16
February 2022
Installation, Operation and Maintenance Manual
MAN 607 Rev. 6
Section 3: Operation and Use
Operation and Use
Figure 14
1. Scotch yoke mechanism
2. Hydraulic cylinder
3. Hydraulic cylinder override
D=Directional control valve
P=Handpump
R=Relief valve
O=Oil tank
1 2
3
P
R
O
The OLGA-H actuators can only have the hydraulic manual override for local operation. The
compact hydraulic control unit mounted on the actuator consist of:
•
handpump
•
directional control valve to select “to open” or “to close” actuator operation
•
relief valve to prevent the oil pressure delivered by the handpump from exceeding
the maximum allowable value
•
oil tank
Accessories are available on request, for instance:
•
dual pilot-operated check valve
•
bladder-type or piston-type accumulator delivered by the handpump from
exceeding the maximum allowable value. On request, the emergency manual
override can be included in the power pack.
