5.1 IQT
Actuators
The IQT range of actuators are suitable
for part turn applications requiring up
to 60 starts per hour.
5.2 IQTM
Actuators
The IQTM range of actuators are
suitable for modulating control duty of
up to 1200 starts per hour in
accordance with IEC 34-1 to S4 50%.
Commissioning of IQTM range
actuators is identical to the standard
IQT (refer to Sections 7, 8 and 9).
5.3 IQTF
Actuators
The IQTF range of actuators are
suitable for part-turn and multi-turn,
non-thrust applications requiring low
speed and low operating turns.
Commissioning of IQTF range actuators
is similar to the standard IQT (refer to
Sections 7, 8 and 9).
5.4 Lifting the Actuator
(Refer to Weights and Measures page
71 for actuator weight.)
Ensure the valve is secure before fitting
the actuator, as the combination may
be top heavy and therefore unstable.
If it is necessary to lift the actuator
using mechanical lifting equipment
certified slings should be attached as
indicated in Figure 5. At all times
trained and experienced personnel
should ensure safe lifting, particularly
when mounting actuators.
A suitable mounting flange conforming
to ISO 5210 or USA Standard MSS
SP101 must be fitted to the valve.
Actuator to valve fixing must conform
to; Material Specification ISO Class 8.8,
yield strength 628 N/sq mm.
WARNING:
Do not lift the actuator and valve
combination via the actuator. Always
lift the valve/actuator assembly via the
valve.
Fig. 5
WARNING:
The actuator should be fully supported
until full valve stem engagement is
achieved and the actuator is secured to
the valve flange.
Fig. 5.1
5.5 Securing Actuator to Valve
Before engagement ensure that the
actuator and valve are in the same
position (i.e. closed) and the drive bush-
machining matches the stem position.
Actuator position can be determined
using the display (refer to section 3.3
page 4) and if necessary can be moved
using the handwheel (refer to section
3.1 page 3). It may be necessary to
adjust the stop bolts to enable
sufficient travel. Refer to section 5.6
page 9.
8
Mounting the Actuator
5
