OLGAS-H
– High pressure spring return hydraulic actuator
Use and maintenance manual
© Copyright by BIFFI Italia. All right reserved.
Pag. 15
Contents may change without notice
Failure to comply with the following procedures may impair
product warranty. Installation, commissioning and maintenance
and repair works should be carried out by qualified staff.
A non-conforming assembly could be the source of serious
accidents.
For actuator assembly on the valve:
Check that the assembly position, as shown on the
documentation, complies with system’s geometry. Check the
consistency of the parts of actuator-valve coupling.
❑
Operate the actuator so that it reaches the position matching valve
position (Section 3.3).
❑
Lubricate valve stem with oil or grease.
❑
Properly clean and remove grease from coupling flange surfaces.
❑
Connect, if supplied separately, the adjustment insert to valve stem
and fasten it with the special fastening pins.
❑
Lift the actuator using the special lifting points (Sect. 2.2).
❑
Install the actuator so that valve stem inserts in the coupling area.
This coupling should be made without forcing.
❑
Fasten the two parts with the threaded connections (screws, tie
rods, nuts). If holes of coupling flanges are not aligned, adequately
operate the actuator if necessary move the mechanical stops
backwards (Sect. 3.4).
❑
Fasten threaded connections. Please refer to Table 1.
Table 1:
nuts tightening torque
Threading
Tightening
torque (Nm)
M8
20
M10
40
M12
70
M14
110
M16
160
M20
320
M22
420
M24
550
M27
800
M30
1100
M33
1400
M36
1700
