P U M P D I S A S S E M B L Y
The outer piston on the side of
the amplification chamber has
an air passageway at the center
of the outer piston lug. This air
passageway allows air to flow
from the opposite air chamber to
the amplification chamber. This
principle is how the HS400S high-
pressure pump achieves a 2:1 ratio
of inlet air pressure to discharge
pressure. When reassembling the
HS400S pump, the outer piston
(with the air passageway) has to be
positioned on the same side as the
amplification chamber. If it is not
reassembled correctly, the pump
will not operate and process fluid
will enter the air distribution system
through the air passageway located
at the shaft lug.
AIR PASSAGEWAY
AIR PASSAGEWAY
AIR PASSAGEWAY
This same air passageway continues through the diaphragm shaft, exits
out of the diaphragm shaft via a 90º turn and into the air chamber located
on the wetted side of the pump. The air passageway has to be positioned in
the air chamber on the wetted side of the pump, opposite the amplification
chamber.
WIL-11112-E-01
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WILDEN PUMP & ENGINEERING, LLC
