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Class Information
Number: 137/455
Name: Fluid handling > Line condition change responsive valves
Description: Apparatus in which a valve is controlled in response to a change in the fluid condition, occurring within the system or line including the valve, which change has not been effected by external means for the express purpose of controlling the operation of the valve.

Sub-classes under this class:

Class Number Class Name Patents
137/493 Bi-directional flow valves 188
137/479 Combustion engine induction type 4
137/467.5 Consistency responsive 19
137/511 Direct response valves (i.e., check valve type) 51
137/467 Fluid opened valve requiring reset 89
137/484.2 Line flow effect assisted 34
137/485 Pilot or servo controlled 25
137/469 Pop valves 114
137/456 Safety cut-off requiring reset 53
137/468 Thermal responsive 190
137/494 With separate connected fluid reactor surface 263

Patents under this class:

Patent Number Title Of Patent Date Issued
8642225 High-pressure fluid supply apparatus Feb. 4, 2014
8607746 Cooling system expansion tank Dec. 17, 2013
8596294 Hydraulic control system with passive charging of an accumulator Dec. 3, 2013
8550179 Proportional pilot-controlled pneumatic control system for pneumatically powered hand-held tools Oct. 8, 2013
8470136 Parts washer with recycler assembly Jun. 25, 2013
8470137 Recycler assembly Jun. 25, 2013
8308936 Heat pump-type hot-water supply device Nov. 13, 2012
8230829 Control arrangement for a gas exchange valve in a piston engine and method of controlling a gas exchange valve in a piston engine Jul. 31, 2012
8176996 Proportional pilot-controlled pneumatic control system for pneumatically powered hand-held tools May. 15, 2012
8043556 Ablutionary installations Oct. 25, 2011
8001989 Liquid flow control device Aug. 23, 2011
7980265 Valve responsive to fluid properties Jul. 19, 2011
7775295 Proportional pilot-controlled pneumatic control system for pneumatically powered hand-held tools Aug. 17, 2010
7775394 Opening-force-maximizing device of an underpressure-activated valve for a drinking container Aug. 17, 2010
7690391 Liquid flow control devices Apr. 6, 2010
7530469 Valve device having two membranes for a drinking container May. 12, 2009
7513269 Hydraulic control system for automatic transmission Apr. 7, 2009
7419069 Valve for a drinking receptacle Sep. 2, 2008
7317402 Alarm in a device for dispensing volatile anesthetics Jan. 8, 2008
7150825 Sealing apparatus of fuel filter Dec. 19, 2006
7114404 System and method for detecting flow in a mass flow controller Oct. 3, 2006
6729145 Process plant May. 4, 2004
6681762 Method and an apparatus for providing a constant medicine dose for an inhalic application at low inhalic flow Jan. 27, 2004
6446456 Heat pump and method for controlling operation thereof Sep. 10, 2002
H2027 Flexible slit valve Jun. 4, 2002
6280159 Valve arrangement and pump for a gear system Aug. 28, 2001
6110325 Apparatus and method for processing a feed Aug. 29, 2000
6103079 Anti-leakage apparatus Aug. 15, 2000
5699664 Shut-off valve unit for a circuit for injecting air in the exhaust system of an internal combustion engine Dec. 23, 1997
5630935 Pressure relief valve with sample removal port May. 20, 1997
5178324 Method of regulating a central or district heating plant by means of a differential pressure valve, and unit for working method Jan. 12, 1993
5070899 Check valve Dec. 10, 1991
4609003 Method and apparatus for generation of a pneumatic feedback trigger signal Sep. 2, 1986
4408943 Ship-to-ship fluid transfer system Oct. 11, 1983
4406938 Discharge machining apparatus Sep. 27, 1983
3982559 High temperature fluid pressure control valve Sep. 28, 1976
3982558 Fluid pressure control valve Sep. 28, 1976
3958724 Pressure regulator for spray systems May. 25, 1976

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