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5. VA-C pumps are dry self-priming. So they don't
need to be filled before first use. The figures of
the possible suction heights can be found in the
technical information. (see page 25).
6. VA-C pumps will building up pressure at
the liquid side up to the pressure set on the
compressed air-inlet of the pump. If this
pressure is higher than the rated pressure of the
discharge line, a pressure relief valve or another
pressure safety equipment should be installed at
the discharge side of the pump.
7. VA-C pumps can stall against a closed
discharge line without damage. The pump will
stop working when the pressure at the liquid
side of the diaphragms is equal (or higher) then
the compressed air pressure at the air-side of
the diaphragm. As soon the pressure at the
liquid side will drop below the compressed air
pressure, the pump will restart automatically.
Due to internal losses, occasionally the pump can
make a stroke during stalling.
OPERATION
Pressure relief procedure
MPa/bar/PSI
Trapped air can cause the pump to cycle
unexpectedly, which could result in serious injury
from splashing.
1. Shut off the air supply to the pump.
2. Open the dispensing valve, if used.
3. Open the fluid drain valve to relieve fluid
pressure. Have a container ready to catch the
drainage.
Flush pump before first use
The pump was tested before leaving the factory.
Residue of the testing water can be left in the
pump. To avoid contamination, flush the pump
before first use.
Starting and adjusting the pump
1. Be sure the pump is properly grounded.See
page 8 for proper grounding.
2. Check fittings to be sure they are tight. Tighten
fluid inlet and outlet fittings securely.
3. Place the suction tube (if used) in fluid
to be pumped.
NOTE: If fluid inlet pressure to the pump is more
than 25% of outlet working pressure, the ball
check valves will not close fast enough, resulting in
inefficient pump operation.
4. Place the end of the fluid hose into an
appropriate container.
5. Close the fluid drain valve.
6. Back out the air regulator knob, and open all
bleed-type master air valves.
8. Slowly increase air pressure with the air
regulator until the pump starts to cycle. Allow
the pump to cycle slowly until all air is pushed
out of the lines and the pump is primed. Trapped
air can cause the pump to cycle unexpectedly,
which could result in serious injury from
splashing.
9. If you are flushing, run the pump long enough to
thoroughly clean the pump and hoses.
10. Close the bleed-type master air valve.
Pump shutdown
MPa/bar/PSI
At the end of the work shift and before you check,
adjust, clean or repair the system, follow Pressure
Relief Procedure, in the left column here.
VERDERAIR_VA-C manual_rev2_2020_UK_(uk) | 1.12.2020
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