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Class Information
Number: 137/269.5
Name: Fluid handling > Convertible > Reversible check
Description: Devices comprising check valves mounted in alternately positionable carriers whereby a carried valve may check fluid flow in either of two directions by repositioning the carrier.

Patents under this class:

Patent Number Title Of Patent Date Issued
8584705 Bidirectional sleeved/plug ball check valve Nov. 19, 2013
8267162 Bi-directional pressure relief valve for a plate fin heat exchanger Sep. 18, 2012
7757704 Coupling assembly with a core unit therein Jul. 20, 2010
7640945 Oneway valve for automatically inflatable air cushion Jan. 5, 2010
7028709 One-way valve with poppet member Apr. 18, 2006
6789567 Bi-directional constant flow device Sep. 14, 2004
6668858 Check valve Dec. 30, 2003
6341618 Plumbing stop valve and method of use Jan. 29, 2002
6247489 Check valve Jun. 19, 2001
6227231 Pressure/flow rate control valve May. 8, 2001
5921271 Safety shut-off valve for high pressure bottles Jul. 13, 1999
5918623 Starting valve Jul. 6, 1999
5671769 Swing check valve and method for repairing same Sep. 30, 1997
5507630 Quick release interchangeable valve arrangement for slurry pump systems Apr. 16, 1996
5004005 Combination valve Apr. 2, 1991
4989631 Valve device with control sleeve and check valve Feb. 5, 1991
4969484 Reversible flow check valve Nov. 13, 1990
4928725 Combination plug and two-way check valve May. 29, 1990
4846218 Check valve for liquid chromatography pumps Jul. 11, 1989
4770413 Breathing exercise device Sep. 13, 1988
4759198 Ventilator for refrigerator Jul. 26, 1988
4708084 System for distributing water flow between a reservoir and a water source Nov. 24, 1987
4601467 Valve module and apparatus therefor Jul. 22, 1986
4589441 System for controlling liquid flow May. 20, 1986
4537213 Double flapper check valve Aug. 27, 1985
4535876 Shock absorber construction Aug. 20, 1985
4417861 Cell culture pumping system Nov. 29, 1983
4296772 Non-return valve Oct. 27, 1981
4257443 Check valve Mar. 24, 1981
4183373 Fluid pressure-operated systems Jan. 15, 1980
4169578 Rotary valve with spring biased valve member Oct. 2, 1979
4082108 Valve block Apr. 4, 1978
4072291 Rotary valve with spring biased valve member Feb. 7, 1978
4062378 Easily disassembled, one-way check valve Dec. 13, 1977

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