Liquid pumping, delivering and metering apparatus

Claim 1

LIQUID PUMPING, DELIVERING AND METERING APPARATUS COMPRISING A TANK FOR CONTAINING THE LIQUID, A PUMP, MEANS FOR CONNECTING THE SUCTION SIDE OF THE PUMP TO THE TANK IN ORDER TO CAUSE THE PUMP TO DELIVER THE LIQUID FROM THE TANK, A METER CONNECTED TO THE PRESSURE SIDE OF THE PUMP IN ORDER THAT THE PUMP MAY DELIVER THERETHROUGH THE LIQUID FROM THE TANK, AN AIR ELIMINATOR COMPRISING A CHAMBER HAVING AN INLET CONNECTED TO THE PRESSURE SIDE OF THE PUMP AND AN OUTLET CONNECTED TO THE METER IN ORDER THAT THE PUMP MAY DELIVER THE LIQUID FROM THE TANK TO AND THROUGH THE CHAMBER PRIOR TO DELIVERING IT THROUGH THE METER, THE CHAMBER BEING PROVIDED WITH A VALVE DISPOSED ABOVE THE INLET AND THE OUTLET THROUGH WHICH AIR IN THE CHAMBER MAY BE ELIMINATED AND A FLOAT FOR CLOSING THE VALVE WHEN THE LIQUID DELIVERED IN THE CHAMBER BY THE PUMP FROM THE TANK IS ABOVE A PREDETERMINED LEVEL, A PRESSURE DEVICE CONNECTED TO THE VALVE, AND MEANS CONTROLLED BY THE PRESSURE DEVICE UPON THE PRESSURE DEVICE BECOMING SUBJECTED TO THE PRESSURE OF THE AIR IN THE CHAMBER WHEN THE VALVE IS OPEN FOR PREVENTING THE PUMP FROM DELIVERING ANY FURTHER FLUID FROM THE TANK THROUGH THE METER, THEREBY TO PROTECT THE METER AGAINST ERRONEOUS RECORDINGS ARISING OUT OF THE DELIVERY BY THE PUMP OF AIR THROUGH THE METER.