发明名称 |
Long-life leak standard assembly |
摘要 |
The present invention is directed to a portable leak standard assembly which is capable of providing a stream of high-purity reference gas at a virtually constant flow rate over an extensive period of time. The leak assembly comprises a high pressure reservoir coupled to a metal leak valve through a valve-controlled conduit. A reproducible leak valve useful in this assembly is provided by a metal tube crimped with a selected pressure loading for forming an orifice in the tube with this orifice being of a sufficient size to provide the selected flow rate. The leak valve assembly is formed of metal so that it can be "baked-out" in a vacuum furnace to rid the reservoir and attendent components of volatile impurities which reduce the efficiency of the leak standard.
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申请公布号 |
US4343176(A) |
申请公布日期 |
1982.08.10 |
申请号 |
US19800206222 |
申请日期 |
1980.11.12 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY |
发明人 |
BASFORD, JAMES A.;MATHIS, JOHN E.;WRIGHT, HARLAN C. |
分类号 |
G01M3/20;(IPC1-7):G01N1/00;G12B13/00 |
主分类号 |
G01M3/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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