16
5 FT 70 en
6.4
Installing the B1J series actuator
Spring-return actuators are used in applications where
valve opening or closing movement is needed in case the
air supply is interrupted. The B1J type is used for spring-to-
close operation; the spring pushes the piston towards the
cylinder end, the extreme outward position. In turn, the
B1JA type is used for spring-to-open operation; the spring
pushes the piston towards the housing.
Spring-return actuators are installed in a manner similar to
B1C-series actuators, taking into account the following.
6.4.1
B1J type
Install the actuator so that the piston is in the
extreme outward position. The cylinder must not be
pressurized and air supply connections must be
open. The valve must be in the closed position.
6.4.2
B1JA type
Install the actuator so that the piston is in the cylin-
der end position at housing side. The cylinder must
not be pressurized and air supply connections must
be open. The valve must be in the open position.
The rest of the installation procedure is the same as in Sec-
tion 6.3.
6.5
Detaching B series actuators
Disconnect the actuator from its power source;
detach the air supply pipe and control signal cables
or pipes from their connectors.
Unscrew the bracket screws.
Detach the actuator using a suitable extractor, see
Fig. 23. The tool can be ordered from the manufac-
turer.
Remove the bracket and coupling, if any.
6.6
Installing EC and EJ actuators
The actuator is attached to a valve via an ISO 5211 standard
mounting interface. The actuator shaft is adapted to the
valve shaft with a separate bushing. The bushing (II + II) is a
two-piece cone-shaped bushing, which is tightened firmly
with a tightening screw (I) around the valve shaft.
The bushing and the tightening screw are inserted
to actuator drive shaft according to Fig. 24. Cylindri-
cal pins (III) are inserted in the bushing slots, and
these must be directed into the corresponding slots
in the actuator during tightening. Before the installa-
tion of the bushing and the tightening screw, impu-
rities such as old threadlocking material have to be
removed from the threads of the tightening screw,
and Loctite 225 or similar threadlock have to be care-
fully applied to the threads, as shown in Fig. 24. The
tightening screw can be turned from inside the actu-
ator shaft using a suitable hex key, Fig. 25.
Prior to installation, the correct keyway position of
the valve has to be checked. The bushing has four
keyways, two of which are intended for valves with
DIN key and two for valve shafts with ANSI key. The
DIN keyway is located in the split between the bush-
Table 6
Supply pressures for adjusting the closed limit,
B1C and B1J actuators
Valve size
Actuator
Supply pressure,
bar
DN25
B1C 6
0.8
DN40
6
0.9
DN50
6
1.6
9
0.8
DN80
9
1.6
11
0.9
DN100
11
2.2
13
1.0
DN150
13
1.3
17
0.7
DN200
17
1.3
20
1.1
DN250
20
1.3
25
0.7
DN25
B1J 6
0.9
DN40
B1J 6
0.9
DN50
B1J 6
0.5
DN25
B1J 8
1.2
DN40
8
1.1
DN50
8
1.0
DN80
10
0.9
12
1.2
DN100
12
0.8
16
1.1
DN150
16
1.0
20
1.2
DN200
20
1.0
DN250
25
1.1
DN25
B1JA 8
2.7
DN40
8
2.8
DN50
8
2.9
DN80
10
2.9
12
2.8
DN100
12
3.1
DN150
16
2.9
20
2.7
DN200
20
2.8
DN250
25
2.7
Note: This table is not applicable to low Cv valves
Fig. 23
Detaching an B series actuator
CAUTION:
Beware of the segment movement!
