ARI Armaturen DP34 Tridem EN - Manual (Page 12)

Page 12 0040504001 2010
Operating and installation instructions
Pneumatic actuators - DP34T / DP34Tri
5.4 Control pressure connection
The control pressure-connecting line is to be connected to the actuators pipe installation.
The threaded joint connection is: DP34T = G 3/8“
DP34Tri = G 1/2“
5.5 Assembling the valve, operating mode
„actuator stem extends by spring force“
Straightway valves will be closed by spring force on air failure (Fig. 8).
Flow B - AB of 3-way mixing valves will be closed by spring force on air failure (Fig. 9).
- 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 terminal position is the path B-AB.
- Loosen cylinder-screws.
- Remove securing flange and threaded sleeve from the actuator connection.
- Screw the locknut onto the valve stem.
- Place the securing flange over the valve stem and screw the threaded sleeve 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.
- 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.
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 back he threaded bushing on the valve stem, until the top corner of the coupling
flange appears in the groove and fits tightly.
Simultaneously, the plug on the valve seat must be tight fitting.
- Attention must be paid, that the valve stem is in deep enough into the threadbush.
If need be, screw back the coupling flange.
- Fasten the safety flange with cylinder-screws onto the coupling flange.
- Check to see if at the starting point of the spring range, the plug lifts from the seat.
- After a test run adjust the position indicator (adjusting ring with set screw) 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).
ATTENTION !
- The actuator diaphragm is only allowed to be admitted control air on the
opposite side of the springs (pressure chamber).
The component hole on the spring side must always be open.
ATTENTION !
- During assembly jobs, the plug is not allowed to be turned on the valve seat
while under contact pressure