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Operating manual
Non-Return Valve FLOWmag
12020 / 12021
BA_012020.01_EN
Albert Handtmann Armaturenfabrik GmbH & Co. KG
2015-09-07
14 / 14
6.
Servicing
6.1 Maintenance Instructions
Caution – functional impairment or material damage!
Inspection and maintenance intervals:
•
Visual inspections must be carried out continuously every 4 weeks.
•
To ensure that the valve is ready for operation and functionally reliable, it should be
checked every year within the scope of the general internal maintenance procedure.
>> Maintenance intervals must be set by the user
•
After maintenance, always remove protective devices and reconnect the feed and drain
lines to the valve.
•
Ensure that a function test is always performed on the valve
following maintenance work.
6.2 Troubleshooting
Malfunction
Possible causes
Measures
Leak
(external)
•
O-ring seals between
flange and housing damaged
•
Screws have come loose
•
Process pressure too high
•
Replace seals
•
Test tightening torque
•
Check pressure
Leak/backflow
(internal)
•
O-ring seal between taper and shutter
damaged
•
Seal area damaged
•
Shutter blocked
•
Replace seals
•
Check seating area and taper for
mechanical damage
•
Manual functional check, remove
shutter
Noise generation
•
Uneven flow/cavitation
•
Check process conditions,
change installation position
6.3
Spare Parts
Seal / Position
DN 10
DN 15
DN 20
DN 25
DN 40
Seal set for: 012020.
00010
00015
00020
00025
00040
Seal / Position
DN 50
DN 65
DN 80
DN 100
Seal set for: 012021.
00050
00065
00080
00100
Seal replacement - please note the following points:
•
Use a suitable tool (dig hook) to remove the seals
•
The gasket grooves should be cleaned thoroughly before installing the new seals.
•
Slightly grease the seals (only use grease approved for the field of food processing)
•
Insert seals evenly into the gasket grooves