rotork Remote Control Twin Power Manual

Twin Power
Pneumatic Multiturn actuator in Standard and ATEX design

Mounting

The Twin Power actuator works beyond reproach in all
positions. Valves with fluid media should if possible be
fitted in such a way that fluid leakage from the packing
box is not led from the packing box, through the stem, into
the stem nut and the actuator. It is desirable that the valve
stem should be assembled in an upright position. If this
cannot be done care should be taken to tighten the gland
regularly and change the box packing when necessary.
Grease the drive bush carefully and ensure that there is no
radial or axial diffraction between the drive bush and hub.
Check that the numbers of turns not exceed the permitted
turns on the chosen indicating bridge.
The last three numbers in the type denomination inside
the actuator cover, specifies the type of Indicator Bridge.
Indicator Bridge Maximum turns
175 3,5 - 18
100 18 - 32
050 32 - 65
175S 65 - 155
100S 155 - 275
050S 275 - 550
In cases where the Twin Power actuator will be assem-
bled on valves with rising stem and rising hand wheel, the
length of the hub must be minimum the length of the drive
bush axially movement.
WARNING!
Hand wheel must only be mounted during manual
operation.
Some practical advice
Ensure that the 3/8" air connections are positioned so as
to prevent dirt and liquids entering the motor. If necessary,
a short length of pipe should be fitted into each port, with
the end pointing downwards.
WARNING!
Twin Power should be handled and operated by skilled
personnel.
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Assembly example
Valve designed with rising stem and hand wheel.
Instead of the hand wheel a driving bush with keys is fitted
on the stem end. The driving bush rises axially corre-
sponding to the valve rise. In this case an actuator must
be chosen with a hub length corresponding to the rise of
the bush.
Valve with rising stem and non rising hand wheel.
A flange is mounted on the valve, and a driving bush with
keys fitted in the place of the hand wheel for transmission
of the turning movement to the stem unit.
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