Shut-off valve

Details Shut-off valve Shut-off valve

1990-07-06

1992-09-22

Fox, John C.

Valves and valve actuation

Reciprocating valve

Piston

251359, 277DIG6, F16K 324

Patent

active

051490552

ABSTRACT:
A piston type of shut-off valve with a sealing ring made of expanded graphite. A plurality of ring-shaped lamellae are each stamped from a foil of expanded graphite and then joined to form a sealing ring. A peripheral edge surface of the sealing ring, rather than its planar facing surface, comes into sealing contact with the piston thereby improving its service life. Service life of the sealing ring can be further improved by using a guard ring on a facing surface of the sealing ring as well as by using an installed density for the sealing ring of 1.5 to 2.2 g/cm.sup.3.

REFERENCES:
patent: 2097943 (1937-11-01), Zagorski
patent: 3425663 (1969-02-01), Priese
patent: 4269391 (1981-05-01), Saito et al.
patent: 4328974 (1982-05-01), White et al.
patent: 4394023 (1983-07-01), Hinojosa
patent: 4500092 (1985-02-01), Uomala et al.
patent: 4601475 (1986-07-01), Nicholson

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