Flowserve LHS Hydraulic Heavy-Duty Actuator Series - Manual (Page 9)

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LHS Hydraulic Heavy-Duty Actuator Series FCD LFENIM0003-00-AQ 7/14
2.2 Connection With Valve and Mounting Kit
The LHS actuator is usually supplied with the spool piece already assembled. To assemble the actuator onto the
valve, perform the following steps:
2.2.1 Check the mounting surfaces, the stem adaptor and the spool piece to
assure the proper fit. Clean the flange of the valve and spool piece to
remove oils and greases since the torque is transmitted by friction. Also
remove any rust that may have occurred during the storage.
2.2.2 Secure the valve in the closed/open position, if possible, with the stem
vertical. Lubricate the valve stem in order to ease the assembly. Place the
stem adaptor on the valve stem.
2.2.3 Lift the actuator by specific lift points (eyebolts), using a proper lifting
system. Position the actuator over the valve and lower to engage the
stem adaptor to the actuator bore. Continue to lower until the spool piece
sits on valve mounting surface. This coupling has to take place without
force and only with the weight of the actuator. The mounting bolts (or
studs) of the valve should easily fit into the bolt holes of the spool piece
without any binding. If needed, turn or stroke the actuator a few degrees
and/or adjust the actuator travel-stops.
2.2.4 The mounting nuts (or bolts) connecting the base of the spool piece to the
valve flange must be evenly tightened according to specific tables, available
upon request to Flowserve After Sales Department.
NOTE: In some cases, the coupling between valve and actuator can be direct,
without the need of a spool piece. In other cases, Flowserve can provide an
intermediate spool piece or an adapter flange (fitted under the actuator
housing) and a special bushing to be inserted into the yoke bore.
a WARNING: In case of spool piece (or adapter flange) installation by the client, it is mandatory to refer to the
“Mounting Interface Dimensions” paragraph of Technical Bulletin No. LFENTB0003, or to follow more specific
instructions included in the job documentation supplied along with the actuator. These assembling instructions
include details of prescribed stud bolts and their maximum allowable threaded length, in addition to the Loctite
type to be used for a perfect sealing of Scotch yoke housing.
a CAUTION: The actuator lifting and handling should be made by qualified staff and in compliance with the laws and
provisions in force