To Start:  Fully open the water supply valve and the discharge valve.  Next fully open the steam valve.  If water continues to come out of overflow connection throttle the water supply valve until it stops.  On low pressure operation it may be necessary to throttle the water supply valve in order to establish injector operation.  On high pressure operation it is satisfactory to throttle the steam valve until the water supply pipe is primed, but under all other conditions the steam valve should be wide open, and regulation of flow governed by the water supply valve.

To Stop:  Close the steam valve.  The water supply valve need not be closed unless supply water is under pressure.  The discharge line valve needs to be closed only as a precautionary measure as the check valve will prevent back flow from the boiler.