Valves and valve actuation – Lost motion between actuator and valve – Lever
Patent
1984-08-31
1986-07-08
Weakley, Harold W.
Valves and valve actuation
Lost motion between actuator and valve
Lever
251159, 251172, 60592, 138 31, F16K 3144
Patent
active
045988951
ABSTRACT:
A valve having a body with an inlet duct, an outlet duct and a plug rotatably disposed in the body. The plug has a port to provide for fluid communication between the inlet and outlet ducts and is movable between an open position wherein the port at least partially registers with both the inlet and outlet ducts to pass fluid through the valve to a closed position wherein no part of the port registers with the ducts, thereby preventing fluid from passing through the valve. The valve has a pressurizable seal between the body and plug, when the plug is at both the open and closed positions. To actuate the seal, a closed hydraulic system is provided. A regulator piston is urged against the pressure of the hydraulic system with a preselected force to regulate the hydraulic pressure. The valve also includes a mechanism to compensate for hydraulic fluid thermal expansion.
REFERENCES:
patent: 1056529 (1913-03-01), Fox
patent: 2611393 (1952-09-01), Gravenhorst
patent: 3037524 (1962-06-01), Rast
patent: 3077898 (1963-02-01), Raymond
patent: 3096786 (1963-07-01), Rost
patent: 3182458 (1965-05-01), Smith
patent: 3213615 (1965-10-01), Bjornberg
patent: 3464669 (1969-09-01), Henrion
patent: 3901474 (1975-08-01), Kubota
patent: 4130129 (1978-12-01), Pollock
patent: 4141536 (1979-02-01), Graham
patent: 4497467 (1985-02-01), DeWald
DeWald Carl O.
Pollock Jack H.
Precision Technologies
Weakley Harold W.
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