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Two-way check valve

A technology of check valve and cut-off valve, which is applied in the field of two-way check valve, can solve the problems of inability to maintain communication, etc., and achieve the effects of compact structure, reduced package size, and reduced weight

Pending Publication Date: 2018-08-07
DALIAN DAGAO VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can only realize the function of preventing the backflow of the medium, and cannot realize the function of ensuring that the middle chamber of the gate valve is always connected with the higher pressure end of the inlet or outlet of the gate valve when it is used as a gate valve bypass valve.

Method used

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Examples

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with drawings and embodiments.

[0028] As the bypass valve of the nuclear island gate valve, the two-way check valve is a single-disc double-seat sliding type. Its function is to ensure that the middle cavity of the nuclear island gate valve is connected with the end with higher pressure at the inlet or outlet of the valve, so as to prevent the abnormality of the middle cavity of the nuclear island gate valve. Boost and pressure lock accidents occur, thus providing guarantee for the safe operation of nuclear power plants.

[0029] Such as figure 1 As shown, the two-way check valve includes a check valve part and an instrument cut-off valve part. The two-way check valve is provided with three connection ends, which are respectively the inlet end, the middle end and the outlet end. The two-way check valve passes through the reverse The stop valve disc A6 is connected to the instrument stop valve seat B...

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Abstract

The invention relates to a two-way check valve, in particular to a single-flap dual-base sliding two-way check valve with a blocking function. The two-way check valve is used as a by-pass valve of a nuclear island sluice valve, comprises a check valve part and an instrument stop valve part, is provided with three connecting ends, respectively the entry end, the middle end and the exit end, and isconnected with bases of instrument stop valve at the entry end and the exit end separately through check valve flaps; the two-way check valve can achieve that the middle end is kept to be communicatedwith the end, with higher pressure, of the valve entry end or the exit end of the valve all the time when the instrument stop valves at the two ends are kept to be opened; meanwhile, by closing the instrument stop valve at any end, the other two ends can be forced to keep communication; the two-way check valve has both the function of stop valves and the function of check valves, and particularly, when the two-way check valve is used as the by-pass valve of the sluice valve, a middle cavity of the sluice cavity is kept to be always communicated with the end, with the higher pressure, of the entry end or the exit end of the sluice valve. The two-way check valve has the function of avoiding abnormal pressure increasing in the middle cavity of the sluice valve, and guarantee is provided forsafe running of the valve.

Description

technical field [0001] The invention relates to a two-way check valve, in particular to a single-disc, double-seat sliding, two-way check valve with a cut-off function, which is used as a bypass valve of a nuclear island gate valve. Background technique [0002] Conventional check valves (check valves) are usually composed of valve body, bonnet, disc, middle flange bolts, middle flange nuts, etc. It can only realize the function of preventing the backflow of the medium, and cannot realize the function of ensuring that the middle chamber of the gate valve is always connected with the end with higher pressure at the inlet or outlet of the gate valve when it is used as a gate valve bypass valve. Contents of the invention [0003] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a two-way check valve, which is a single-flap double-seat sliding two-way check valve. Combination structure of instrument shut-off valve. [0...

Claims

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Application Information

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IPC IPC(8): F16K15/18F16K1/36F16K1/44F16K1/46F16K41/02F16K27/08
CPCF16K1/36F16K1/44F16K1/46F16K1/465F16K15/18F16K27/08F16K41/02
Inventor 王帅肖箭王伟波刘媛姜松志
Owner DALIAN DAGAO VALVE
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