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Nuclear breathing regulating valve for helium test system

A test system, a technology for pneumatic control valves, applied in the directions of lift valves, valve details, valve devices, etc., can solve problems such as pollution of the environment and leakage, and achieve the effect of increasing the reliability and safety of sealing

Inactive Publication Date: 2007-01-03
SHANGHAI AUTOMATION INSTRAION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in extreme cases where bellows seals and packing seals fail, this regulator can cause leakage
For example, it is used in the third-level nuclear safety equipment of the helium test system of Qinshan Phase III Nuclear Power Co., Ltd. The medium in the pipeline is helium containing light water, etc., which is radioactive. Once leaked to the outside, it will seriously pollute the environment.

Method used

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  • Nuclear breathing regulating valve for helium test system

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] figure 1 As shown, the nuclear-grade pneumatic regulating valve used in the helium test system is composed of a pneumatic diaphragm actuator and a bellows sealed regulating valve. The actuator of the valve adopts a ΣF actuator, which is a conventional diaphragm actuator and force The combination of the amplification system, which utilizes the principle of leverage, amplifies the output force by 2.6-5.2 times.

[0011] The valve type is an air-to-close single-seat valve. The valve body 1 is equipped with a valve seat 2, the valve core 3 in the valve seat 2 is equipped with a guide sleeve 4 in the bellows seat 5, the head of the valve core 3 is connected with a hexagonal anti-rotation shaft 6, and the upper valve cover on the bellows seat 5 9 is provided with a bellows sealing assembly 7, a packing seal 8 is provided between the upper bonnet 9 an...

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Abstract

The invention consists of a pneumatic diaphragm actuating mechanism and bellow seal control valve. A bellow seal assembly is disposed in the valve cap on the bellow seat of the control valve. Between the valve cover and the valve stem is disposed a double seal formed by the combination of the stuffing seal and between the spool and the guide sleeve is disposed a back seat sealing structure. Because of using the bellow, stuffing and back seat sealing structures, the inventive control valve can make the fluid in the pipeline not flow to the bellow assembly through the gap of the spool and the sleeve and can effectively prevent the medium in the pipeline from leaking outwards.

Description

technical field [0001] The invention relates to a pneumatic regulating valve, in particular to a pneumatic film bellows sealing regulating valve. Background technique [0002] The pneumatic film bellows sealing regulating valve is composed of a pneumatic film actuator and a bellows sealing regulating valve. Compared with ordinary control valves, its upper bonnet adopts a bellows sealing structure, which is combined with a packing seal to form a double sealing form, so it can safely and reliably prevent the process medium from leaking out from the valve stem gap, resulting in waste of resources and cause environmental pollution. Therefore, it is especially suitable for regulating highly toxic, valuable, volatile and radioactive media, and also suitable for pipeline vacuum occasions. For example, the 47 / 48-21000W pneumatic single-seat bellows sealing regulating valve produced by Shanghai Automation Instrument Co., Ltd. Automation Instrument No. 7 Factor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/00F16K41/10F16K41/02
Inventor 钱沈兵
Owner SHANGHAI AUTOMATION INSTRAION CO LTD