Flow Throttle Use
Operation
11
The flow throttle is used during sampling to regulate the pressure applied to the pump.
Turning the throttle clockwise increases the pressure and counterclockwise decreases the
pressure. The pressure gauge shows the approximate pressure applied to the pump. This
allows easy adjustment of the throttle giving pressures that will produce gentle, non-
turbulent flow (normally 5-10 psi higher than the minimum requirement of 0.5 psi per foot
of pump depth). For traditional, high volume purging pressure may be increased with the
throttle to maximize pump flow during well purging.