Plug valve with hydraulically actuated seals

Details Plug valve with hydraulically actuated seals Plug valve with hydraulically actuated seals

1982-09-15

1985-02-05

Weakley, Harold W.

Valves and valve actuation

Lost motion between actuator and valve

Lever

251159, 251161, 251170, 251175, 251188, 137556, 137568, F16K 3144

Patent

active

044974671

ABSTRACT:
A rotary plug valve has hydraulically actuated seals for sealing between a valve body and a rotatable valve plug. The valve plug is rotated to open or close the valve. A valve handle for turning the plug can be rotatably uncoupled from the valve plug when the valve is closed and turned relative to the plug toward an overtravel position to actuate a hydraulic piston to pressurize the seals. A second piston regulates pressure to the seals and prevents overpressurization.

REFERENCES:
patent: 2299341 (1942-10-01), Ohls
patent: 2600898 (1952-06-01), Maxwell
patent: 2611393 (1952-09-01), Gravenhorst
patent: 2746712 (1956-05-01), Wickwau
patent: 3037524 (1962-06-01), Rast
patent: 3213615 (1965-10-01), Bjornberg
patent: 3464669 (1969-09-01), Henrion
patent: 3475004 (1969-10-01), Jennings
patent: 3711062 (1973-01-01), Kirkwood
patent: 3901474 (1975-08-01), Kubota
patent: 4130129 (1978-12-01), Pollock
patent: 4136710 (1979-01-01), Bond
patent: 4141536 (1979-02-01), Graham
patent: 4215722 (1980-08-01), Sigmon

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