WSP™
DATA SHEET
WSP™ SELF-PRIMER PUMPS
WSP-D300_8
Rev. 3
01/09/20
© 2019 The Factory
48
Figure 15: Valve in Partially Closed Position
Air from the pump casing passes through the bypass line and the air release valve to the
wet-well during the priming cycle. (Figure 14).
Figure 16: Valve in Closed Position
Once your pump is fully primed, pressure from the liquid pressing against the valve
diaphragm compresses the spring and shuts the valve (Figure 16). The valve then stays
closed, slowing the liquid bypass down to 1 to 4 gallons (3.8 to 19-liters) per minute.
ENSURE THAT THE BYPASS LINE IS DIRECTED BACK INTO THE WET-WELL OR TANK
TO PREVENT HAZARDOUS SPILLS AS SOME LEAKING (1 TO 5 GALLONS [3.8 TO 19
LITERS] PER MINUTE) WILL OCCUR WHEN THE VALVE IS IN THE FULL-CLOSED
POSITION.
The spring will automatically return the diaphragm to its open position once the pump shuts
down. Solids remaining in the chamber of the diaphragm will settle at the bottom. During
the next priming cycle, these leftover solids will be flushed out.
Summary of Contents for 8-WSP
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