Limited float seat construction for expanding gate valve

Details Limited float seat construction for expanding gate valve Limited float seat construction for expanding gate valve

1977-10-21

1978-09-26

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

Gate valve

251328, 251361, 251363, F16K 300

Patent

active

041164199

ABSTRACT:
A limited float or controlled float seat assembly for a gate valve with a transversely expandable gate assembly has generally L-shaped annular seat retainers fixed in recesses around the valve inlet and outlet flow passageways and generally L-shaped annular seat members mounted in a complementary relation within each of the seat retainers. The seat retainers each have an inturned lip opposite to and spaced from the end of the recess. The inturned lips form limit stops for the seat members. The seat members have an outturned lip which contacts the inturned lip of the seat retainer thereby limiting movement of the seat member when the seat member moves to an extended position. The combined amount of float for both seat members is less than the total expansion of the gate assembly from a collapsed position to an expanded position where it seals with the seat members so that drag of the seat members on the gate assembly is minimized.

REFERENCES:
patent: 3006601 (1961-10-01), Anderson
patent: 3301523 (1967-01-01), Lowrey
patent: 3743244 (1973-07-01), Dickenson

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