Apparatus for individual isolation of hydraulically actuated val

Details Apparatus for individual isolation of hydraulically actuated val Apparatus for individual isolation of hydraulically actuated val

1980-06-26

1982-08-10

Nilson, Robert G.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

91450, 251 29, F15B 13043, F16K 31124

Patent

active

043434541

ABSTRACT:
Apparatus for individually isolating the hydraulic actuators of steam valves for a steam turbine while the turbine remains in operation and while all other steam valves associated with the turbine remain functional. Isolation is achieved by providing a manual isolation valve for blocking the flow of hydraulic fluid from a main supply; a flow restrictor to limit the inflow of hydraulic fluid; and a flow direction control means to limit hydraulic fluid to flow only from the actuator toward an emergency trip hydraulic fluid supply.

REFERENCES:
patent: 3182971 (1965-05-01), Wakeman
patent: 3495501 (1970-02-01), Kure-Jensen
patent: 3656708 (1972-04-01), Hobbs
patent: 3684236 (1972-08-01), Lewis
patent: 3948478 (1976-04-01), Vind
1977 Electric Utility Engineering Conference, vol. II, Mar. 1977.

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