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Class Information
Number: 166/332.6
Name: Wells > Valves, closures or changeable restrictors > Longitudinally movable operator > Having a dump or discharge type means
Description: Longitudinally moveable operator wherein the flow regulating member includes a passage to allow excess fluid to escape.


Patents under this class:

Patent Number Title Of Patent Date Issued
6811353 Aquifer recharge valve and method Nov. 2, 2004
6666270 Reciprocating pump vent-dump valve and methods of use Dec. 23, 2003
6328112 Valves for use in wells Dec. 11, 2001
6269874 Electro-hydraulic surface controlled subsurface safety valve actuator Aug. 7, 2001
5479988 Mud check valves in drilling apparatus (wells) Jan. 2, 1996
4856756 Well bottom release valve Aug. 15, 1989
4645007 Tubing drain valve Feb. 24, 1987



 
 
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