VERDERAIR_VA-C manual_rev2_2020_UK_(uk) | 1.12.2020
11
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 18.
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.
Figure 3.1: air-valve tool
Figure 3.2:
plug tools
Special tools to easy disassemble the valve plugs
(9) can be ordered separately. See figure 3.2.
