through-hole and communicated with the inner cavity of the valve body. In the utility model, the valve clack and the valve body adopt the spherical surface seal, the required seal force is small, the leak tightness and the low differential pressure starting performance can be satisfied at the same time, the valve jam in starting and closing can be prevented, and the seal leakage rate of the valve with the spherical surface seal structure is zero.
Description
Technical field
The utility model belongs to a kind of valve, is specifically related to a kind of nuclear one-level Lift check valve that is applicable to million kilowatt nuclear power station safety injection system, is installed on the containment inboard.
Background technique
At present, adopt the structure of plane or conical surface seal between the flap of nuclear one-level Lift check valve and the valve body usually.It is bigger that these two kinds of sealing surface patterns reach the required sealing force of sealing effect, is difficult to satisfy the low differential pressure sealability.
The producer that has solves the low differential pressure sealing problem by add spring on the flap of safety check, but the possibility that spring exists the long-time meeting of use to lose efficacy, and after having added spring, increased the opening force of flap, be difficult to satisfy low differential pressure and open performance.
Therefore, flap and the sealing configuration between the valve body of examining the employing of one-level Lift check valve at present are difficult to satisfy simultaneously low differential pressure sealing and low differential pressure unlatching performance, and when opening and closing bite may take place.
Summary of the invention
The purpose of this utility model is to provide a kind of nuclear one-level Lift check valve, and the required sealing force of this valve is little, can satisfy the sealability and the low differential pressure of low differential pressure simultaneously and open performance, and can prevent the bite of valve when opening and closing.
Realize the technological scheme of the utility model purpose: a kind of nuclear one-level Lift check valve, it comprises valve body and is positioned at the valve gap on valve body top, be provided with the spiral wound gasket sealing between valve body and the valve gap, fixedly connected with lock washer with double ears by middle flange nut, middle flange double-screw bolt between valve body and the valve gap, be provided with flap in the valve body, the sealing surface of flap bottom is a sphere, contact for line between the ball face sealing face of flap and the valve body, the middle part of flap is provided with horizontal through hole, the top of horizontal through hole is provided with the vertical hole that is communicated with it, and vertically the hole is communicated with body cavity.
Be provided with the sealing surface weld deposit face between described sealing surface and the valve interior wall.
Described horizontal through hole and vertical hole are cylinder bore.
The top of described flap cylindrical body outside is provided with overlaying surface on the flap guide surface, and the bottom of flap cylindrical body outside is provided with overlaying surface under the flap guide surface; On the guide surface under overlaying surface and the guide surface overlaying surface all adopt cemented carbide.
The beneficial effects of the utility model are: for line contacts, it is littler than plane or conical surface seal that the sealing surface structure of this line contact reaches the required sealing force of sealing effect between the ball face sealing face of flap of the present utility model and the valve body; Can satisfy the sealability and the low differential pressure of low differential pressure (being lower than the pressure reduction of 0.1MPa) simultaneously and open performance, and can prevent the bite of valve when opening and closing, the valve base sealing leak-down rate of this ball face sealing structure is zero, can satisfy the requirement of nuclear one-level Lift check valve fully.Flap adopts two sections built-up welding structures when guaranteeing that the flap guiding requires, and has effectively reduced the unlatching frictional force of valve, also saves material than common one-part form built-up welding pattern; And the guide surface overlaying surface is cemented carbide, overcome the shortcoming of the easy interlock of same material, makes guide surface that harmful phenomenons such as scratch can not take place.Thereby, guaranteed the performance and the reliable in action of valve, satisfied opening and closing smooth and easy and leak requirement.And, even this structure does not add spring, also can satisfy low differential pressure and open.
Description of drawings
Fig. 1 is a kind of sectional view of examining one-level Lift check valve initialization state provided by the utility model;
Among the figure: 1. valve body; 2. flap; 3. spiral wound gasket; 4. valve gap; 5. middle flange nut; 6. middle flange double-screw bolt; 7. lock washer with double ears; A. horizontal through hole; B. vertical through hole; C. valve inlet; D. valve export; E. body cavity; F. overlaying surface on the guide surface; G. overlaying surface under the guide surface; H. sealing surface; M. sealing surface weld deposit face.
Embodiment
Below in conjunction with drawings and Examples a kind of nuclear one-level Lift check valve provided by the utility model is described in further detail.
As shown in Figure 1, a kind of nuclear one-level Lift check valve, it comprises valve body 1, flap 2, spiral wound gasket 3, valve gap 4, nut 5, double-screw bolt 6 and lock washer with double ears 7.Valve body 1 top is provided with valve gap 4, is provided with spiral wound gasket 3 sealing between valve body 1 and the valve gap 4, fixedlys connected with lock washer with double ears 7 by middle flange nut 5, middle flange double-screw bolt 6 between valve body 1 and the valve gap 4.Be provided with flap 2 in the valve body 1, the sealing surface H of flap 2 bottoms is a sphere, contacts for line between the ball face sealing face H of flap 2 and the valve body 1.The middle part of flap 2 is provided with horizontal through hole A, is provided with the vertical hole B that is communicated with it on the top of horizontal through hole A, and vertically hole B is communicated with body cavity E.Horizontal through hole A and vertical hole B can be cylinder bore.
Fig. 1 is a kind of nuclear one-level Lift check valve initialization view provided by the utility model, describe a kind of working principle of examining the one-level Lift check valve provided by the utility model below in conjunction with Fig. 1: working medium flows into from valve inlet C, flap 2 moves upward, the sealing surface weld deposit face M of flap 2 lower ends and valve body 1 inwall break away from fit-state, valve opening, working medium flows out from valve export D; When the pressure at valve export D place during greater than the pressure at valve inlet C place, working medium flows into from valve export D, and the part working medium enters horizontal through hole A and vertical hole B simultaneously, and flap 2 moves downward, the sealing surface weld deposit face M of flap 2 lower ends and valve body 1 inwall fit tightly valve closing.
The sealing surface H of the flap 2 of valve provided by the utility model is a sphere, adopts lathe in machining, guarantees the sphere precision.
Valve provided by the utility model can also be applied to systems such as containment spray system, safety injection system, waste heat derivation, chemical volume control system, component cooling water.
Claims (5)
1. examine the one-level Lift check valve for one kind, it comprises valve body (1) and is positioned at the valve gap (4) on valve body (1) top, be provided with spiral wound gasket (3) sealing between valve body (1) and the valve gap (4), pass through middle flange nut (5) between valve body (1) and the valve gap (4), middle flange double-screw bolt (6) is fixedlyed connected with lock washer with double ears (7), be provided with flap (2) in the valve body (1), it is characterized in that: the sealing surface (H) of flap (2) bottom is a sphere, contact for line between the ball face sealing face (H) of flap (2) and the valve body (1), the middle part of flap (2) is provided with horizontal through hole (A), the top of through hole (A) is provided with the vertical hole (B) that is communicated with it, and hole (B) is communicated with body cavity (E).
2. a kind of nuclear one-level Lift check valve according to claim 1 is characterized in that: be provided with sealing surface weld deposit face (M) between described sealing surface (H) and valve body (1) inwall.
3. a kind of nuclear one-level Lift check valve according to claim 1 and 2 is characterized in that: described horizontal through hole (A) and vertical hole (B) are cylinder bore.
4. a kind of nuclear one-level Lift check valve according to claim 1 and 2, it is characterized in that: the top of described flap (2) cylindrical body outside is provided with overlaying surface on the flap guide surface (F), and the bottom of flap (2) cylindrical body outside is provided with overlaying surface under the flap guide surface (G); Overlaying surface (G) all adopts cemented carbide under overlaying surface on the guide surface (F) and the guide surface.
5. a kind of nuclear one-level Lift check valve according to claim 3, it is characterized in that: the top of described flap (2) cylindrical body outside is provided with overlaying surface on the flap guide surface (F), and the bottom of flap (2) cylindrical body outside is provided with overlaying surface under the flap guide surface (G); Overlaying surface (G) all adopts cemented carbide under overlaying surface on the guide surface (F) and the guide surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201144734U CN201206647Y (en) | 2008-05-20 | 2008-05-20 | Rising-down check valve for nuclear 1 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201144734U CN201206647Y (en) | 2008-05-20 | 2008-05-20 | Rising-down check valve for nuclear 1 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201206647Y true CN201206647Y (en) | 2009-03-11 |
Family
ID=40465710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201144734U Expired - Lifetime CN201206647Y (en) | 2008-05-20 | 2008-05-20 | Rising-down check valve for nuclear 1 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201206647Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519438A (en) * | 2011-10-18 | 2012-06-27 | 金华职业技术学院 | Water depth measuring instrument |
| CN102620015A (en) * | 2010-12-30 | 2012-08-01 | 大连大高阀门有限公司 | Nuclear class 1 large caliber forged steel full circulation high-Cv value swing check valve |
-
2008
- 2008-05-20 CN CNU2008201144734U patent/CN201206647Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620015A (en) * | 2010-12-30 | 2012-08-01 | 大连大高阀门有限公司 | Nuclear class 1 large caliber forged steel full circulation high-Cv value swing check valve |
| CN102519438A (en) * | 2011-10-18 | 2012-06-27 | 金华职业技术学院 | Water depth measuring instrument |
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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: 20090311 |
|
| CX01 | Expiry of patent term |