HLA
– Double acting- hydraulic linear actuator
Use and maintenance manual
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Pag. 11
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3) . Screw the actuator coupling joint onto the valve by rotating the
actuator, or screw down the valve stem stroke-ring with Red
Loctite 542 and fix the half-bearings. When the threaded holes of
the actuator flange are in correspondence with the holes on the
valve flange screw the proper stud bolts. Screw the nuts on the
stud bolts and tighten up the valve flange is in contact with the
actuator flange.
4) Tighten the nuts of the connecting stud bolts evenly with the
torque prescribed in the table. The stud bolts must be made of
ASTM A320 L7 steel, the nuts must be made of ASTM A194 grade
2 steel as minimum.
B) To assemble the actuator onto the valve by bracket with shell
joint, perform the following operations:
1) -Check that the coupling dimensions of the valve flange and stem, or of
the relevant extension, meet the actuator coupling dimensions (valve
stem and flange). Lubricate the valve stem with grease in order to make
the assembly easier
2) To make easier the assembly, the valve stem has to be in perfect
vertical position.
