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Class Information
Number: 137/517
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Biased open
Description: Valves in which a bias means is provided to maintain the valve normally open against fluid pressure on the valve itself tending to close or partly close the valve. The bias means may be the weight of the valve body itself.










Sub-classes under this class:

Class Number Class Name Patents
137/518 Oppositely swinging vanes 9
137/521 Pivoted valves 70
137/519 Weight biased 44


Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8701693 Nozzle check valve Apr. 22, 2014
8646485 Flow restrictor and method for reducing resistance of a flow Feb. 11, 2014
8640733 Excess flow cartridge Feb. 4, 2014
8627847 Backflow preventer valve Jan. 14, 2014
8607746 Cooling system expansion tank Dec. 17, 2013
8517051 Automatic flow control regulator valve Aug. 27, 2013
8485220 Automatic flow regulator valve Jul. 16, 2013
8430121 Gas flow monitor Apr. 30, 2013
8418712 Air discharge implement for a portable pressurized sprayer Apr. 16, 2013
8409443 Vessel, dispensing devices, kits and methods for containing fluids Apr. 2, 2013
8353311 Anti-flooding device Jan. 15, 2013
8333073 Internal combustion engine with two-stage turbo charging system Dec. 18, 2012
8302594 Air control regulator for combustion chamber Nov. 6, 2012
8276618 Flow restrictor and method for reducing resistance of a flow Oct. 2, 2012
8256465 Microfluidic valve structure Sep. 4, 2012
8240329 Fluid control valve Aug. 14, 2012
8235066 Automatically tripped compact safety device for controlling the flow of a fluid Aug. 7, 2012
8186377 Fluid on-off valve device May. 29, 2012
8167002 Flow restrictor May. 1, 2012
8079358 Air control regulator for combustion chamber Dec. 20, 2011
8020582 Excess flow valve Sep. 20, 2011
7955301 Injection shut off valve with pressure actuator for delivery of compositions Jun. 7, 2011
7849875 Check valve Dec. 14, 2010
7766027 Vented steamer port cap assembly Aug. 3, 2010
7766262 Irrigation systems including flush valves, and methods for flushing debris from irrigation systems Aug. 3, 2010
7757673 Three position fuel line check valve for relief of diurnal pressure Jul. 20, 2010
7753070 Insertable component which can be inserted into a gas or liquid line Jul. 13, 2010
7743786 Irrigation system and shut-off control device therefor Jun. 29, 2010
7677262 Safety valve of a high pressure storage, in particular a hydrogen storage tank Mar. 16, 2010
7639151 Liquid blocking apparatus and system equipped with an alarm or wireless calling device and a storing bag Dec. 29, 2009
7562668 Excess flow valves Jul. 21, 2009
7533689 Excess flow control valve May. 19, 2009
7455071 Hydraulic control valve for drip hoses Nov. 25, 2008
7444995 Fuel line check valve system for relief of diurnal pressure Nov. 4, 2008
7431050 Liquid delivery device Oct. 7, 2008
7398795 Excess flow valve Jul. 15, 2008
7377286 Drain valve May. 27, 2008
7318556 Water line safety valve Jan. 15, 2008
7296594 Combination check valve and neutral valve assembly for use in a hydraulic component Nov. 20, 2007
7246635 Automatic flow rate control valve Jul. 24, 2007
7246607 Three position fuel line check valve for relief of diurnal pressure Jul. 24, 2007
7225829 Flow-control valve assembly Jun. 5, 2007
7219688 Fluid control valve May. 22, 2007
7219690 Flow control valve May. 22, 2007
7207349 Hydraulic flow pressure switch Apr. 24, 2007
7178544 Combination shut-off and resetable excess flow valve Feb. 20, 2007
7140386 Surge suppression and safety cut-off valve Nov. 28, 2006
7032620 Valves and methods for manufacturing the valves Apr. 25, 2006
7033133 Air turbine starter having a low differential check valve Apr. 25, 2006
7004193 Valve arrangement and traffic calming device incorporating such an arrangement Feb. 28, 2006

1 2 3 4 5 6










 
 
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