OLGAS-H
– High pressure spring return hydraulic actuator
Use and maintenance manual
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Pag. 36
Contents may change without notice
Viscosity at -30° C
39cST
Viscosity at 20° C
5,8 cST
Viscosity at 50° C
2,1 cST
Flash point
152° C
Pour point
-68° C
Specific weight
0,897 Kg/dm3
(or equivalent)
5.2 EXTRAORDINARY MAINTENANCE
If there are leaks in the hydraulic cylinder, or a malfunction in the
mechanical components, or in case of scheduled preventive
maintenance, the actuator must be disassembled and seals must be
replaced with reference to the follow general sectional drawing and
adopting the following procedures:
If the actuator can be operated, it is essential to take it to fail
safe position, with the spring totally extended, otherwise the
actuator should be disassembled from the valve and follow
these steps:
❑
Remove the plug (27) from the cylinder end flange
❑
Record the length between end flange (26) and stop-setting
screw (21), as in figure A
