9
5.1 Lifting
WARNING:
Refer to weights and measures
from job specific EH information for
actuator weight.
Ensure the valve is secure before fitting
the actuator as the combination may be
top heavy and therefore unstable.
In no circumstances should hydraulic
piping or electrical cabling be used for
lifting purposes.
If it is necessary to lift the actuator
using mechanical lifting equipment,
certified slings should be attached.
At all times trained and experienced
personnel should ensure safe lifting,
particularly when mounting actuators.
WARNING:
The actuator should
be fully supported until complete
valve shaft engagement is achieved
and the actuator is secured to the
valve mounting flange.
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.
Each assembly must be assessed on an
individual basis for safe lifting.
5.2 Mounting Orientation
Refer to order specific installation
drawing for proper mounting
orientation.
5.3 Fitting to Valve
Refer to order specific installation
drawing for proper fitup and mounting
pattern to valve.
5.4 Mechanical Travel
Adjustment
When the actuator has been bolted
to the valve flange or adaptor and
keys inserted; the position of the stop
bolts should be checked to ensure full
opening and closing of the valve.
If the preset end positions are not
suitable, the stop bolts may be adjusted
by first loosening the jam nut and
screwing the bolts in or out until the
desired position is obtained. Stroke the
yoke away from the stop bolt when
adjusting then return to check position.
When the correct position is obtained,
re-tighten the jam nut.
Certain valves incorporate their own
stops. In these cases, it is recommended
that the actuator stop bolt positions
coincide with the valve stop positions.
5.5 Hydraulic Fluid
EH actuators are supplied without
hydraulic fluid and must be filled prior
to operation. See Section 10.1 for the
oil specification.
WARNING:
If the actuator is fitted with an
accumulator it must be drained to
the reservoir before adding oil.
With the spring, or for double-acting
actuators the piston, fully extended,
fill the reservoir to approximately 50
mm (2 inches) below the top. Stroke
the actuator two times and re-check
the reservoir level. Add additional oil as
required. Refer to Section 10.1 for the
oil specification.
5.6 Power Accumulators
Some EH Range actuator configurations
are equipped with hydraulic
accumulators to store energy for
stroking the actuator.
Accumulators must be pre-charged with
dry nitrogen prior to operation. See
Appendix A.
5
Mounting the Actuator
