IMPROVEMENTS IN VALVES FOR CONTROLLING GAS STREAMS FLOWING AT VERY LOW FLOW RATES
Valves which may be used for supplying ion sources with the desired amount of gas or for measuring the pumping rates of a molecular vacuum pump are described. The valve consists of a cylindrical metallic body which is perforated at one axial end with an opening providing a valve seat. There is a needle- forming element which is disposed axially in the interior of the body and is made of a metal or alloy having the same thermal expansion coefficient as the body. The free end of the element is capable of fitting into the valve seat and the other end is rigid with the body. There are means to admit the gas to be controlled to the interior and means for regulating the longitudinal position of the free end relatively to the seat by modifying the degree of compression of the cylindrical body in the axial direction. The regulating means consists of a first means allowing for the iritial regulation and a second means separate from the first means enabling the position, thus adjusted, to be modified with precision. Curves illustrating the results obtained with the valve are presented. (N.W.R.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-023618
- OSTI ID:
- 4056466
- Report Number(s):
- GB 872741
- Country of Publication:
- United Kingdom
- Language:
- English
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VALVES FOR CONTROLLING GAS STREAMS FLOWING AT VERY LOW FLOW RATES