US PATENT SUBCLASS 137 / 515.7
.~.~.~ Valve seat clamped between coupling elements

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
515  DF  .~.~ In couplings for coaxial conduits, e.g., drill pipe check valves {3}
515.7.~.~.~ Valve seat clamped between coupling elements

DEFINITION

Classification: 137/515.7

(under subclass 515) Devices in which the valve seat element is clamped between separable elements of the coupling means.