Valve operator circuit with provision for presetting

Electricity: motive power systems – Motor-reversing – Armature or primary circuit control

Patent

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Details

318286, 318289, 318601, H02P 140

Patent

active

039978265

ABSTRACT:
A valve operator circuit normally operates to compare the pulse rates of two trains of pulses and to step an associated valve open or closed depending on which of the two pulse rates is the higher. The circuit includes a manually-operated presetting arrangement which, when operated, causes the normal pulses to be inhibited from moving the valve, and causes the valve to move to a desired position.

REFERENCES:
patent: 3286148 (1966-11-01), Henderson
patent: 3302085 (1967-01-01), Hulls et al.
patent: 3593080 (1971-07-01), Reynolds et al.

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