Westco pump

Claim 1

A PUMP COMPRISING A CIRCULAR CASING, A CIRCULAR RUNNER ROTATIVELY PROVIDED WITHIN SAID CASING, A NEARLY ANNULAR SPACING FORMED AROUND THE PERIPHERY OF THE RUNNER, SAID SPACING FORMING A PUMPING PASSAGE, A SUCTION PIPE OPENING INTO THE CASING AND COMMUNICATING WITH THE PUMPING PASSAGE, SAID SUCTION PIPE HAVING AN UPSTREAM SECTION UPSTREAM OF ITS OPENING INTO SAID PUMPING PASSAGE, A DISCHARGE PIPE OPENING INTO THE CASING IN SIDE-BY-SIDE RELATION WITH THE SUCTION PIPE AND COMMUNICATING WITH THE PUMPING PASSAGE, AND ABUTMENT MEANS IN SAID PUMPING PASSAGE BETWEN SAID DISCHARGE AND SUCTION PIPES, MEANS FOR PREVENTING CAVITATIONS RESULTING FROM THE PRESSURE DECREASE IN THE BEGINNING PORTION OF SAID PUMPING PASSAGE RELATIVE TO THE PRESSURE PREVAILING IN SAID UPSTREAM SECTION BY EJECTING WATER AT RELATIVELY HIGHER PRESSURE INTO THE SAID BEGINNING PORTION INCLUDING A WATER PIPE, ONE END OF WHICH COMMUNICATES WITH THE PUMPING PASSAGE IN THE SAID BEGINNING PORTION THEREOF AND THE OTHER END OF WHICH COMMUNICATES WITH THE UPSTREAM SECTION OF SAID SUCTION PIPE, SO THAT THE PRESSURIZED WATER ENTERS THE SAID BEGINNING PORTION OF THE PUMPING PASSAGE IN BY-PASSING RELATIONSHIP TO THE FLOW OF LIQUID THROUGH SAID OPENING OF SAID SUCTION PIPE INTO SAID PUMPING PASSAGE.