Pilot control relay valve apparatus

Details Pilot control relay valve apparatus Pilot control relay valve apparatus

1983-11-16

1985-12-24

Chambers, A. Michael

Fluid handling

With indicator, register, recorder, alarm or inspection means

Fluid pressure responsive indicator, recorder or alarm

137556, 137458, 13762566, F16K 1700

Patent

active

045599700

ABSTRACT:
An improved pilot control relay valve is disclosed to monitor pressure conditions in a pressurized system and to cause the system to shut down in response to detection of operating pressures excessive of an acceptable pressure range. Accurate monitoring is provided for by dual-piston action, with one of the pistons actuating a visual indicator mounted on the slide valve of the control relay valve, and with the second piston coaxially mounted within the first piston.

REFERENCES:
patent: 3877484 (1975-04-01), Theriot et al.
patent: 4256141 (1981-03-01), Peters
patent: 4442860 (1984-04-01), Taylor

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