Vacuum valve control device and vacuum valve

Details Vacuum valve control device and vacuum valve Vacuum valve control device and vacuum valve

1996-12-27

1999-07-06

Walton, George L.

Valves and valve actuation

Fluid actuated or retarded

Flexible wall expansible chamber reciprocating valve actuator

92 98D, 137205, 1372361, 137907, F16K 31126

Patent

active

059188537

ABSTRACT:
A vacuum valve includes a housing having an operating chamber, a plunger provided in the housing; and a self-lubricating rolling diaphragm provided between the plunger and the housing. The rolling diaphragm may have a tapered form. A vacuum valve further includes a valve rod connected to the plunger and penetrating the housing to connect with a valve body. A self-lubricating shaft seal comes into contact with the valve rod to provide an airtight seal between the housing and the valve rod.

REFERENCES:
patent: 2478575 (1949-08-01), Fitch
patent: 3043338 (1962-07-01), Hanson
patent: 3185041 (1965-05-01), Stein
patent: 3763862 (1973-10-01), Spieth
patent: 4223897 (1980-09-01), Staab et al.
patent: 4251048 (1981-02-01), Aurell
patent: 4635948 (1987-01-01), Zerfass et al.
patent: 4830232 (1989-05-01), Greenberg
patent: 4988082 (1991-01-01), Pees
patent: 5069243 (1991-12-01), Foreman
patent: 5078174 (1992-01-01), Grooms et al.
patent: 5082238 (1992-01-01), Grooms et al.
patent: 5251912 (1993-10-01), Rinne

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