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WILDEN PUMP & ENGINEERING, LLC
WIL-11150 - E-10
The Wilden diaphragm pump is an air-operated, positive displacement, self-priming pump. These drawings show 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 air pressure is supplied
to the pump, the air valve directs pressure
to the back side of diaphragm A. 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 movement of
diaphragm B towards the center section
of the pump creates a vacuum within
chamber B. Atmospheric pressure 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 Once the shaft has reached the
end of its stroke, the air valve redirects
pressurized air to the back side of
diaphragm B.
FIGURE 3 At completion of the stroke,
the air valve again redirects air 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 exhaust and one discharge stroke.
This constitutes one complete pumping
cycle. The pump may take several cycles
to completely prime depending on the
condition of the application.
The H800 uses an integral power amplifier piston together with two diaphragms to yield a pressure ratio of 3:1 (e.g. 85 psig air
inlet will develop pump discharge pressures up to 250 psig). Air is simultaneously directed behind the amplifier piston as well as
one of the diaphragms via specialized air manifold porting. The sum of the two surface areas is three times that of the diaphragm.
Therefore, the discharge is amplified by a 3:1 pressure output ratio.
Section 3
HOW IT WORKS—PUMP
HOW IT WORKS—THE POWER PRINCIPLE
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