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6.Maintenance
2021/12
6.
Maintenance
6.1.
GENERAL
This valve, just like any other machine, requires maintenance. The instructions contained in this manual cover the
identification and replacement of spare parts. The instructions have been prepared for maintenance personnel and for
those responsible for the supply of spare parts.
Please carefully read Chapter 8.
All replaced material should be duly disposed of/recycled according to the directives in effect
in the area.
Assembly and disassembly of the valves must only be carried out by qualified staff.
Before starting on maintenance work, ensure that the pipework is not pressurised.
6.2.
MAINTENANCE
The following is recommended for appropriate maintenance:
•
Regular inspection of the valve and its components.
•
Keep a record of the operation of each valve, noting any incidents.
•
Always have spare seals in stock.
During maintenance, pay particular attention to the danger signs indicated in this manual.
The valve and pipes should not be pressurised during maintenance.
The valve should not be hot during maintenance. Danger of burns!
6.2.1.
Diaphragm maintenance.
REPLACEMENT OF DIAPHRAGMS
Preventive maintenance
•
Media at temperatures < 60ºC replace after twelve (12) months.
•
Media at temperatures of 60ºC to 120ºC replace after three (3)
months.
•
Exposure to steam > 100° C, but maximum 140° C The diaphragm
should be inspected after approx. 50 hours exposure, e.g. after
100 sterilisation of 30 minutes.
•
The service life to the valve diaphragm depends on its working
conditions. Decisive factors with regard to the service life are
temperature and the type of process fluid. Therefore maintenance
intervals can only be determined by the plant user, since they
depend on the operating conditions.
Maintenance after a leak
•
Replace at the end of the process.
Scheduled maintenance
•
Regularly check that there are no leaks and that the valve is
operating smoothly.
•
Keep a record of the valve.
•
Use statistics to plan inspections.
Lubrication
•
During assembly, apply lubricants compatible with the diaphragm
material. See the following table.
SEAL COMPONENT
LUBRICANT
Class NLGI DIN
51818
VMQ/ FPM
Klübersynth UH 1 64-2403
3
EPDM/ FPM
PARALIQ GTE 703
3
6.2.2.
Storage
