Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1986-07-23
1988-05-31
Rosenthal, Arnold
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251193, 251 65, F16K 316
Patent
active
047475773
ABSTRACT:
A gate valve, for use with evacuable equipment, includes a housing having a pair of aligned ports in opposed walls. A valve seat surrounds one of the ports. A gate member is reciprocally translatable by means of a linear actuator in a direction generally normal to the central axis of the valve seat. Magnetic structures are operably associated with the gate and valve seat for pulling the gate and seat into sealing engagement for closure of the gate valve by exerting a closure force generally parallel to the axis of the valve seat. The linear actuator includes a hollow cylinder having a piston movable therein and axially thereof which is magnetically coupled through the walls of the cylinder to an actuator member mechanically coupled to the gate for effecting reciprocal motion thereof.
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patent: 4534539 (1985-08-01), Dettmann
patent: 4534714 (1985-08-01), Smith
Cassett Larry R.
Draegert David A.
Rosenthal Arnold
The BOC Group Inc.
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