Seat tightness of pneumatic cryogenic control valve

被引：0

作者：

ZHANG Ning ^{[1
]}

LI Qiang ^{[2
]}

LI Qing ^{[2
]}

HU ZhongJun ^{[3
]}

HU Kang ^{[1
]}

机构：

[1] School of Energy and Power Engineering,Huazhong University of Science and Technology

[2] State Key Laboratory of Technologies in Space Cryogenic Propellants,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences

[3] Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences

来源：

Science China(Technological Sciences) | 2013年 / 08期

关键词：

leakage rate; PCTFE; pneumatic cryogenic control valve; cryogenic system;

D O I：

暂无

中图分类号：

U464.141 [空气压缩机];

学科分类号：

080703 ;

摘要：

Pneumatic cryogenic control valves(PCCV)are designed to meet the special requirements for the large cryogenic helium refrigeration system.Polychlorotrifluoroethylene(PCTFE)is adopted as the flat seal material of the valve seat.The leakage rates and compressive strain of the PCTFE gasket with different sealing stress are tested at both room temperature(293 K)and liquid nitrogen temperature(77 K).After 300 open/close cycles,the experimental results show that the sealing properties of the PCTFE gasket are improved.The leakage rates are about 10-8(293 K)and 10-4(77 K)Pam3 s-1 respectively.Finally,the effects of working pressure on sealing characteristics are discussed.The working pressure has little effect on compressive strain but it has a great influence on leakage rate.The leakage rate is linear with the working pressure of inlet at room temperature,but at liquid nitrogen temperature the leakage rate is linear with the square of the working pressure.

引用

页码：2066 / 2069

页数：4

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