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Class Information
Number: 137/527.2
Name: Fluid handling > Line condition change responsive valves > Direct response valves (i.e., check valve type) > Pivoted valves > Head retained by removable closure
Description: Devices in which the valve casing is provided with a removable closure element which retains the valve head in assembled relation with its seat.

Patents under this class:

Patent Number Title Of Patent Date Issued
8567435 Centreline flow valve Oct. 29, 2013
8490648 Check valve Jul. 23, 2013
8453672 Passive valve for attenuation of low frequency noise Jun. 4, 2013
8261771 Flowline flapper valve Sep. 11, 2012
8028715 Check valve for vacuum sewage pipe and vacuum sewage system Oct. 4, 2011
7784489 Check valve for a self-priming pump Aug. 31, 2010
7757706 Backwater valve assembly with removable valve member Jul. 20, 2010
7686031 Hydrant shoe with backflow prevention assembly Mar. 30, 2010
7520294 Hydrant shoe with backflow prevention assembly Apr. 21, 2009
7249611 Check valve Jul. 31, 2007
7152622 Check valve Dec. 26, 2006
6694996 Swing check backflow preventor having check valve with lever arm Feb. 24, 2004
6679290 Swing check valve Jan. 20, 2004
6679289 Swing check valve Jan. 20, 2004
6328062 Torsion spring connections for downhole flapper Dec. 11, 2001
6314993 Swing check valve Nov. 13, 2001
6050294 Spring return check valve Apr. 18, 2000
5947152 Check valve and backflow preventer Sep. 7, 1999
5794655 Swing-type check valve assembly having an integrated valve seat and valve housing cover Aug. 18, 1998
5711341 Swing-type check valve assembly retained within a valve housing by abutting engagement with a valve cover and a port of the valve housing Jan. 27, 1998
5709240 Check valve and backflow preventer Jan. 20, 1998
5236007 Top-entry check valve having retainer ring Aug. 17, 1993
5156183 Top-entry check valve having spring retainer Oct. 20, 1992
5131432 Dishwasher with discharge pump and nonreturn valve Jul. 21, 1992
5056548 Check valve assembly with removable seat Oct. 15, 1991
4842014 Check valve hanger mechanism Jun. 27, 1989
4694853 Wafer check valves Sep. 22, 1987
4552174 Spring-loaded check valve Nov. 12, 1985
4266569 Check valve May. 12, 1981
4259983 Cleanout fitting with lockable and removable check valve Apr. 7, 1981
4252144 Tilting disk check valve Feb. 24, 1981
4141381 Swing check valve Feb. 27, 1979
4054153 Check valve Oct. 18, 1977

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