Power driven valve actuator

Details Power driven valve actuator Power driven valve actuator

1986-11-26

1988-04-26

Wayner, William E.

Automatic temperature and humidity regulation

Motors

Relay

236DIG16, G05D 1500

Patent

active

047399252

ABSTRACT:
A power driven valve actuator includes a thermostatic device which is movably supported in a housing to accommodate overtravel of a thrust member against the stem of the valve resulting from excess expansion of a thermostatic element enclosed in the thermostatic device and heated by a heating device. Movement of the thermostatic device trips a dust-tight switch to interrupt power to the heating device, and a spring engaging the thermostatic device returns the thermostatic device to a starting position, so that whenever heat is called for by the thermostat, the thermostatic device cycles in a reciprocating motion within the housing after the valve has been fully opened. The heating device comprises an electric resistance heating element placed in contact with a thermal enclosure of the thermostatic element and covered by an insulating material.

REFERENCES:
patent: 1643523 (1927-09-01), Sauvage
patent: 1742091 (1929-12-01), Otto
patent: 2572386 (1951-10-01), Ray
patent: 3019986 (1962-02-01), Schoerner
patent: 3164365 (1965-01-01), White et al.
patent: 3326510 (1967-06-01), Kolze
patent: 3400906 (1968-09-01), Stocklin
patent: 3540479 (1970-11-01), Thompson
patent: 3709431 (1973-01-01), Channell et al.

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