Fluid handling – Freeze condition responsive safety systems – Low temperature responsive drains
Patent
1996-12-03
1997-12-02
Walton, George L.
Fluid handling
Freeze condition responsive safety systems
Low temperature responsive drains
60531, 236 99R, 237 80, E03B 712
Patent
active
056925352
ABSTRACT:
Apparatus for automatically opening an orifice to allow flow when ambient temperature drops below a predetermined level, such as the freezing point of water. The apparatus is for connection to a liquid line that carries liquid at a selected pressure for producing a selected low flow rate of liquid from the liquid line when the ambient temperature drops below a selected temperature. The apparatus comprises an orifice in the end of the liquid line of selected small diameter, a closed chamber means having an expansible portion filled with a selected condensible gas, for which the vapor pressure varies with temperature in a known manner. The apparatus further comprises a valve assembly selectively positioned adjacent the orifice and at a specific distance from the expansible portion of the closed chamber. The closure means is selectively positioned by means of spacers positioned adjacent the valve assembly. A means connecting the expansible portion of the chamber to a closure means in the valve assembly is provided to shut off the flow of liquid by sealing an orifice when the temperature is above a selected value, and to open the orifice to allow a small trickle flow of liquid whenever the ambient temperature is less than a selected value, such as the freezing point of water.
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