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Class Information
Number: 137/532
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Reciprocating valves > Weight biased
Description: Valves in which the force of gravity is utilized to bias the valve.

Sub-classes under this class:

Class Number Class Name Patents
137/533 Valve body is the weight 42
137/534 Weight coaxial with valve 23

Patents under this class:

Patent Number Title Of Patent Date Issued
8636027 Vent with improved seal Jan. 28, 2014
8534310 Hot water circulation system Sep. 17, 2013
8424562 Check valve Apr. 23, 2013
6764059 Valve isolation system Jul. 20, 2004
6668862 Fluid bearing mechanism Dec. 30, 2003
6390121 Check valve controlled by differential pressure May. 21, 2002
4460013 Pressure-vacuum vent Jul. 17, 1984
4414997 Siphon Nov. 15, 1983
4370999 Pressure limiting device with two pressure levels for a pressure cooker Feb. 1, 1983
4064891 Plural fluid proportioning apparatus Dec. 27, 1977
3995657 Valve Dec. 7, 1976
3949781 Exhaust valve Apr. 13, 1976

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