WIL-12350-E-02 3 WILDEN PUMP & ENGINEERING, LLC
Section 3
HOW IT WORKS—PUMP DISTRIBUTION SYSTEM
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 pres-
sure 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 pressur-
ized 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 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 redi-
rects 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.
HOW IT WORKS—THE POWER PRINCIPLE
The H1500 Saniflo™ HS uses an integral power amplifier piston
together with two diaphragms to yield a pressure ratio of 3:1 [e.g.,
5.9 bar (85 psig) air inlet will develop pump discharge pressures up
to 17.2 bar (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.
B B BA A A
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