Dover WILDEN A1 Series, Инженерия, эксплуатация и обслуживание, Страница: 4 / 28

WILDEN PUMP & ENGINEERING, LLC
2
WIL-10040-E-02
SECTION 2
THE WILDEN PUMP — HOW IT WORKS
The Wilden diaphragm 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.
FIGURE 1 When the solenoid is ener-
gized, the air valve directs pressure to
the back side of diaphragm A. The
compressed air is applied directly to the
liquid column separated by elastomeric
diaphragms. The diaphragm acts as a
membrane between the compressed air
and the liquid, balancing the load and
removing mechanical stress from the
diaphragm. The compressed air moves
the diaphragm away from the center
section of the pump. The opposite
diaphragm is pulled in by the shaft
connected to the pressurized
diaphragm. Diaphragm B is on its
suction stroke; air behind the diaphragm
has been forced out to the atmosphere
through the exhaust port. The move-
ment of diaphragm B toward the center
section of the pump creates a vacuum
within chamber B. Atmospheric pres-
sure forces fluid into the inlet manifold
forcing the inlet valve ball off of its seat.
Liquid is free to move past the inlet valve
ball and fill the liquid chamber (see
shaded area).
FIGURE 2 When the solenoid valve is
deenergized, the air valve redirects pres-
surized air to the back side of diaphragm
B. The pressurized air forces diaphragm
B away from the center section while
pulling diaphragm A to the center
section. Diaphragm B is now on its
discharge stroke. Diaphragm B forces
the inlet valve ball onto its seat due to
the hydraulic forces developed in the
liquid chamber and manifold of the
pump. These same hydraulic forces lift
the discharge valve ball off of its seat,
while the opposite discharge valve ball is
forced onto its seat, forcing fluid to flow
through the pump discharge. The
movement of diaphragm A toward the
center section of the pump creates a
vacuum within liquid chamber A. Atmos-
pheric pressure forces fluid into the inlet
manifold of the pump. The inlet valve
ball is forced off of its seat allowing the
fluid being pumped to fill the liquid
chamber. FIGURE 3 Once the solenoid valve is
reenergized, the air is redirected to the
back side of diaphragm A, which starts
diaphragm B on its exhaust stroke. As
the pump reaches its original starting
point, each diaphragm has gone
through one intake and one discharge
stroke. This constitutes one complete
pumping cycle. The pump may take
several cycles to completely prime
depending on the conditions of the
application.
RIGHT STROKE LEFT STROKE RIGHT STROKE