DVZ - SERVICES GmbH DVZ - SKA - „BIOMASTER“ - MS Engineering

DVZ-ALPB
Maintenance
WARNING
Metering pumps and their peripheral equipment may only be
serviced by trained and authorised personnel!
Service intervals: every quarter of a year!
Please note:
Service internval: every quater of a year!
Shorter intervals for heavy duty operation (e.g continuous
operation)!
The maintenance of the DVZ metering pumps is limited to
checking
The liquid end screws (fitting tightly, 4.5 - 5 Nm)
The discharge lines (fitting tightly)
The head and suction valves (fitting tightly)
The bleed valve for the PP version (fitting tightly)
The drain bore behind the liquid end side (dampness can indicate
a
diaphragm rupture)
Fault Possible cause
No metering pump intake (during initial
operation)
No metering although drive is running (after
longer period of operation)
Metered liquid emerges from leakage
opening of delivery unit
Loss of metering capacity (after longer
period of operation)
Troubleshooting
Suction head too high
Backpressure in metering line (delivery
side)
Stroke setting 0 %
Intake tank empty
Issue: 10.06.2009 Instruction Manual DVZ-SKA-“BIOMASTER“ Page 26 of 37
EOISKA-SD2n
Corrective measures
Install pump closer to intake tank
Eliminate backpressure (e.g. via bypass
line)
Increase stroke length (100 %)
Top up medium and restart
Gas cushion in intake line and liquid end Bleed intake line, check for leaks and
restart
Diaphragm defective Replace diaphragm
Wearing parts in valves defective
Deposits in valves
DOSIERPUMPE / metering pump
Replace wearing parts
Clean or replace valve parts