Air Regulators
When an air pump has product in it, the loading of the diaphragm is balanced on the air and liquid sides. But when the pump is empty and the liquid pressure is nil the pump runs excessively fast causing mechanical stress to the diaphragms and early failure. The regulator should be fitted to the line and preset approximately 10 PSI higher than the required pumping pressure, this ensures minimum damage in the event of extensive dry running. The regulator is often incorrectly used for flow control, this is unsuitable due to possible changes in Head Loss caused by altering viscosity, affecting the flow rate up or down and also this usually means the air pressure is set too close to the operating pressure causing regular stalling.
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