ARI Armaturen DP34 EN - Manual (Page 16)

Page 16 0040504000 1210
Operating and installation instructions
Pneumatic actuators - DP32 / DP33 / DP34
5.6 Setting the starting point, operating mode „actuator stem extends 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 into the coupling flange.
Simultaneously, the plug on the valve seat must also be tight.
- 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 if at the starting point of the spring range (of the plug), lifts from the seat.
- After a test run adjust the position indicator to the terminal positions and screw both
locking nuts tightly (at ca. 50% lifting positioning).
(Do not turn the plug on the valve seat while under contact pressure).
5.7 Assembling the valve, operating mode „actuator stem retracts by
spring force“
Straight through valves will be opened by spring force on air failure (Fig. 18).
Flow B - AB of 3-way mixing valves will be opened by spring force on air failure (Fig. 19).
- In case the valve and actuator have been delivered separately, the plug with stem are to
be set into the terminal position by means of pressing „OPEN.“
- In the case of the three-way mixing valves, the terminal position is the horizontal
throughway A-AB.
- DP32, DP33:
Unscrew set screw and coupling with thread bush from the securing flange.
DP34:
Loosen cylinder screws.
Remove the lock washer, securing flange and thread bush from the actuator connection.
- Screw the lock nut onto the valve stem.
- DP32, DP33:
Place the coupling over the valve stem and screw the thread bush onto the valve stem.
DP34:
Place the lock washer and securing flange over the valve stem and screw the thread bush
onto the valve stem.
- Check that the actuator has been set into the correct operating mode.
- Actuators with manual emergency adjustment:
Check the position of the manual emergency adjustment, please refer to Fig. 4, Fig. 8 and
Fig. 12.
- Connect the control pressure line to the diaphragm cover connection (pos. 18) and
pressure measuring equipment.
- Drive the actuator with control pressure in midtravel (in the middle of the spring range).
- Place onto the valve traverse and fasten by means of hexagon nuts.
ATTENION !
- During assembly jobs, the plug is not allowed to be turned on the valve seat
while under contact pressure.