Relay valve for fluid actuators

Details Relay valve for fluid actuators Relay valve for fluid actuators

1982-12-13

1985-03-12

Michalsky, Gerald A.

Fluid handling

With indicator, register, recorder, alarm or inspection means

Fluid pressure responsive indicator, recorder or alarm

137458, 13762566, 251 63, F15B 1301, F15B 2000

Patent

active

RE0318450

ABSTRACT:
A relay valve for controlling fluid flow to and from a valve actuator included in a safety system for a flowline such as a production line of an oil or gas well. The relay includes a slide valve (60) which is manually pushed inwardly to the open or set position and held therein by pilot fluid which is also applied to the valve actuator. A visual indicator mounted on a knob (102) of the slide valve is operated by fluid applied to a passage (96) formed in the slide valve. A vent port (82) prevents pilot pressure from moving the slide valve from the closed position to the open position. A modified relay valve (150) has separate inlet ports (198 and 200) for receiving pilot fluid and actuator fluid and a vent port (206) which is in direct fluid communication with the pilot port in the closed position of the slide valve.

REFERENCES:
patent: 3042061 (1962-07-01), Dobrikin
patent: 3877484 (1975-04-01), Theriot et al.
patent: 4004610 (1977-01-01), Theriot
patent: 4094340 (1978-06-01), Bergeron
patent: 4121615 (1978-10-01), Bergeron
patent: 4137942 (1979-02-01), Hargraves et al.
patent: 4145025 (1979-03-01), Bergeron

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