Sump pump

Claim 1

IN A FLUID HANDLING SYSTEM, A CHECK VALVE FOR PREVENTING FLOW OF FLUID IN ONE DIRECTION WHILE ALLOWING SUBSTANTIALLY UNOBSTRUCTED FLOW IN THE REVERSE DIRECTION, SAID CHECK VALVE COMPRISING A HOLLOW CYLINDRICAL BODY OF RESILIENT MATERIAL, A PLURALITY OF SEGMENTED SEPARATE MEMBERS INTEGRAL WITH SAID BODY AND DEFINING INTERFITTING SEALING ELEMENTS SPACED RADIALLY INWARDLY FROM THE OUTSIDE SURFACE OF THE CYLINDRICAL BODY, SAID BODY PORTION INCLUDING MEANS DEFINING A PASSAGEWAY THROUGH THE CYLINDRICAL SURFACE OF SAID BODY WHEREBY FLUIDS MAY ENTER THERETHROUGH, SAID ELEMENTS INCLUDING SEAL FACES RECEIVED IN WEDGED SEALILNG RELATIONSHIP AND DEFINING A SPHERE-SHAPED DOME WITH THE COMMON POINT OF INTERSECTION OF SAID SEALING ELEMENTS BEING SPACED FROM SAID BODY, EACH SAID SEALING ELEMENT HAVING A THICKNESS CROSSSECTION AT ITS JUNCTION WITH THE BODY WHICH IS LESS THAN THE THICKNESS CROSS-SECTION THEREOF AT SAID COMMON POINT OF INTERSECTION, SAID SEALING ELEMENTS BEING OF A RESILIENT FLUID IMPERMEABLE MATERIAL FOR MOVEMENT TO AN OPEN POSIOTION GENERALLY IN A PLANE CONINCIDING WITH THE PLANE OF SAID BODY TO ALLOW FLOW THROUGHT THE SURFACE OF SAID BODY PROFACES, AND MEANS ON THE OUTER SURFACE OF SAID BODY PROVIDING A LOCATING PROJECTION ADAPTED TO BE RECEIVED IN A LOCATING RECESS OF A HOUSING FOR MAINTAINING SAID VALVE PROPERLY ORIENTED IN SAID FLUID HANDLING SYSTEM.