ARI Armaturen DP34 EN - Manual (Page 15)

0040504000 1210 Page 15
Operating and installation instructions
Pneumatic actuators - DP32 / DP33 / DP34
5.4 Control pressure connection
The control pressure-connecting line is to be hooked up to the diaphragm base (pos. 7)
during the „Spring closes“ operating mode and to the diaphragm cover (pos. 18) during the
„actuator stem retracts by spring force“ operating mode.
The threaded joint connection is the following. By actuators DP 32 and DP 33: G1/4“ and by
the actuator DP 34: G3/8“.
5.5 Assembling the valve, operating mode „actuator stem extends by
spring force“
Straight through valves will be closed by spring force on air failure (Fig. 16).
Flow B - AB of 3-way mixing valves will be closed by spring force on air failure (Fig. 17).
- In the case that the valve and actuator have been delivered separately, the plug with stem
are to be set into the terminal position by means of pressing „ CLOSE. “
- In the case of the three-way mixing valves, the end position is the path B-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. 2, Fig. 6 and
Fig. 10.
- Connect the control pressure line to the connection of the diaphragm base (pos. 7) and
pressure measuring equipment.
- Drive the actuator with control pressure in midtravel (in the middle of the spring range).
- Place the actuator onto the valve-traverse and fasten by means of hexagon nuts.
ATTENTION !
- The actuator diaphragm is only allowed to be admitted control air on the
opposite side of the springs (pressure chamber).
The component hole (ventilation) on the spring side must always be open.
ATTENION !
- During assembly jobs, the plug is not allowed to be turned on the valve seat
while under contact pressure.