VA-C_man rev01-2016_VI_(uk) | 1.02.2017
16
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
