7 Servicing/Maintenance
89 of 100
NOTE
The user is responsible for defining appropriate intervals for checks and
maintenance, depending on the application of the valve.
NOTE
If several valves are serviced at the same time, take appropriate measures to
prevent the dismantled parts from getting mixed up.
The service life can be extended by taking the following measures:
▪
Check the function by opening and closing the valve at least once or twice a year.
▪
Lubricate the moving parts such as stem (200) and gland bolts (not for oxygen
valves) using appropriate lubricants (e.g. lubricants suitable for high
temperatures).
▪
Add or replace packing rings in the gland packing (461) in a timely manner.
▪
Re-tighten or replace the bonnet/cover gasket (411.1) in a timely manner.
Testing overhauled valves
After reassembly and prior to commissioning/start-up, the valves must be subjected
to shell and leak testing to DIN EN 12266-1.
