Alfa Laval Micro
Installation, service and operating instruction
63
Change the differential pressure control valve
20.8
Maintenance and repairs must be carried out by an authorized service technician.
Before starting out repairs always close the primary supply and return shutoff valves and drain
the system with the draining valves.
After finishing repair; open the shutoff valves. Start with primary supply and then the return lines,
in order to avoid pollutions in the system. Open up the valves slowly to avoid pressure surges.
1. Use a spanner to remove the differential pressure control valve.
Note the position of the P/T plugs on the valve.
2. Mount a new valve; and take especially care to the P/T plugs
position.
Change the flow switch 20.9
Maintenance and repairs must be carried out by an authorized service technician.
Before starting out repairs always close the primary supply and return shutoff valves and drain
the system with the draining valves.
After finishing repair; open the shutoff valves. Start with primary supply and then the return lines,
in order to avoid pollutions in the system. Open up the valves slowly to avoid pressure surges.
1. Disconnect the substation electrical power supply cable.
Disconnect the electrical plug to the flow switch.
2. Loosen the nut that holds the flow switch.
3. Carefully mount the new flow switch.
Note: Hold the flow switch in position when tightening the nut by
hand. The flow switch breaks if it is turned around with the nut.
Connect the power plug and the substation electrical power supply.
4. Connect the power plug and the substation electrical power
supply.
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