Cleaning apparatus with relief control valve

Claim 1

IN A CLEANING APPARATUS: (A) PUMP MEANS HAVING A LIQUID INLET AND A LIQUID OUTLET, SAID PUMP MEANS TAKING LIQUID THEREINTO AT ITS INLET AND DISCHARGING SUCH LIQUID THROUGH ITS OUTLET; (B) FIRST CONDUIT MEANS CONNECTED TO SAID PUMP MEANS INLET AND BEING ADAPTED TO BE CONNECTED TO A FIRST SOURCE OF LIQUID; (C) CONTROL VALVE MEANS INTERPOSED WITHIN SAID FIRST CONDUIT MEANS FOR CONTROLLING THE FLOW OF LIQUID FROM SUCH FIRST SOURCE OF LIQUID; (D) SECOND VALVE MEANS CONTROLLING THE FLOW OF FLUID THERETHROUGH; (E) SECOND CONDUIT MEANS CONNECTED TO SAID PUMP MEANS INLET AND ADAPTED TO BE CONNECTED TO A SECOND SOURCE OF LIQUID, SAID SECOND CONDUIT MEANS HAVING SAID SECOND VALVE MEANS DISPOSED THEREIN CONTROLLING THE FLOW OF SUCH LIQUID TO BE DRAWN FROM SAID SOURCE; (F) RELIEF VALVE MEANS HAVING A LIQUID INLET AND OUTLET CONNECTED TO SAID LIQUID OUTLET AND INLET RESPECTIVELY OF SAID PUMP MEANS, SAID RELIEF VALVE OPERATING FROM A CLOSED CONDITION TO AN OPEN CONDITION UPON THE PRESSURE THEREIN REACHING A FIRST PREDETERMINED MAGNITUDE AND OPERATING FROM AN OPEN CONDITION TO A CLOSED CONDITION UPON THE PRESSURE THEREIN DROPPING TO A SECOND PREDETERMINED MAGNITUDE; (G) LIQUID DISCHARGE MEANS CONNECTED TO SAID LIQUID OUTLET OF SAID PUMP MEANS HAVING A CONTROL ELEMENT THEREIN FOR CLOSING AND OPENING A LIQUID PASSAGE THEREIN CAUSING THE PRESSURE IN SAID RELIEF VALVE MEANS TO RISE TO SAID FIRST PREDETERMINED MAGNITUDE OR FALL TO SAID SECOND PREDETERMINED MAGNITUDE; (H) AND MEANS REMOTE FROM SAID CONTROL VALVE MEANS FOR CONTROL THEREOF CAUSING SAID PUMP MEANS TO DRAW LIQUID FROM SAID FIRST SOURCE WHEN SAID CONTROL VALVE IS OPEN AND CAUSING SAID PUMP MEANS TO DRAW LIQUID FROM SAID SECOND SOURCE WHEN SAID CONTROL VALVE IS CLOSED.