Dover WILDEN BioPharm T2/HAAB/TF/TF/HTF-900 Engineering, Operation & Maintenance - Page 13
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SECTION 8B – TURBO-FLO™ PUMPS
AIR VALVE / CENTER SECTION
REPAIR / MAINTENANCE
The air valve assembly consists of the air valve body and
piston. The unique design of the air valve relies only on differ-
ential pressure to cause the air valve to shift. It is reliable and
simple to maintain. The bushing in the center block, along with
the diaphragm shaft, provides the "trigger" to tell the air valve
to shift. The following procedure will ensure that the air valve on
your Wilden pump will provide long trouble-free service.
AIR VALVE BODY AND PISTON
ASSEMBLY AND DISASSEMBLY
The air valve body and piston can be disconnected from the
pump by removing the four socket-head cap screws which
attach it to the center section. The piston in the air valve is
aluminum with a dark anodized coating. The piston should
move freely and the ports in the piston should line up with the
ports on the face of the air valve body. The piston should also
appear to be dull black in color. If the piston appears to be a
shiny aluminum color, the air valve is probably worn beyond
working tolerances and should be replaced.
If the piston does not move freely in the air valve, the entire air
valve should be immersed in a cleaning solution. (NOTE: Do not
GLYD™ RING REPLACEMENT/
CENTER SECTION
The pump's center section consists of a molded housing with
a bronze bushing. (Bushing is not removable.) This bushing has
grooves cut into the inside diameter. Glyd™ rings are installed
in these grooves. When the Glyd™ rings become worn, they
will no longer seal and must be replaced.
force the piston by inserting a metal object.) This soaking
should remove any accumulation of sludge and grit which is
preventing the air valve piston from moving freely. If the air
valve piston does not move freely after the above cleaning, the
air valve should be disassembled as follows: Remove the snap
ring from the top end of the air valve and apply an air jet alter-
nately to the two holes located in the face of the air valve until
the end cap is blown out. [CAUTION: The air valve end cap
may come out with considerable force. Hand protection such
as a padded glove or a rag should be used to capture the end
cap.] Inspect the piston and cylinder bore for nicks and scor-
ing.
Small nicks can usually be dressed out and the piston returned
to service. Inspect the cylinder end caps. Make sure that the
guide pin is straight and smooth or the piston will not move freely
in the cylinder. Clean out anti-centering pin holes located on
each side of the piston. Pin holes are located on each side of the
annular groove on the top of the piston and travel to each end.
New o-rings should be installed on the end caps. Lubricate the
o-rings and install the end caps, assuring that proper alignment
of the piston and cylinder ports is maintained. Use an oil with
arctic characteristics (ISO 15-5wt).
ENHANCED SHAFT
11
1
3
6
8
ENHANCED CONFIGURATION
WILDEN PUMP & ENGINEERING, LLC