Bellows valve

Valves and valve actuation – Hermetic flexible wall seal for actuator – Bellows

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Details

251 635, F16K 3100

Patent

active

049955896

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.

REFERENCES:
patent: 4526341 (1985-07-01), Thomas
patent: 4687017 (1987-08-01), Danko et al.
patent: 4804164 (1989-02-01), Nakazawa et al.

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