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Quick-closing slow closure structure of axle-flow type check valve

A check valve, axial flow technology, applied in the field of fast-closing and slow-closing structures, can solve the problem of not meeting the slow-closing requirements of the main water supply check valve, etc.

Inactive Publication Date: 2015-07-01
SHANGHAI VALVE FACTORY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the slow-closing structure of the axial-flow check valve currently available in China cannot meet the slow-closing requirements of the main feedwater check valve used in the secondary circuit of the PWR.

Method used

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  • Quick-closing slow closure structure of axle-flow type check valve
  • Quick-closing slow closure structure of axle-flow type check valve

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Embodiment Construction

[0016] In order to better understand the technical solutions of the present invention, a detailed description is given below through specific embodiments and in conjunction with the accompanying drawings:

[0017] see figure 1 , a quick-closing and slow-closing structure structure of an axial flow check valve of the present invention includes a valve flap 1, a spring 2, a guide rod 3 and a piston 7, wherein,

[0018] The valve disc 1 and the guide rod 3 are threadedly connected; the valve disc 1 and the guide rod 3 are fixed by the bolt 5 to prevent the threaded connection between the valve disc 1 and the guide rod 3 from loosening, resulting in the change of valve stroke or inaccurate guidance; A stop washer 4 is provided between the connection points to prevent the bolts from loosening and falling off. The valve disc is the opening and closing part of the valve, and the axial flow check valve realizes the connection or cut-off of the flow through the opening or closing of t...

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Abstract

The invention provides a quick-closing slow closure structure of an axle-flow type check valve. The quick-closing slow closure structure comprises a valve clack, a spring, a guide rod and a piston. The valve clack is connected with the guide rod. The spring is connected with the valve clack. The piston is arranged at the right end of the guide rod. According to the quick-closing slow closure structure of the axle-flow type check valve, on the condition that strokes of the valve clack of the check valve are identical, the valve closing time of the quick-closing slow closure structure is shorter; within the same valve closing time, the amount of media flowing backward in the check value is less; the water hammer effect of the check valve in the valve closing process is effectively reduced; the requirement of the check valve of the quick-closing slow closure structure for space of a valve cavity is lower than that of a check valve with a full-stroke piston mechanism.

Description

technical field [0001] The invention relates to a quick-closing and slow-closing structure for an axial flow check valve of a secondary circuit system of a nuclear power plant. Background technique [0002] Up to now, the existing slow-closing structure of the axial flow check valve in China uses a full-stroke piston mechanism to control the valve closing time: this slow-closing structure starts from the initial closing of the valve flap until the valve is completely closed. Doing work on the valve disc will cause the valve to close for too long, and the system medium will be poured back. However, the secondary circuit system of the nuclear power plant requires that the main feedwater check valve can be quickly closed when needed or when the pipe breaking condition occurs, and at the same time, the boost pressure generated by the water hammer effect is controlled to be as small as possible to protect the safety of the system; The amount of backflow should be as small as pos...

Claims

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Application Information

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IPC IPC(8): F16K15/02F16K47/02
CPCF16K15/02F16K15/021F16K47/02F16K47/023
Inventor 田峰周强强顾朝党顾春辉
Owner SHANGHAI VALVE FACTORY
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