3 R 71 EN - Issue 9/2020
11
6 INSTALLING THE
ACTUATORS
6.1 General
Different Neles actuators can be mounted using suitable brackets
and couplings. The valve can be operated, for example, by actuators
of the B1 or Quadra-Powr series.
6.2 Installing B1C actuators
•
Drive the actuator piston to the extreme outward position and
turn the valve into the closed position, see Fig. 9.
•
Clean the shaft bore and file off any burrs. Lubricate the shaft
bore.
•
If a coupling is needed between the actuator shaft bore and the
valve shaft, lubricate the coupling and install it in the actuator.
•
Fasten the bracket loosely to the valve using lubricated screws.
•
Push the actuator carefully onto the valve shaft. Avoid forcing it,
since this may damage the segment and seat. We recommend
mounting the actuator so that the cylinder is pointing upwards.
•
Align the actuator as accurately as possible using the valve as a
guide. Lubricate the mounting screws. Install the washers and
tighten all screws, see Table 4.
•
Adjust the segment open and closed positions (limits to piston
movement) by means of the actuator stop screws, see Fig. 24.
The correct opening angle is 90°, for the R2_S valve 70°. The
accurate position can be seen in the flow port. Check that the yel-
low arrow indicates the position of the segment.
Keep your fingers out of the flow port!
There is no need to adjust the stop screw if the actuator is re-installed
in the same valve. Drive the actuator piston to the housing end (open
position).Turn the actuator by hand until the valve is in the open
position (unless it is already open). Fasten the actuator in this position.
The actuator may be installed in another position with respect to the
valve by selecting another keyway in the actuator, see Fig. 28.
•
Check the tightness of the stop screw at the end of the cylinder
during cylinder operation. The threads must be sealed using an
appropriate non-hardening sealant, e.g. Loctite 225.
•
Check that the actuator is functioning correctly. Check the seg-
ment flow bore position and the actuator movement relative to
the valve (clockwise: close, counterclockwise: open) after install-
ing the actuator. The valve should be closed when the piston is in
the extreme outward position.
•
Check that the yellow arrow indicates the position of the seg-
ment. If necessary, change the position of the arrow.
6.3 Installing B1J actuators
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 is
between the piston and the cylinder end and pushes the piston
towards the housing.
Spring-return actuators are installed in a manner similar to B1C
series actuators, taking into account the following.
Type B1J
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,
see Fig. 9.
Type B1JA
Install the actuator so that the piston is in the cylinder-end position at
housing side. The cylinder must not be pressurized and the air supply
connection must be open. The valve must be in the open position,
see Fig. 9.
The rest of the installation procedure is the same as for B1C
actuators.
CAUTION:
Beware of the segment movement!
Fig. 27
Open and closed positions of a B1 actuator
Stop screw for the
OPEN position
Stop screw for the
CLOSED position
Fig. 28
Changing the actuator position