Thermostatic self-powered drain valve

Details Thermostatic self-powered drain valve Thermostatic self-powered drain valve

1978-07-14

1981-01-06

Schwadron, Martin P.

Fluid handling

Freeze condition responsive safety systems

Low temperature responsive drains

137491, 1376256, 13762568, 237 80, E03B 710, F16K 3138

Patent

active

042430623

ABSTRACT:
A water or other fluid containing system is protected by a thermostatically controlled drain valve having input, output, drain and control ports. A slideable barrier within the valve selectively directs the flow within the valve between the ports. A small coupling orifice through the barrier allows equal static pressures to develop on opposite sides of the barrier, and a thermosensitive relief mechanism at the control port relieves the pressure on one side of the barrier when ambient temperature drops below a predetermined level. Unequal pressures upon the barrier shift the barrier, redirecting the flow within the valve.

REFERENCES:
patent: 629794 (1899-08-01), Lindsay
patent: 954532 (1910-04-01), Mallory
patent: 2301318 (1942-11-01), Peo
patent: 3227179 (1966-01-01), Rosaen
patent: 3610284 (1971-10-01), Spencer

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