ARI Armaturen DP34 EN - Manual (Page 17)

0040504000 1210 Page 17
Operating and installation instructions
Pneumatic actuators - DP32 / DP33 / DP34
5.8 Setting the starting point, operating mode „actuator stem retracts by
spring force“
- Set the actuator unit to the desired starting point of the spring range.
- Screw the thread bush on the valve stem respectively screw the coupling flange on the
actuator stem until the thread bush is fastened onto the coupling flange.
Simultaneously, the plug must be set in the OPEN position.
(The three-way valves must be adjacent to the plug in the casing seat.)
- Observe, that the valve stem is deep enough into the thread bush, respectively the
actuator stem is deep enough into the coupling flange.
If necessary, screw back the coupling flange or the thread bush.
- DP32, DP33:
Screw coupling into the securing flange and tighten. Lock with set screw.
DP34:
Fasten the safety flange and lock washer with cylinder screws onto the coupling flange.
- Check to see that the starting point of the spring range (of the plug) lifts out of the terminal
position and after obtaining the control pressure-target value, that the valve motion drives
through and is resting on the valve seat.
- After a test run, adjust the position indicator to the terminal positions and screw both
locking nuts tightly. (at a ca. 50% lifting positioning)
(Do not turn the plug on the valve seat while under contact pressure.)
6.0 Putting the valve into operation
Before putting a new plant into operation make sure that:
- Attention paid that the control pressure connection has been properly installed
(please see point 5.4).
- Check to make sure that all mobile, exterior parts can move freely.
- All applicable, current information given in the operating manuals for additional parts (for
ex. positioner, filter reduction station, interlocking relay, ...) have been observed.
- In case of improper functioning, all assembly and setting jobs must be checked over and
corrected, is necessary.
ATTENTION !
Before putting a new plant into operation or restarting a plant after repairs or
modification, always make sure that:
- All works has been completed!
- The valve is in the correct position for its function.
- Safety devices have been attached.