F stoermer

Claim 1

A PUMP COMPRISING A CASING HAVING A GENERALLY CYLINDRICAL BODY PORTION AND HAVING LATERALLY EXTENDING BOSS PORTIONS AT ONE END THEREOF, A CONDUIT MEANS DEFINING A STRAIGHT LINE PASSAGE EXTENDING THROUGH SAID BODY PORTION AND SAID BOSS PORTIONS AND HAVING AN INLET AND AN OUTLET DISPOSED IN COAXIAL LINE WITH ONE ANOTHER AT OPPOSITE ENDS OF SAID PASSAGE AND INCLUDING MEANS TO RECEIVE CONDUIT MEMBERS IN COUPLED CONNECTION THEREWITH, A CHECK VALVE IN SAID PASSAGE BETWEEN SAID INLET AND SAID OUTLET, WHEREBY THROUGH FLOW THROUGH SAID PASSAGE MAY BE ACCOMMODATED WHEN THE PUMP IS OUT OF OPERATION, SAID BODY PORTION OF SAID CASING HAVING FORMED THEREIN A PUMPING CHAMBER SPACED ADJACENT SAID CONDUIT MEANS AND HAVING MEANS COMMUNICATING SAID PUMPING CHAMBER WITH SAID PASSAGE ON OPPOSITE SIDES OF SAID CHECK VALVE, POSITIVE DISPLACEMENT ROTARY PUMPING MEANS IN SAID PUMPING CHAMBER FOR MOVING FLUID FROM SAID INLET AT INCREASED PRESSURE TO SAID OUTLET, A CAN-SHAPED MOTOR COVER HAVING CIRCUMFERENTIAL SIDE WALLS CONNECTED TO SAID CASING AND FORMING THEREWITH A MOTOR COMPARTMENT, A DIRECT CURRENT MOTOR IN SAID COMPARTMENT HAVING A COMMUTATOR AND BRUSH MEANS FOR ELECTRICALLY ENERGIZING THE MOTOR FROM A SOURCE OF DIRECT CURRENT, SAID MOTOR HAVING A ROTATABLE SHAFT AND A DIRECT SEAL-LESS COUPLING CONNECTION TO SAID PUMPING MEANS, A PASSAGE FORMED IN SAID CASING EXTENDING FROM THE INTERIOR OF SAID MOTOR COMPARTMENT AND INTERSECTING SAID STRAIGHT LINE PASSAGE ON THE OUTLET SIDE OF SAID CHECK VALVE, SAID PASSAGE BEING COUNTERBORED TO FORM A SPRING BOTTOMING SHOULDER THEREIN, A CONTROL SPRING IN SAID PASSAGE HAVING ONE END BOTTOMED AGAINST SAID SPRING BOTTOMING SHOULDER, A MOVABLE VALVE ELEMENT IN SAID PASSAGE BOTTOMED AGAINST THE OTHER END OF SAID SPRING, AN APERTURED BUSHING HAVING A VALVE SEAT FORMED THEREIN, SAID BUSHING AND THE WALLS OF SAID PASSAGE HAVING SCREW THREADS FOR ADJUSTABLY THREADING SAID BUSHING AGAINST THE SPRING BIASED VALVE ELEMENT, THEREBY TO FORM A REGULATING VALVE IN SAID PASSAGE, SAID BOSS MEANS HAVING FORMED THEREIN AN ACCESS OPENING IN REGISTER WITH SAID PASSAGE BUT ON THE OPPOSITE SIDE OF SAID STRAIGHT LINE PASSAGE, A REMOVABLE PLUG IN SAID ACCESS OPENING, WHEREBY ACCESS TO SAID BUSHING FOR ADJUSTMENT OF THE BYPASS FLOW RATE IS FACILITATED, SAID VALVE OPERATING TO REGULATE THE PRESSURE OF THE PUMP BY DIRECTING EXCESS FLOW INTO SAID MOTOR COVER, AND MEANS FORMING A RETURN PASSAGE EXTENDING FROM SAID MOTOR COMPARTMENT AND INTERSECTING SAID STRAIGHT LINE PASSAGE ON THE INLET SIDE OF SAID CHECK VALVE, WHEREBY FLUID BYPASSING THROUGH SAID MOTOR COMPARTMENT WILL COOL THE MOTOR, AND FLAME-ARRESTING MEANS IN SAID RETURN PASSAGE.