Control valve

Details Control valve Control valve

1977-11-03

1979-10-16

Wayner, William E.

Automatic temperature and humidity regulation

Motors

Relay

251 11, 236 92B, F16K 3118

Patent

active

041710878

ABSTRACT:
An expansion valve for a refrigeration system, and in particular, for a reversible flow or heat pump application is provided in which the valve is electrically operated by a heat motor mounted to a valve body. The valve includes a valve stem operatively connected to the heat motor. The valve stem position, and consequently, valve operation, is controlled by heat motor operation. Because of the reverse flow nature of the fluid flow in the system described, means for protecting the heat motor from fluid leakage is necessary, if the valve is to function properly. The valve of this invention includes bleed or drain means positioned to drain fluid from the heat motor, and seal means on the valve stem of the valve to reduce flow leakage along the stem.

REFERENCES:
patent: 2049204 (1936-07-01), Jacobsen
patent: 3405535 (1968-10-01), Matthies
patent: 3967781 (1976-07-01), Kunz
patent: 4010769 (1977-03-01), DeLorenzo et al.
patent: 4043532 (1977-08-01), Draxler

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