Pull type relay valve with automatic lockout

Details Pull type relay valve with automatic lockout Pull type relay valve with automatic lockout

1979-07-16

1980-12-16

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 13042, F16K 3700

Patent

active

042390583

ABSTRACT:
A manually set relay valve for controlling fluid flow to and from a valve actuator. A slide valve (60) is manually pulled outwardly to the set or open position and held therein by pilot pressure applied to a piston chamber (46) through a passage (104) in the slide valve. When the slide valve is tripped to the closed position due to an interruption of pilot pressure, a cross port (106) of the fluid passage vents the piston chamber to maintain the relay closed until manually reset.

REFERENCES:
patent: 3877484 (1975-04-01), Theriot et al.
patent: 4121615 (1978-10-01), Bergeron

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