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Class Information
Number: 137/464
Name: Fluid handling > Line condition change responsive valves > Safety cut-off requiring reset > Fluid counter-biased or unseated valve
Description: Apparatus in which the valve is urged or biased, as by gravity or a spring means, toward a closed or cut-off position and this bias is opposed by the fluid pressure within the apparatus, a lowering in the fluid pressure permitting the valve to seat or close, the arrangement being such that the valve does not return to open position on subsequent increase of fluid pressure.










Sub-classes under this class:

Class Number Class Name Patents
137/466 With fluid pressure seating of valve 13
137/465 With mechanical stop against reopening 7


Patents under this class:

Patent Number Title Of Patent Date Issued
8307847 Ejector valve with glands Nov. 13, 2012
7216668 Interruption valve with automatic reset May. 15, 2007
7090144 Water fountain attachment for a faucet Aug. 15, 2006
6789566 Safety contrivance for gas-using device Sep. 14, 2004
5860446 Method and apparatus for safely controlling fluid flow Jan. 19, 1999
5289843 Hydraulic safety valve Mar. 1, 1994
5238020 Hydraulic valve Aug. 24, 1993
4469124 Gas shut-off valve Sep. 4, 1984
4461315 Pressure protection system Jul. 24, 1984
4446890 Continuity actuated isolation valve assembly May. 8, 1984
4413643 Hose-break valve Nov. 8, 1983
4352366 Velocity operated standing valve Oct. 5, 1982
4343327 Pressure responsive, manually opening valve Aug. 10, 1982
4173233 Pilot valve Nov. 6, 1979
4151863 Deflation device May. 1, 1979
4085772 Valve assembly Apr. 25, 1978
4080987 Hydraulic safety valve Mar. 28, 1978
3971404 Hydraulic runaway control valve Jul. 27, 1976











 
 
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