12
March 2022
Installation, Operation and Maintenance Manual
MAN 707 Rev. 3
Section 3: Operation and Use
Operation and Use
Section 3: Operation and Use
3.1
Operation Description
The supply fluid pressurizes the hydraulic cylinder chamber relevant to the operation to
carry out (opening or closing) (see following pages). This pressure starts the linear motion
of the piston and the consequent motion of the valve stem that is coupled. The spring
action operates the valve stem in the opposite direction (fail-safe position).
Figure 7
For local or remote operations, please refer to technical documentation furnished with
actuators. Electro-hydraulic power pack and control systems are supplied on specific
customer demand.
NOTICE
For all the relevant information, please refer to the specific documentation supplied.
Hydraulic return
connection
Hydraulic supply
connection
