Alternating check valve arrangement

Claim 1

A DEVICE OF THE CHARACTER DESCRIBED COMPRISING HOLLOW CASING MEANS PROVIDED WITH OPPOSITE INLET ENDS AND OUTLET MEANS EXTENDED THRU THE WALL OF THE CASING MEANS, TUBULAR MEANS EXTENDED CONVERGENTLY FROM THE OPPOSITE ENDS AND COMMUNICATING WITH THE HOLLOW OF THE CASING, THE OUTER WALL SURFACES OF SAID TUBULAR MEANS FORMING SEATS, SLEEVE VALVE MEANS SHIFTABLE LONGITUDINALLY OF SAID TUBULAR MEANS AND INCLUDING ANNULAR SKIRT MEANS MADE OF DEFORMABLE MATERIAL CAPABLE OF RESUMING FORM AFTER BEING DEFORMED, SAID SKIRT MEANS SURROUNDING AND PROJECTING FORWARDLY OF VALVE SEAT MEANS DISPOSED TRANSVERSELY TO THE HOLLOW SLEEVE VALVE MEANS FORMING CLOSURE MEANS ARRANGED TO SEAT ALTERNATELY AGAINST RESPECTIVE INNER ENDS OF EITHER CONVERGENT SEAT MEANS ACCORDING TO RELATIVE CONDITIONS OF PRESSURE IN SAID INLETS, THE INNER ENDS OF THE CONVERGING TUBULAR SEAT MEANS BEING SPACED APART AND ARRANGED TO BE EXTENDED INTO AT LEAST ONE SKIRTED END OF SAID SLEEVE VALVE MEANS AT ALL TIMES, THE HOLLOW OF SAID CASING MEANS CLEARING THE OUTER DIAMETER OF SAID SLEEVE VALVE MEANS TO PERMIT PASSAGE OF PRESSURE FLUID FROM EITHER INLET END TO SAID OUTLET MEANS, WHEREBY FLUID PRESSURE INSIDE SAID CASING MEANS IS EFFECTIVE TO COMPRESS RESPECTIVE SKIRT MEANS AROUND THE OUTSIDE OF THAT TUBULAR VALVE SEAT MEANS THAT IS SUBJECT TO A LOWER PRESSURE, THE OPPOSITE TUBULAR SEAT MEANS PROJECTING POSITIVE FLUID PRESSURE INSIDE OF AND EXPANDING ITS ASSOCIATED SKIRT MEANS TO PERMIT FLUID FLOW INTO THE HOLLOW OF SAID CASING MEANS.

Claim 2

A DEVICE OF THE CHARACTER DESCRIBED COMPRISING HOLLOW CASING MEANS PROVIDED WITH OPPOSITE INLET ENDS AND OUTLET MEANS EXTENDED THRU THE WALL OF THE CASING MEANS, TUBULAR MEANS EXTENDED CONVERGENTLY FROM THE OPPOSITE ENDS AND COMMUNICATING WITH THE HOLLOW OF THE CASING, THE OUTER WALL SURFACES OF SAID TUBULAR MEANS FORMING SEATS, SLEEVE VALVE MEANS SHIFTABLE LONGITUDINALLY OF SAID TUBULAR MEANS AND INCLUDING ANNULAR SKIRT MEANS MADE OF DEFORMABLE MATERIAL CAPABLE OF RESUMING FORM AFTER BEING DEFORMED, SAID SKIRT MEANS SURROUNDING AND PROJECTING FORWARDLY OF VALVE SEAT MEANS DISPOSED TRANSVERSELY TO THE HOLLOW SLEEVE VALVE MEANS FORMING CLOSURE MEANS ARRANGED TO SEAT ALTERNATELY AGAINST RESPECTIVE INNER ENDS OF EITHER CONVERGENT SEAT MEANS ACCORDING TO RELATIVE CONDITIONS OF PRESSURE IN SAID INLETS, THE INNER ENDS OF THE CONVERGING TUBULAR SEAT MEANS BEING SPACED APART AND ARRANGED TO BE EXTENDED INTO AT LEAST ONE SKIRTED END OF SAID SLEEVE VALVE MEANS AT ALL TIMES, THE HOLLOW OF SAID CASING MEANS CLEARING THE OUTER DIAMETER OF SAID SLEEVE VALVE MEANS TO PERMIT PASSAGE OF PRESSURE FLUID FROM EITHER INLET END TO SAID OUTLET MEANS, WHEREBY FLUID PRESSURE INSIDE SAID CASING MEANS IS EFFECTIVE TO COMPRESS RESPECTIVE SKIRT MEANS AROUND THE OUTSIDE OF THAT TUBULAR VALVE SEAT MEANS THAT IS SUBJECT TO A LOWER PRESSURE, THE OPPOSITE TUBULAR SEAT MEANS PROJECTING POSITIVE FLUID PRESSURE INSIDE OF AND EXPANDING ITS ASSOCIATED SKIRT MEANS TO PERMIT FLUID FLOW INTO THE HOLLOW OF SAID CASING MEANS.