(under subclass 565.13) Subject matter including (a) a valve head having a face and (b) a nonreturn element wherein the nonreturn element is responsive to pressure of a line fluid. [figure] [caption]Figure 1: A typical example of the subject matter. A - Discharge; B - Tank or reservoir; C - Outlet hose assembly; D - Inlet; E - Inlet valve; F - Flexible hose; G - Check valve; P - Pump.
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511+, for a direct response check valve.
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210, Liquid Purification or Separation,
136, for a fluid pressure or material level responsive flow control system including a check valve.