Dover Wilden Advanced Series Techniek, werking en onderhoud - Pagina 4
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SECTION 2
H25/1600S — HOW IT WORKS
The Wilden piston pump is an air-operated, positive displacement, self-priming pump. These drawings show the flow pattern
through the pump upon its initial stroke. It is assumed the pump has no fluid in it prior to its initial stroke.
B
B
FIGURE 1: When air pressure is supplied to the pump and
the solenoid coil is unpowered, the air valve directs air pres-
sure to the front side (A) of the power/liquid piston through
the tubing connected to the air valve. At this time, the
power/liquid piston is on its suction stroke. At the same time,
the air on the back side (B) of the power/liquid piston is being
forced out to atmosphere through the exhaust port located
towards the top of the air valve. Movement of the
power/liquid piston away from the liquid chamber creates a
vacuum within the wetted portion of the pump, atmospheric
pressure on the inlet fluid forces the inlet valve ball off its seat
and allows the fluid being pumped to fill the liquid chamber.
OUTLET
A
CLOSED
A
OPEN
INLET
B
B
FIGURE 2: When the solenoid is powered, the air valve redi-
rects pressurized air to the back side (B) of the power/liquid
piston which forces the power/liquid piston to move towards
the liquid chamber. The movement of the power/liquid piston
towards the liquid chamber moves the discharge valve ball
off its seat and allows the fluid being pumped to exit the
discharge port. At this same time, the air on the front side (A)
of the power/liquid piston is being forced out to atmosphere
through the exhaust port located towards the bottom of the
air valve. This constitutes one complete pumping cycle. The
pump may take several cycles to completely prime depend-
ing on the conditions of the application.
OUTLET
A
OPEN
CLOSED
A
INLET