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Special precautions
1. When medium is left in the pump
chambers, this can generate chemical
reactions when pumping another fluid.
Always flush pumps with a neutral fluid
before changing from medium.
2. Take care liquids left in the pump chamber
can't freeze, this can damage the pump.
3. It is possible to run the pumps on
nitrogen gas instead of compressed air.
Take care about sufficient ventilation
around the pump as the exhaust of
the pump will put nitrogen gas in the
atmosphere.
4. Using the pump submerged: It is
necessary to connect the air outlet of
the pump to the atmosphere be using
a flexible hose, to prevent liquid to
enter the air side of the pump. Take in
consideration , all external parts of the
pump must be 100% resistance to the
medium where the pump is placed in.
Special care have to been taken the pump
is standing 100% vertical and can't start
to float in all circumstances.
5. In case of big changes in temperature
while operating, it is necessary to control
the tension on the bolts carefully. Sudden
big temperature shocks can cause over or
under tightening of the pump and will lead
to leaks and/or damage the pump.
mAINTENANCE / REPAIR
Flushing and storage
Flush the pump often enough to prevent
the fluid you are pumping from drying
or freezing in the pump and damaging
it. Always flush the pump and follow the
Pressure relief Procedure on page 10
before storing it for any length of time.
Use a compatible flushing agent.
Tightening Threaded connections
Before each use, check all hoses for wear
or damage and replace as necessary. Check
to be sure all threaded connections are tight
and leak-free. Tighten and retorque the
pump if necessary. Use torque values on
page 22
Preventive maintenance schedule
Establish a preventive maintenance
schedule, based on the pump's service
history. This is especially important for
prevention of spills or leakage due to
diaphragm failure.
Disassembly
IMPORTANT:
Follow the Pressure Relief Procedure
at page 10 before starting to work at the
pump !
After a diaphragm rupture always make
sure no liquid is left at the air side of the
pump. Especially the muffler (07) have
to be checked before opening the pump.
The fluid side of the range of VA-C pumps
are built together the same way. The only
difference are the number of assembly (23)
pins used. VA-C pumps are having different
right and left side housings (02 and 03).
1. The center section has the same built up
for VA-C50 and VA-C130. The air valves
for the VA-C10 and the VA-C20 are not
having an air valve shaft. On those pumps
the diaphragm shaft (19) is also used as
piston shaft. Due to this the VA-C10 and
VA-C20 are not having diaphragm shaft
o-rings and diaphragm shaft bearings (20)
mounted in the center housing.
Every Verderair CONT-EX pump is delivered
with a tool to disassemble the air valve.
Special tools to easy disassemble the valve
plugs (9) can be ordered separately. See
figure 3.2.
VA-C_man rev01-2016_VI_(uk) | 1.02.2017
Figure 3.1: air-valve tool
Figure 3.2:
plug tools
11
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