Fluid system

Claim 1

IN COMBINATION, A MAIN TANK, AN AUXILIARY RESERVOIR MOUNTED ABOVE SAID MAIN TANK AND BEING VENTED TO THE ATMOSPHERE, A CONDUIT INTERCONNECTING SAID TANK AND RESERVOIR, A LIQUID NORMALLY FILLING SAID AND CONDUIT AND PARTIALLY FILLING SAID RESERVOIR, SAID CONDUIT EXTENDING INTO SAID RESERVOIR ABOVE THE LIQUID LEVEL THEREIN AND HAVING AN OPEN TOP END, A RESTRICTED ORIFICE ASSOCIATED WITH SAID CONDUIT IN THE VICINITY OF SAID AUXILIARY RESERVOIR FOR LIMITING DOWNWARD FLOW OF LIQUID THROUGH SAID CONDUIT FROM SAID AUXILIARY RESERVOIR TO SAID MAIN TANK, A VALVE IN SAID CONDUIT BETWEEN SAID ORIFICE AND SAID MAIN TANK, AND A FLOAT IN SAID CONDUIT BETWEEN SAID VALVE AND SAID MAIN TANK FOR NORMALLY MAINTAINING SAID VALVE OPEN, SAID FLOAT ACTING TO CLOSE SAID VALVE IN RESPONSE TO THE PARTIAL EMPTYING OF SAID CONDUIT BY LIQUID FLOW THEREFROM INTO SAID MAIN TANK AT A RATE GREATER THAN SAID ORIFICE WILL PERMIT LIQUID TO FLOW FROM SAID AUXILIARY RESERVOIR INTO SAID CONDUIT.