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Class Information
Number: 137/515.3
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 > Valve seat threaded into a coupling element
Description: Devices in which a separate valve seat element is threaded into one of the coupling elements

Patents under this class:

Patent Number Title Of Patent Date Issued
7104276 Valve with reversible valve seat for high-pressure pump (HP) Sep. 12, 2006
7040669 Fuel feeding pipe May. 9, 2006
6883538 Flow control valve coupling structure Apr. 26, 2005
5174327 In-line check valve Dec. 29, 1992
4953622 Subterranean well casing float tool Sep. 4, 1990
4872510 Subterranean well casing float tool Oct. 10, 1989
4712619 Poppet valve Dec. 15, 1987

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