Depa DH40-FA - Troubleshooting Guide; Pump Running Issues; Pumping Capacity Problems; Pump Slowdown and Restart Issues

33
DEPA
®
Air Operated Diaphragm Pumps
Fault Possible cause Remedy
6.0 Troubleshooting
Pump running, no delivery
Insucientpumpingcapacity
Pump slows down, stops,
restarts
Reducedow,stronger
pulsation
Productfrommuer
Air in product
Afterllingtheline
pump standstill
Pump draws in air
Suction valve closed
Suctioncapacityexceeded
Valveballandseatonsuctionsideworn
Muerclogged
Airinletlterclogged
Insucientairsupply
Pipelines blocked
Viscositytoohigh
Icing of the control valve
Valveballonsuctionside
blocked
Diaphragm cracked
Diaphragm cracked
Air pressure too low
To high viscosity
Viscositytoohig
Seal the suction line
Open valves
Change the arrangement
Replace seats and balls
Clean or renew
Clean or renew
Check supply line
Clean
Change conditions
Use dry air
Supply the air with anti-freeze
Useaheavy-dutymuer
Ensure movability of valve ball
Replace diaphragm
Replace diaphragm
Increase air pressure