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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
4428396 Adjustable valve assembly Jan. 31, 1984
4286573 Water heater heat trap assembly Sep. 1, 1981
4257444 Insert check valve or the like Mar. 24, 1981
4248264 Internal mud saver valve Feb. 3, 1981
4129145 Check valve assembly Dec. 12, 1978
4067358 Indexing automatic fill-up float valve Jan. 10, 1978
4040488 Differential valve Aug. 9, 1977
3995692 Continuous orifice fill device Dec. 7, 1976
3957114 Well treating method using an indexing automatic fill-up float valve May. 18, 1976
3955542 Water injector valve and regulator May. 11, 1976

1 2

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