9
Malfunction Possible Reason Solutions/Remarks
pumps operates, however suction
capacity insufficient
pump operates too fast
operation beyond physical limits
cavitation
operation beyond pump capacity
air cushion within suction/discharge
line
dry suction against discharge
pressure
valve filter within suction line closed
valve filter within discharge line
closed
container with liquid empty
vacuum inside the container
wear of the check valves
suction line leaky
suction line blocked
air pressure cushion at discharge
check valve blocked
start more slowly
adjust installation
check, cool down
adjust installation resp. install
bigger pump
bleed the line
wet pump, start without pressure
open valve/clean filter
open valve/clean filter
fill/new container
bleed container
replace valves
seal suction line
clean suction line
bleed discharge line
clean/replace valve
insufficient suction capacity after
pump repair
connections tighten incompletely
check valves inserted falsely
tighten/seal connections
correct positioning of check valves
diaphragm overstrained pressure within the plant/system
inadmissible vacuum
icing
ensure that pressure is only
developed by the pump itself,
check plant/valves,
replace diaphragms
check suction line, open valve
improve air processing
leaking between housing parts housing bolts loosened
O-rings sleeve damaged
diaphragms attacked chemically
diaphragms overstrained
tension installation/pipework
tighten bolts, check pump
replace O-rings
replace diaphragms
replace diaphragms
loosen, eliminate tension,
use of a compensator
muffler grey driving air too humid, icing improve quality of driving air
muffler black soiled, oily air improve quality of driving air,
install sensitive filter in suction line
pump is connected to air but does
not operate
air control system blocked
bulk particles/dirt
chemical influence (O-rings
swollen)
valve closed in discharge line
clean/replace air control system
clean pump, replace necessary
parts, improve air quality
check, replace damaged parts
open valve
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