Motors: expansible chamber type – With correlated control of motive fluid and locking means – By electrical control means
Patent
1976-03-08
1978-07-25
Schwadron, Martin P.
Motors: expansible chamber type
With correlated control of motive fluid and locking means
By electrical control means
91 43, 91 44, 91361, F15B 1526
Patent
active
041022483
ABSTRACT:
This disclosure relates to a system for protecting pneumatic cylinders and diaphragm valves against failure of both electrical and pneumatic supplies. In the event of a failure of the air supply, the loss of air pressure is detected and all drives are locked in position. The position pneumatic feedback signal from the pneumatic cylinder diaphragm valve is then connected directly to a pneumatic memory. Thus when the air supply recovers, the pneumatic memory will be equal to the instantaneous position of the pneumatic cylinder or diaphragm valve.
In the event of an electrical failure, a solenoid valve interrupts the flow of the pneumatic signal from an electropneumatic transducer to the pneumatic memory, so that the air cylinder or valve is directly connected to the pneumatic memory. By selectively energizing a pair of solenoid valves connected to the memory, the operator using an emergency d.c. source can then slue the memory up or down as required for control purposes until the restoration of the electrical supply.
REFERENCES:
patent: 2331108 (1943-10-01), De Ganahl
patent: 2984984 (1961-05-01), Dickey
patent: 3028844 (1962-04-01), Durham
patent: 3361034 (1968-01-01), Rothrock
patent: 3633603 (1972-01-01), Furlong
patent: 3641877 (1972-02-01), Hebert
patent: 3654833 (1972-04-01), Griffiths
patent: 3779135 (1973-12-01), Sugimura
patent: 3895779 (1975-07-01), Cassez
Hershkovitz Abraham
Schwadron Martin P.
Westinghouse Electric Corp.
Wood J. J.
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