Long-life leak standard assembly. [Patent application]
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.
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- Dept. of Energy
- Patent Number(s):
- None
- OSTI ID:
- 6255152
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420200* -- Engineering-- Facilities
Equipment
& Techniques
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
CALIBRATION STANDARDS
CONTROL EQUIPMENT
DEGASSING
DESIGN
EQUIPMENT
FLOW REGULATORS
FLOWMETERS
FLUIDS
GASES
LEAK DETECTORS
LEAK TESTING
LEAKS
MASS SPECTROMETERS
MEASURING INSTRUMENTS
METERS
PRESSURE GAGES
SPECTROMETERS
STANDARDS
TESTING
VACUUM GAGES
VALVES