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Actuator assembly tight-
ening torques
Notes on filling the relief
housing with wire springs
in versions with an ex-
pander
Cleaning
Positioning the actuator
assembly as necessary for
maintenance
HON 512 with HON 650 pilot user manual
The tightening torques specified in the table apply to the maintenance instructions for the
actuator assembly. When screwing the body sections in step 27, the tightening torques must
be increased gradually. Start by tightening the screws with a third of the tightening torque,
then with two thirds, and, finally, with the full tightening torque in a criss-cross sequence.
Section
Tightening torque by DN nominal sizes in Nm (ft lbs)
Step
150/
150/
150
300
Maintaining
the actuator
assembly
17
Maintaining
500 (370)
the actuator
assembly
27
In versions with an expander, the relief housing must be refilled with the wire springs after
maintenance as indicated in the maintenance instructions for
DN 25 – 100 actuator assemblies in the Maintaining the outlet body section. When the relief
housing is filled with wire springs, the wire springs must protrude upwards 10 mm beyond
the outlet section's screw-on surface.
Observe the following cleaning instructions:
▪ Before assembly, all parts must be cleaned in order to remove any foreign particles
(swarf) and soiling.
▪ If screws, bolts, or washers are replaced with identical new parts, any oil on these new
parts must first be removed.
Proceed as follows:
Figure
150/
200/
200/
200/
400
200
400
500
15 (12)
Step
Description
1
Set down the actuator assembly on the
inlet body (2) in such a way that the
position indicator (1) points upwards. Take
the assembly's high center of gravity into
account. Secure the assembly's position.
Maintenance
250/
250/
250/
250
500
600
1150 (850)
84
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