BIFFI EHO, Installation, Operation And Maintenance Manual

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February 2022
Installation, Operation and Maintenance Manual
VCIOM-15345-EN Rev. 1
6 Installation
Section 2: Installation
2.2 Valve Preparation
2.2.1 Remove Valve Gearing if equipped.
2.2.2 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.
2.2.3 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.
2.2.4 The Biffi EHO Actuator may be mounted to the valve at any time regardless of
whether or not the valve is under pressure.
2.3 Actuator Preparation
2.3.1 Once the Biffi 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.
NOTICE
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 Biffi for further instructions on piping
to elevate the breather. Refer also to standard manual of relevant Biffi Actuator, RPH and
OLGA-H series.
2.3.2 Check that all mounting materials such as fasteners, adapters, brackets etc. are on
hand and ready for use.
2.3.3 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 Operation).
2.3.4 If the unit is equipped with an optional piston style accumulator, it is critical that
the accumulator is precharged with nitrogen prior to operating the equipment.
Refer to Section 2.8 for precharging instructions.
NOTICE
All spring-return Biffi EHO Actuators are supplied with a thermal compensating device
for protection from thermal-expansion of the hydraulic fluid. This thermal compensating
device is preset at the factory and will not need servicing during installation or start-up of
the actuator.