Gate valve structure

Details Gate valve structure Gate valve structure

1984-01-06

1984-12-04

Weakley, Harold W.

Valves and valve actuation

Reciprocating valve

Gate

251167, 251172, 251196, F16K 300

Patent

active

044860030

ABSTRACT:
An expanding gate valve with a valve seat structure which comprises a pair of "floating" seat rings (60) loosely received in annular seat pockets (52) surrounding the flow passage through the valve and each having an axial dimension which exceeds the depth of the seat pocket. The front face (61) of each seat ring is disposed adjacent the gate assembly (24, 26) and is provided with an annular groove (63) and an annular resilient sealing element (64) therein adapted to form a ring of sealing contact area about the flow passage (14) when the gate assembly is expanded thereagainst. The rear face (66) of the seat ring (60) is provided with an annular groove (63') and a second annular resilient sealing element (64'). The two annular sealing elements are coaxial and the inner diameter of the front sealing element (64) exceeds that of the rear sealing element (64') so that the front sealing element is a greater radial distance from the flow passage (14) than is the rear sealing element. When the gate assembly is expanded against the seat rings (60), the annular area of the front of the seat ring exposed to flowline pressure exceeds the annular area of the rear of the seat ring exposed to flowline pressure whereby the seat ring is pressure energized towards the bottom (54) of the seat pocket (52). The annular sealing elements (64, 64') and bottoms of the annular grooves (63, 63') are provided with cooperating frusto-conical wedging surfaces (80, 94 and 80', 94') which for the upstream seat ring wedge the front face sealing element (64) towards the gate assembly and the rear sealing element (67) towards the bottom (54) of the seat pocket when there is pressure in the flow passage. To provide for a pressure energized downstream seal in the event of an upstream leak, additional frusto-conical surfaces on the sealing elements are provided to cooperate with additional frusto-conical surfaces in the groove bottom whereby fluid pressure from the valve chamber energizes the sealing elements to provide a downstream seal. A groove in the rear face of each sealing element between its frusto-conical surfaces adds sealing capability.

REFERENCES:
patent: 3006601 (1961-10-01), Anderson
patent: 3929316 (1975-12-01), Guthrie
patent: 4236691 (1980-12-01), Wright
patent: 4320890 (1982-03-01), Meyer

Affiliated with

Also associated with

Rating

Gate valve structure does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Gate valve structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gate valve structure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1578925