VA-C_man rev01-2016_VI_(uk) | 1.02.2017
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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 21).
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.
Flushpumpbeforefirstuse
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.
