VERDERAIR_VA-C manual_rev2_2020_UK_(uk) | 1.12.2020
17
Problem
Cause
Solution
Pumps cycles at stall or falls to
hold pressure at stall.
- Worn check valves and/or
o-rings
- Replace worn parts.
Pump will not cycle, or cycle once
and stops.
- Air valve is dirty.
- Air valve is leaking
- Air valve is blocked
- Check if valve ball is not
sticked in seat or chamber.
- Icing of the muffler and/or air
valve.
- Not sufficient air pressure
- Discharge line is closed
- Suction line closed
- Diaphragm rupture
- Clean or replace the air valve.
Use filtered air!
- Replace air valve
- Replace air valve
- Replace valve balls and/or seats.
- Improve air quality.
- Check air supply system on
blockage and/or leakage.
Or increase air supply.
- Open valve in the discharge line and/or
check on blockage.
- Open valve in the suction line
and/or check on blockage.
- Replace the diaphragms and clean the
pump.
Pumps operates erratically
- Clogged suction line
- Check valves sticky or blocked.
- Diaphragm rupture
- Restricted exhaust
- Air valve is leaking or blocked
- Check suction line
- Clean or replace check valves.
- Replace the diaphragms and clean the
pump.
- Remove restriction (check on icing!) and
when necessary replace
muffler.
- Replace air valve
Air bubbles in fluid
- Suction line is loose
- Diaphragm rupture
- Suction container empty
- Cavitation
- Tighten
- Replace the diaphragms and clean the
pump.
- Fill or replace suction container
- Check suction condition and adapt when
necessary
Fluid in exhaust air
- Diaphragm rupture
- Replace the diaphragms and clean the
pump.
Insufficient discharge pressure
- Not enough air pressure
- Air supply is leaking
- Check valves worn
- Air valve is leaking
- Increase compressed air pressure
or check if no other components are
consuming to much air on the same
compressed air line.
- Check and repair
- Replace check valves
- Replace air valve
Discharge is decreasing
- Other components are
consuming to much air on the
same air supply line.
- Air supply is reduced
- Suction strainer is blocking
- Discharge strainer is blocking
- Medium becomes more viscous
- Muffler blocked
- Increase the volume of air.
- Check air supply system on
blockage and/or leakage.
- Clean suction strainer
- Clean discharge strainer
- Check why and if necessary adjust pump
settings.
- Clean out or replace. Check on
icing!
Pump is running but not
enough suction capability
- Pump is running to fast
- Cavitation
- Suction strainer is blocking
- Suction line closed
- Worn check valves
- Leak in suction line and/or
suction connections
- Start-up pump slow running. Once the
pump is filled with liquid you can run the
pump faster.
- Check suction condition and adapt when
necessary
- Clean suction strainer
- Open valve in the suction line
and/or check on blockage.
- Replace worn parts.
- Repair and make leak tight
