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Specifications subject to change without notice
Edition: August 2017
Maintenance EB 31a-01_EN
5.5
Mounting the actuator onto valves:
Fig. 11 - Mounting the actuator onto valves
Note:
Before mounting the actuator onto a valve,
ensure that the actuator turns in the required
direction of rotation and that the valve and actuator
are correctly aligned with each other.
Caution:
When mounting a single-acting actuator
(with spring) with a defined fail-safe position,
ensure upon pneumatic or electric power failure
that the direction of rotation is according to your application.
(clockwise to close).
Mount the actuator ( 3 ) onto the valve ( 5 ). The actuator
must be in the initial position (CLOSED position).
There are two different mounting versions:
•
Direct mounting:
Insert either the square drive, flat head drive or key drive
of the valve shaft directly into the actuator shaft. Fasten
them using the ISO flange onto the actuator. See Table 2
for max. tightening torque.
•
Mounting using a bracket:
Mount the bracket (6) onto the valve (5) and place the
coupling (7) onto the actuator shaft.
Note:
Make sure that the position indicator of the
coupling corresponds with the switching position of
the valve.
Place the actuator onto the shaft and fasten the unit. See
Table 2 for max. tightening torque.
5.6
Changing the direction of action/fail-safe
position
Note:
For the exact procedure for disassembly and
assembly, refer to section 6 (maintenance and
assembly instructions).
•
Move the actuator to the fail-safe position to release the
spring compression.
•
Remove the screws ( 24 ) (see Fig. 15).
•
Pull the position indicator ( 19 ) off the end of the shaft. If
necessary, use a screwdriver to lever it off.
•
Remove both adjusting screws ( 2 ) with washers ( 4 ) and
lock nuts ( 3 ) (see Fig. 16).
•
Remove the O-ring ( 11 ).
•
Unscrew the screws ( 13 ) of the end caps (see Fig. 17).
•
Remove end caps ( 22 und 23 ) from the housing.
•
For single-acting actuators, remove the spring cartridges
( 17 ).
•
Remove the gaskets ( 14 ) of the end caps.
•
Clamp the housing ( 29 ) in a vise or similar. Turn the
shaft ( 30 ) until the pistons ( 25 ) are released
(see Fig. 18).
•
Turn both pistons ( 25 ) in axial direction by 180° and
reassemble.
•
Press both pistons ( 25 ) simultaneously into the housing
( 29 ) until they engage and turn the housing until the
travel end position is reached.
•
Check that the pistons are in the end position. Turn the
shaft 4° over the center line (0°) (see Fig. 25).
•
For single-acting actuators, insert the spring cartridges
into the end caps (see Fig. 27).
•
Insert the gasket ( 14 ) into the groove of both end caps.
•
Mount the end caps on the housing ( 29 ).
•
Tighten the screws ( 13 ) by hand. Observe the tightening
sequence (see Fig. 28).
•
Insert the adjusting screws ( 2 ), lock nuts ( 3 ), washers
( 4 ), and O-rings ( 11 ).
•
Screw the adjusting screws ( 2 ) into the housing.
•
Observe the end position setting.
•
Place the position indicator ( 19 ) onto the shaft. Make
sure that it is in the correct position (see Fig. 30).
•
Tighten screw ( 24 ).
5.7
Alternative mounting options:
•
Alternative mounting options
(in clockwise direction to open)
