ARI Armaturen DP34 EN - Manual (Page 19)

0040504000 1210 Page 19
Operating and installation instructions
Pneumatic actuators - DP32 / DP33 / DP34
8.0 Care and maintenance
Maintenance and maintenance intervals have to be defined by the operator according to
the service conditions.
- For each operating mode, the actuator unit, if need be, should be freed from exterior dirt.
- The actuator unit may not be cleaned with high-pressure equipment or with aggressive
cleaning products, that are a health hazard, or with flammable cleaning products or
solvents.
- After cleaning, for example, an inspection should be carried out checking the sealings of
the actuator unit.
- In order to ensure smooth running, the operation device for the control air should be
furnished with a maintenance unit.
- The rolling diaphragm (pos. 10) and the stem guiding with O-ring-sealing are wearing
parts and must be replaced when necessary (see point 8.1).
- Actuators with manual emergency adjustment:
Lubricate with grease by using lubricating nipple (pos. 54).
8.1 Replacing the rolling diaphragm
- Remove the actuator from the valve, as described in point 7.0, and disassemble.
- Take out the construction units: stem (pos. 1) / diaphragm plate (pos. 11) /
rolling diaphragm (pos. 10) / diaphragm flange (pos. 9).
- Loosen the flange nut (pos. 14).
- Remove the diaphragm flange (pos. 9) .
- Replace the rolling diaphragm (pos. 10) and reassemble.
ATTENTION !
- When replacing the rolling diaphragme, the springs must be changed, too.
Fig. 21: „actuator stem extends by spring force“