Directional control valve having an optical position indicator

Details Directional control valve having an optical position indicator Directional control valve having an optical position indicator

1987-12-10

1989-01-03

Rivell, John

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

25112915, 361 58, 361 91, 361106, 361165, 363126, 363142, 340662, F16K 3700

Patent

active

047949481

ABSTRACT:
A solenoid operated directional control valve includes a visual position indicator assembled of rectifying bridge circuit whose DC output terminals are bridged by a series connection of a light emitting diode with a PTC resistor. In this manner, the indicator is universally applicable both for DC and AC power sources and for a wide range of supply voltages.

REFERENCES:
patent: 3548290 (1970-12-01), Swinehart
patent: 3603843 (1971-09-01), Clements
patent: 4679766 (1987-07-01), Cuming

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