Water cock with non-freezing valve Patent #: 4066090
ApplicationNo. 06/112485 filed on 01/16/1980
US Classes:137/62, Low temperature responsive drains137/317, Tapping a pipe, keg, or apertured tank under pressure137/79, Temperature138/34, Anti-freeze substance138/35, Portable thawing apparatus237/80ANTIFREEZING DEVICES
ExaminersPrimary: Rosenthal, Arnold
Assistant: Walton, G. L.
Attorney, Agent or Firm
International ClassesE03B 7/00 (20060101)
E03B 7/10 (20060101)
AbstractA gate valve, mounted in a drain pipe connected to a downstream exposed end of a part of a plumbing system subject to occasional freezing, is controlled to open and close by opposed pressures of a spring and a temperature controlled pressure of a refrigerant fluid in an expansible and contractable bellows, the respective pressures being equalized at 33 degrees F. with gate valve closed, the pressure differentials therebetween resulting from temperature changes progressively opening and closing valve at temperatures below 33 degrees F. and closing it and keeping it closed at 33 degrees F. and above, and thereby preventing the plumbing from freezing, by allowing water to flow therethrough at and below freezing.