Motors: expansible chamber type – With correlated control of motive fluid and locking means – Working member position control of motive fluid and locking...
Patent
1982-12-28
1988-11-15
Hershkovitz, Abraham
Motors: expansible chamber type
With correlated control of motive fluid and locking means
Working member position control of motive fluid and locking...
91 44, 91410, 92 27, F15B 1526
Patent
active
047840374
ABSTRACT:
A locking apparatus for fluid operated valves having a piston connected to the valve actuator which moves in response to applied pressure within a cylinder housing having a cylinder head, a catch block is secured to the piston, and the cylinder head incorporates a catch pin. Pressure applied to the cylinder to open the valve moves the piston adjacent to the cylinder head where the catch pin automatically engages the catch block preventing futher movement of the piston or premature closure of the valve. Application of pressure to the cylinder to close the valve, retracts the catch pin, allowing the valve to close. Included are one or more selector valves, for selecting pressure application to other apparatus depending on the gate valve position, open or closed, protecting such apparatus from damage due to premature closing caused by pressure loss or operational error.
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Fabyan Joseph
Williams Carl W.
Carnahan L. E.
Gaither Roger S.
Hershkovitz Abraham
Hightower Judson R.
The United States of America as represented by the United States
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