Valve Preparation; Actuator Preparation - Emerson Bettis EHO Installation, Operation And Maintenance Manual

Section 2: Installation
December 2022
2.2

Valve Preparation

2.2.1
2.2.2
2.2.3
2.2.4
2.3

Actuator Preparation

2.3.1
NOTE:
At this point, check to see that when the actuator is mounted to the valve and in its final
orientation, the outboard end of the power cylinder positioned below the Hydraulic
Reservoir Breather. If this is not possible, contact Bettis for further instructions on piping to
elevate the breather. See Vertical Mounted Actuator, step 2.4.4.
2.3.2
2.3.3
2.3.4
NOTE:
Failure to pre-charge the accummulator may cause the actuator not to function properly.
CAUTION
!
Be aware, while preparing to and lifting the actuator, the Thermal Compensating
Accumulator contains high-pressure nitrogen. Use care not to damage the accumulator or
its attachments.
4
Remove Valve Gearing if so equipped.
If valve is equipped with stops, remove valve stem extension housing. Examine
the valve stops to ensure no foreign material is present that would restrict normal
travel of the valve. Some valves are equipped with inspection ports in the valve
housing for ease in examining the stops.
Check alignment of stem key slot to the position of the valve. Normally with the
valve in the open position, the key slot is in line with the run of the pipeline. With
the valve in the closed position, the key slot should be 90° to the run of the valve.
The EHO Actuator may be mounted to the valve at any time regardless of whether
or not the valve is under pressure.
Once the EHO Actuator is uncrated and cleaned for installation, check to ensure
there will be no interference with piping or other structure when the actuator is
properly mounted to the valve.
Check that all mounting materials such as fasteners, adaptors, brackets etc. are on
hand and ready for use.
Check the actuator and valve to see that they are in the same relative position,
that is either open or closed. If the actuator has to be moved, use the handpump
provided. For handpump operation, remove the plug in the reservoir and install
the breather (refer to Section 4.4, Handpump).
All spring-return EHO Actuators are supplied with a small accumulator for protection
from thermal-expansion of the hydraulic fluid. This accumulator will be tagged and
may need pre-charged prior to operation. Check the tag prior to operation.
Installation, Operation and Maintenance Manual
VA001-507-32 Rev. 1
Installation