Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1982-02-16
1984-05-15
Capossela, Ronald C.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
91515, 92 33, 92 76, 92146, 251144, 251326, F16K 31163
Patent
active
044483899
ABSTRACT:
The safety device includes a self-closing cylindrical gate which, in closed position, blocks the hydraulic conduit surrounding the hydraulic turbomachine; the gate is housed, in the open position, in a chamber including two components near the hydraulic conduit defining wth the gate two orifices situated upstream and downstream with respect to the gate; pressure on top of the gate takes an intermediate value between the upstream and downstream pressures, and is determined by the ratio of the product of the discharge coefficient with the passage cross-section upstream orifice over the product of the discharge coefficient with the passage cross-section downstream orifice, so that a pressure is exerted on the upper edge of the gate, resulting in a force which tends to move the gate to close the hydraulic conduit.
REFERENCES:
patent: 2494634 (1950-01-01), Schmidt
patent: 3226078 (1965-12-01), Anderson
patent: 3307574 (1967-03-01), Anderson
patent: 3463193 (1969-08-01), Yost
patent: 3515033 (1970-06-01), Geyer
patent: 3957245 (1976-05-01), Daghe
patent: 4201365 (1980-05-01), Paptzun et al.
patent: 4288059 (1981-09-01), Gurbin
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