9
6
MAINTENANCE
6.1 Schedule
The sleeve is the only part of the valve which is in contact with the medium flowing in
the pipeline. With regular sleeve changing, the likelihood of malfunctions in the process
decreases. Wear resistance of the sleeve depends on the circumstances of the process
and may vary a lot.
If there is a flow through closed valve or leakage through bushings (PVE) or through
damaged sleeve (PV), change the sleeve immediately.
WARNING
PVE: In case of a sleeve failure, slight leakage can occur
through bushings.
PV: In case of a sleeve breakage, the flowing liquid will
leak into the environment.
6.2 Changing the valve sleeve
WARNING
Control the valve functions (see 2.3) and follow the
instructions for adjusting of valve (6.3) to prevent
accidents and to ensure the correct operation of the
valve.
6.2.1
Changing the valve sleeve in open model valve (PV)
Fig. 8.
See appendix A. Open the valve and detach it from
the pipeline. If the valve is equipped with opening
tags, loosen the fixing screws (8 pcs) at the pinch
bars and pull out the opening tags (Fig. 8).
Remove the broken sleeve by bending the rubber
flange of the sleeve and by wrenching it e.g. with a
pry bar / bending iron.
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