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Class Information
Number: 137/46
Name: Fluid handling > Control by change of position or inertia of system > By pendulum or swinging member > With servo connection to valve
Description: Apparatus in which the pendulum or pivoted member controls the application of another source of power for operating the control instead of by acting directly through a mechanical connection.

Patents under this class:

Patent Number Title Of Patent Date Issued
8500999 System for water treatment regeneration stage Aug. 6, 2013
7152615 Earthquake actuated horizontal valve with micro switch Dec. 26, 2006
5271425 Valve closing apparatus responsive to movement Dec. 21, 1993
4979528 Gas actuated valve system Dec. 25, 1990
4920999 Air actuated valve system with seismic controller May. 1, 1990
4852600 Air actuated valve system with seismic controller Aug. 1, 1989
4587859 Seismic trigger May. 13, 1986
4545203 Hydrostatic drive units Oct. 8, 1985
4531533 Seismic trigger Jul. 30, 1985
4201536 Vibration responsive mechanism May. 6, 1980
4094332 Earthquake-responsive fuel shut-off device Jun. 13, 1978
3938538 Control valve apparatus Feb. 17, 1976

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