Raised hardface overlay valve seat

Details Raised hardface overlay valve seat Raised hardface overlay valve seat

1987-07-10

1988-10-11

Chambers, A. Michael

Valves and valve actuation

Valve

Materials

251328, 251359, 137 15, 291571R, F16K 300

Patent

active

047765666

ABSTRACT:
A raised hardface overlay valve seat, fused around the periphery of the port of a valve, having an inverted frustoconical body cavity and an inverted frustoconical plug inserted into said cavity in sealing engagement therewith. A major advantage of the raised hardface overlay seat is that it has a taper conforming to the taper of the plug and as a consequence, reduces the area in contact with the plug and effectively intensifies the sealing stress that can be generated between the plug and the seats by a downward force. The plug may be used with lapping compound to lap the seats, both prior to service and in the field. Sufficient space is allowed in the cavity for a substantial relap life.

REFERENCES:
patent: 2448483 (1948-08-01), Bassett
patent: 3982864 (1976-09-01), Cain
patent: 4377892 (1983-03-01), Gonzalez
patent: 4467510 (1984-08-01), Kinoshita et al.

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