Gate valve

Details Gate valve Gate valve

1983-03-18

1984-10-16

O'Connor, Daniel J.

Valves and valve actuation

Fluid actuated or retarded

Fluid link or column actuator

92 90, F16K 3112

Patent

active

044770529

ABSTRACT:
A gate valve for selectively blocking and unblocking a flow path has a valve body filled with hydraulic liquid and provided with a pair of shutters displaceable by fluid pressure against respective seating surfaces of a valve housing. The valve body is shiftable between a blocking position, in which the shutters are aligned with their seating surfaces, and an unblocking position by means of a plunger projecting into the hollow body in a fluidtight manner but with freedom of relative displacement in the shifting direction. In a valve-closing stroke, the plunger pushes that body into its blocking position solely via the confined liquid; when the body is arrested in that position by a stop, the continuing plunger stroke displaces the liquid to press the shutters onto their seats against a biasing force such as that of elastic membranes holding them onto the body. In a valve-opening stroke, the receding plunger hydraulically withdraws the shutters from their seats and then retracts the valve body into its unblocking position.

REFERENCES:
patent: 2406899 (1946-09-01), Pugh et al.
patent: 2426212 (1947-08-01), Hedene
patent: 2825528 (1958-03-01), Truitt
patent: 3301522 (1967-01-01), Ashbrook
patent: 3380470 (1968-04-01), Culpepper
patent: 4043533 (1977-08-01), Cowley
patent: 4320778 (1982-03-01), Baumann
patent: 4322055 (1982-03-01), Baumann

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