Regulating valve for a pump controlled by a pressure responsive switch

Claim 1

APPARATUS FOR THE DELIVERY OF LIQUID INCLUDING AN ELECTRIC MOTOR, A PUMP DRIVEN BY SAID MOTOR, A PIPE IN WHICH SAID PUMP DISCHARGES UNDER PRESSURE SAID LIQUID, DRAWING COCKS CONNECTED TO SAID PIPE, A PRESSURE REDUCING VALVE MOUNTED ON SAID PIPE BETWEEN THE PUMP AND THE COCKS AND INCLUDING A CHAMBER, A LEAD-IN PIPE CONNECTED WITH THE PUMP AND OPENING IN SAID CHAMBER TO FORM A SEAT THEREIN AT THE OPEN END OF THE PIPE, AN OUTLET PIPE CONNECTED WITH THE DISCHARGE PIPE, A VALVE MEMBER ADAPTED TO CLOSE THE SEAT OF THE LEAD-IN PIPE AND SUBJECTED, IN THE DIRECTION OF THE CLOSING, TO THE PRESSURE EXISTING IN THE DISCHARGE PIPE DOWNSTREAM OF SAID VALVE, A CALIBRATED SPRING ACTING UPON SAID VALVE MEMBER IN THE DIRECTION OF THE OPENING, A PASSAGE HAVING A SMALL SECTION PROVIDED IN SAID LEAD-IN PIPE TO ESTABLISH DIRECT COMMUNICATION BETWEEN THE PUMP AND THE INSIDE OF THE CHAMBER OF THE RELIEF-VALVE AND INCLUDING FLOW DIRECTION SELECTING MEANS FOR PREVENTING FLOW OF LIQUID FROM THE VALVE CHAMBER TO THE LEAD IN PIPE AND A PRESSURE SWITCH CONNECTED WITH THE DISCHARGE PIPE DOWNSTREAM OF THE PRESSURE REDUCING VALVE AND CONTROLLING THE STARTING AND THE STOPPING OF THE ELECTRIC MOTOR OF THE PUMP.