WIL-11060-E-03
Wilden
®
6
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
The air valve directs pressurized air
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 separation membrane
between the compressed air and liquid,
balancing the load and removing mechanical
stress from the diaphragm. The compressed air
moves the diaphragm away from the center
block 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 of the pump. The movement of
diaphragm B toward the center block of the
pump creates a vacuum within chamber B.
Atmospheric pressure forces fluid into the inlet
manifold forcing the inlet valve ball off its seat.
Liquid is free to move past the inlet valve ball and
fill the liquid chamber (see shaded area).
FIGURE 2
When the pressurized diaphragm,
diaphragm A, reaches the limit of its discharge
stroke, the air valve redirects pressurized air to
the back side of diaphragm B. The pressurized
air forces diaphragm B away from the center
block while pulling diaphragm A to the center
block. 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 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 block of the pump creates a
vacuum within liquid chamber A. Atmospheric
pressure forces fluid into the inlet manifold of
the pump. The inlet valve ball is forced off its
seat allowing the fluid being pumped to fill the
liquid chamber.
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
conditions of the application.
HOW IT WORKS
— AIR DISTRIBUTION SYSTEM
The Pro-Flo
®
patented air distribution system incorporates
three moving parts: the air valve spool, the pilot spool, and the
main shaft/diaphragm assembly. The heart of the system is the
air valve spool and air valve. As shown in Figure A, this valve
design incorporates an unbalanced spool. The smaller end of
the spool is pressurized continuously, while the large end is
alternately pressurized then exhausted to move the spool. The
spool directs pressurized air to one air chamber while
exhausting the other. The air causes the main shaft/diaphragm
assembly to shift to one side
— discharging liquid on that side
and pulling liquid in on the other side. When the shaft reaches
the end of its stroke, the inner piston actuates the pilot spool,
which pressurizes and exhausts the large end of the air valve
spool. The repositioning of the air valve spool routes the air to
the other air chamber.
Section 3
HOW IT WORKS
— PUMP
Summary of Contents for WILDEN A200B Advanced Plastic
Page 19: ...WIL 11060 E 03 Wilden Notes...
