Valve seat structure

Details Valve seat structure Valve seat structure

1981-02-20

1982-03-23

Weakley, Harold W.

Valves and valve actuation

Reciprocating valve

Gate

251167, 251196, F16K 300

Patent

active

043208908

ABSTRACT:
A valve seat structure for an expanding type gate valve (20). A valve seat (64) is received in each annular seat recess (62) formed around the upstream and downstream flow passages (24, 26) and opening to the valve chamber (22) wherein a gate assembly (32) is movable between open and closed positions. An annular face seal (82) is mounted within an annular groove (70) in the front seat face (66) of each valve seat (64). A substantial portion of the bottom (76) of the annular groove (70) comprises a frusto-conical bottom portion (80) which forms a wedging surface with a cone angle in the range of approximately 30.degree. to 60.degree. and disposed substantially coaxial with the groove sides and the flow passages. The rear seal face (86) of the face seal (82) has a frusto-conical rear portion (94) that conforms to the frusto-conical bottom portion (80). The annular groove (70) is wider than the thickness of the face seal (82 ) so that the face seal loosely fits within the annular groove. The front seal face (84) extends beyond the front seat face (66) a distance in the range between approximately 0.0051 cm and 0.0381 cm when loosely seated in the annular groove. When the gate assembly (32) is expanded to the open or closed positions, the front seal face (84) engages the gate assembly (32) and the annular face seal (82) is axially compressed to effect a seal.
In the closed position, fluid pressure in the upstream flow passage (24) causes the annular seal (82) to wedge against the frusto-conical bottom portion (80) towards the gate assembly.

REFERENCES:
patent: 2869819 (1959-01-01), Rucker
patent: 3067978 (1962-12-01), Natho
patent: 3809360 (1974-05-01), Radzhabov
patent: 4124194 (1978-11-01), Alvarez
patent: 4236692 (1980-12-01), Williamson
patent: 4246928 (1981-01-01), Burns

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