Fluid handling – Systems – Sequentially progressive opening or closing of plural valves
Patent
1976-08-16
1978-04-04
Schwadron, Martin P.
Fluid handling
Systems
Sequentially progressive opening or closing of plural valves
60403, 91368, 91391R, 251 14, 251 58, 251263, F15B 1310, F16K 1114, F16K 31163
Patent
active
040821153
ABSTRACT:
A valve operator for steam turbine inlet control valves, each of the control valves being set by a corresponding valve cam. The operator comprises pilot operated hydraulic means for positioning the valve cams in a normal or power mode of operation, mechanical means for positioning the valve cams in a back-up or manual mode of operation and manual actuation means for actuating the hydraulic means in a normal mode of operation and, in the event of failure of the hydraulic means, for automatically actuating the mechanical means in a back-up mode of operation. The hydraulic actuator positions the valve cams through a rack and pinion assembly. Both the hydraulic means and the mechanical means are actuated from an input shaft driving a reduction gear box. The mechanical means comprises a dog connected to the output of the gear box and a pin on the cam shaft driven by the dog in the manual mode of operation. In the hydraulic mode of operation a feedback cam and the pin are rotated faster than the dog, thereby precluding the engagement of the pin by the dog, so that the opening force is provided solely by the hydraulic means. In the event of failure of the hydraulic means, rotation of the feedback cam and the pin by the hydraulic means terminates and the dog rotates into engagement with the pin. Thereafter, rotation of the valve cams is effected by means of the manual input to the input shaft.
REFERENCES:
patent: 2613542 (1952-10-01), Van Nest et al.
patent: 2622617 (1952-12-01), Sederquist
patent: 2713351 (1955-07-01), Van Nest et al.
patent: 3403891 (1968-10-01), Johnson et al.
patent: 3422831 (1969-01-01), Straney et al.
patent: 3441040 (1969-04-01), Gray
patent: 3551066 (1970-12-01), Sakamoto et al.
patent: 3901274 (1975-08-01), Taber et al.
Gibb George H.
Rabeau Henry A.
Ahern John F.
General Electric Company
Gerard Richard
Messenger Herbert E.
Mitchell James W.
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