17
Installation, Operation and Maintenance Manual
MAN 607 Rev. 6
February 2022
Section 3: Operation and Use
Operation and Use
Figure 15
The OLGA-H actuators can have an emergency manual override in addition to the local
and/or remote control panel which controls the oil supplied by a power pack for the
“normal” actuator operation. The emergency manual override mounted on the actuator
consists of a hydraulic manual override and a hydraulic manual selector to choose actuator
“Normal operation” with oil supply from a power pack, or the “Emergency manual
operation”. The compact hydraulic override consists of:
•
handpump
•
directional control valve to select the “to open” or “to close” operation
by handpump
•
relief valve to prevent the oil pressure delivered by the handpump from exceeding
the maximum allowable value. On request, the emergency manual override can be
included in the power pack.
1. Scotch yoke mechanism
2. Hydraulic cylinder
3. Hydraulic cylinder override
4. Hydraulic manual selector
D=Directional control valve
P=Handpump
R=Relief valve
O=Oil tank
3.3.2
Emergency Manual Operation by MHP
P
R
O
1
4
2
3
