Valves and valve actuation – Fluid actuated or retarded – Fluid link or column actuator
Patent
1983-12-27
1985-06-04
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Fluid link or column actuator
251 5, 251 611, 251334, F16K 3112
Patent
active
045209936
ABSTRACT:
An all metal gas metering valve is used in high vacuum installations in the range of 10.sup.-9 Torr. 1/sec. to 100 Torr. 1/sec. relative to helium and 20.degree. C. ambient temperature. An axially extending tubular member forming a part of the valve housing contains a rotationally symmetrical valve body. A bushing laterally encloses at least an axially extending part of and is welded to the tubular member around two welded seams spaced apart in the axial direction of the tubular member. A pressurized medium can be charged into the joint between the inside surface of the bushing and the outside surface of the tubular member and limited by the welded seams. The pressure acting on the tubular member constricts its cross-section and reduces the space between the side surface of the tubular member and the valve body. Initially, the space between the valve body and the tubular member can be kept very small so that a wide adjustment range is available by varying the pressure acting on the tubular member.
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patent: 4310140 (1982-01-01), Boomer et al.
patent: 4395016 (1983-07-01), Welker
Novack Sheri
Schwadron Martin P.
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