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Class Information
Number: 137/515
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > In couplings for coaxial conduits, e.g., drill pipe check valves
Description: Valves in which the valve is associated with or mounted in a housing provided with means for joining it with pipe at both ends, the three elements being longitudinally aligned when connected.










Sub-classes under this class:

Class Number Class Name Patents
137/515.7 Valve seat clamped between coupling elements 86
137/515.5 Valve seat formed on or carried by a coupling element 90
137/515.3 Valve seat threaded into a coupling element 7


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8672042 Continuous fluid circulation valve for well drilling Mar. 18, 2014
8403001 Connector for fuel tank and check valve Mar. 26, 2013
8342202 Pipe coupling member for high-pressure fluid Jan. 1, 2013
7726418 Method and apparatus for adding a tubular to drill string with diverter Jun. 1, 2010
7581559 Check valve for a fluid administration system Sep. 1, 2009
7419012 Wellbore top drive systems Sep. 2, 2008
7392828 Insertion part for inserting into a gas or liquid line Jul. 1, 2008
7302971 Umbrella valve and assembly Dec. 4, 2007
7243682 Annular one-way valve Jul. 17, 2007
7234480 Telescopic snap valve Jun. 26, 2007
7222637 Connector equipped with a valve May. 29, 2007
6988510 Disc check valve Jan. 24, 2006
6929023 Back flow prevention device for pipelines conveying fluids Aug. 16, 2005
6851448 Rotary connector with valve Feb. 8, 2005
6453941 Pipe tubular element comprising a rigid longitudinal portion and a flexible longitudinal part in one single piece Sep. 24, 2002
6382244 Reciprocating pump standing head valve May. 7, 2002
6240957 Backward flow prevention valve Jun. 5, 2001
6227299 Flapper valve with biasing flapper closure assembly May. 8, 2001
5799689 Tubular refrigerant check valve with idented outer housing portion Sep. 1, 1998
5797147 Spill-resistent urinal Aug. 25, 1998
5794661 Tank isolation valve Aug. 18, 1998
5595368 Apparatus for preventing slippage in pipe couplings Jan. 21, 1997
5592966 Back-flow preventer Jan. 14, 1997
5382142 Wall pump having backwash valve actuator Jan. 17, 1995
5365906 Fluid flow check valve for fuel system Nov. 22, 1994
5340291 Flow restraining device for a thick matter conveying apparatus Aug. 23, 1994
5318063 Fluid check valve with replaceable valve seat and flapper assembly Jun. 7, 1994
5222519 Reverse-flow prevention device for fuel tank Jun. 29, 1993
5176165 Air gap apparatus Jan. 5, 1993
5172721 Check valve for fuel tank Dec. 22, 1992
5159981 Flapper valve Nov. 3, 1992
5159953 Check valve apparatus for fuel tank Nov. 3, 1992
5123591 Radiator hose with internally mounted thermostat Jun. 23, 1992
5065791 Fluid purifying apparatus and method of purifying fluids Nov. 19, 1991
5060689 Universal check valve assembly Oct. 29, 1991
5020611 Check valve sub Jun. 4, 1991
4955949 Mud saver valve with increased flow check valve Sep. 11, 1990
4825902 Flapper valve with protective hinge pin sleeve May. 2, 1989
4823890 Reverse circulation bit apparatus Apr. 25, 1989
4776369 Check valve having snap-on clamping sleeve Oct. 11, 1988
4774981 Check valve Oct. 4, 1988
4712619 Poppet valve Dec. 15, 1987
4682661 Drilling apparatus Jul. 28, 1987
4646783 Anti-stall ball-check valve Mar. 3, 1987
4624316 Super seal valve with mechanically retained seal Nov. 25, 1986
4602655 Self-retaining check valve and mounting therefor Jul. 29, 1986
4528999 Pressure relief device for pipes Jul. 16, 1985
4492249 Mounted check valve assembly Jan. 8, 1985
4478244 Mud saver valve Oct. 23, 1984
4434811 Coupling seal and method of assembly Mar. 6, 1984

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