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Class Information
Number: 137/531
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Reciprocating valves > Varying effective lever arm
Description: Valves in which the bias is applied through a lever the effective length of which varies as the valve opens or closes.

Patents under this class:

Patent Number Title Of Patent Date Issued
8479764 Safety valve Jul. 9, 2013
6391019 Valve apparatus and valve system using thereof May. 21, 2002
6227239 Spring-loaded safety valve May. 8, 2001
5205311 Compound lever controlled spill valve Apr. 27, 1993
5046525 Differential loading fluid check valve Sep. 10, 1991
4687022 Pressure relief valve and regulator Aug. 18, 1987
4384576 Ventilator apparatus May. 24, 1983
4201242 Pressure relief valve May. 6, 1980

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