Fluid mixing and proportion maintaining apparatus

Claim 1

FLUID MIXING APPARATUS, FOR CONTROLLING THE PROPORTIONING OF TWO INTERMIXED FLUIDS, COMPRISING, IN COMBINATION, A FIRST FLUID INLET LINE FOR A FIRST FLUID; A FIRST PRESSURE REGULATOR IN SAID FIRST FLUID INLET LINE; A SECOND FLUID INLET LINE FOR A SECOND FLUID; A SECOND PRESSURE REGULATOR IN SAID SECOND FLUID INLET LINE; BOTH PRESSURE REGULATORS CLOSING RESPONSIVE TO DOWNSTREAM PRESSURE IN EXCESS OF THE PRESSURE REGULATOR SETTING, AND SAID FIRST PRESSURE REGULATOR BEING ADJUSTED TO OPEN SLIGHTLY IN ADVANCE OF SAID SECOND PRESSURE REGULATOR; A HEADER COMMONLY COMMUNICATING WITH BOTH OF SAID FLUID INLET LINES DOWNSTREAM OF SAID PRESSURE REGULATORS; A PRESSURE RESPONSIVE SNAP ACTION VALVE HAVING ITS INLET CONNECTED TO SAID HEADER; A FLUID MIXTURE RECEIVER CONNECTED TO THE OUTLET OF SAID SNAP ACTION VALVE; AND MEANS INTERCONNECTING SAID RECEIVER AND SAID SNAP ACTION VALVE AND EFFECTIVE TO APPLY, TO SAID SNAP ACTION VALVE, THE PRESSURE WITHIN SAID RECEIVER TO SNAP SAID SNAP ACTION VALVE CLOSED WHEN SAID PRESSURE EXCEEDS A FIRST PRE-SET VALVE THEREBY CLOSING SAID FIRST AND SECOND PRESSURE REGULATORS AND TO SNAP SAID SNAP ACTION VALVE OPEN WHEN SAID PRESSURE DROPS TO A SECOND PREDETERMINED VALVE THEREBY CLOSING SAID FIRST AND SECOND PRESSURE REGULATORS.