David Adishian

US Patent:

49955896, Feb 26, 1991

Filed:

Jan 29, 1990

Appl. No.:

7/472005

Inventors:

David Adishian - Palos Verdes Estates CA
Ira J. Silverman - Northridge CA

Assignee:

Sequioa Controls Company, Ltd. - Carson CA

International Classification:

F16K 3100

US Classification:

2513353

Abstract:

A gas flow bellows valve of low profile, low purge volume and high gas flow includes an externally pressurized bellows surrounding a stepped valve stem. A self-centering toroidal guide seals in line contact with the main valve body and a bonnet with the valve stem being translatable therein. A valve actuator includes a valve piston connected to the stem and positioned between a pair of recesses in an actuator base and an actuator removable cap. A flat wave spring is positioned in one or the other of the recesses to alternatively bias the piston and stem to a valve normally closed or a valve normally open condition. Alternatively the spring may be removed entirely and the valve can function as a double-acting valve controlled by air pressure ports in the actuator base extending to one recess and in the actuator cap extending to the other recess. A relatively large diameter valve seal extends from the bottom end of the stem and seals in a closed position on a large diameter valve seat at the bottom of a central valve cavity. Fluid inlet and outset passages with smooth transition sections allow for fluid passage through a relatively large flow orifice between the stem seal and valve seat adjacent to the inlet and outlet passages.

US Patent:

D3314499, Dec 1, 1992

Filed:

Jan 29, 1990

Appl. No.:

7/471808

Inventors:

David Adishian - Palos Verdes Estates CA
Ira J. Silverman - Northridge CA

Assignee:

Sequoia Controls Co., Ltd. - Carson CA

US Classification:

D23233