Aligning and seal ring retracting apparatus for plug type valve

Details Aligning and seal ring retracting apparatus for plug type valve Aligning and seal ring retracting apparatus for plug type valve

1989-10-26

1990-12-18

Rosenthal, Arnold

Valves and valve actuation

Reciprocating valve

Piston

92259, 92247, 277144, 13762537, F16K 146

Patent

active

049781022

ABSTRACT:
A valve plug assembly for use in a steam throttle valve includes a valve body and a removable guide ring attached to one end of the valve body. An outer edge portion is removed from the guide ring at the interface with the valve body so that a circumferential groove is defined about the valve plug when the guide ring is assembled to the valve body. A slot is formed in one wall of the groove, preferably in the guide ring, and a wear ring inserted in the slot. The wear ring extends above the wall surface and terminates in an angled bearing surface. A pressure seal ring is formed with a mating bearing surface and is placed in the groove prior to assembly of the valve plug. The angular taper on the mating bearing surfaces causes some retraction of the pressure seal ring in response to sudden valve plug movement in the closed direction.

REFERENCES:
patent: 1419857 (1922-06-01), Johnston
patent: 1885290 (1932-11-01), Reiland et al.
patent: 2376147 (1945-05-01), Johnston
patent: 3605787 (1971-09-01), Krogfoss
patent: 4712769 (1987-12-01), Johnson

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