10 6 BC 71 en
7 ORDERING SPARE PARTS
When ordering spare parts, always include the following
information:
type code, sales order number, serial number
number of the parts list, part number, name of the
part and quantity required
This information can be found from the identification plate
or documents.
NOTE:
Use only original spare parts. This ensures proper functioning
of the actuator.
Table 6 Possible malfunctions
Symptom Possible cause Action
Irregular or slow operation Low supply pressure Make sure that supply pressure complies with minimum
torque required by valve.
Check that supply air pipes are large enough.
Positioner malfunction Check the operation of the positioner.
Valve malfunction Check that valve functions properly without actuator.
Wrong size actuator Contact the manufacturer for checking the size.
Leak in piston or piston rod seal Replace seals. See Section 4.1.
Cylinder damaged by impurities Note installation position recommendation.
Cylinder damage always requires replacement.
Worn-out actuator bearings Check condition of bearings in accordance with Section 4.2.
Replace the bearings if necessary. If the frequency of
operation is high, the bearings and piston seals should be
replaced at regular intervals, max. of 500 000 operations..
Linkage rusted in difficult damp conditions Clean the linkage and replace the bearings. Lubricate the
housing regularly and apply grease as in Section 4 .1. If
water collects in the housing, bore a hole in the lower part
of the housing (ø5 mm).
The fastening screw in the bearing unit is loose Tighten screw. Lock with Loctite 225 or equal liquid glue.
Play in the joint between actuator and valve Replace necessary parts.
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