23
Installation, Operation and Maintenance Manual
MAN 571_EAC Rev. 1
September 2020
Operation and Use
Section 3: Operation and Use
Gas supply connection
(downstream the valve)
Auxiliary
gas supply
Gas supply connection
(upstream the valve)
Gas
exhaust
Close
Open
Electronic connection
to solenoid valves
and to micro-switches
Figure 18
Operating Diagram
Electric remote control to open and to close
Energize solenoid valve 724-P0 to open or 724-PC to
close the actuator during all the valve stroke. Solenoid
valves must be de-energized at the end of the actuator
operation.
Local control to open and to close
Press lever on valve 724-P0 to open or 724-PC to close.
Manual operation
Select by the valve 18-C the opening or closing
operation and actuate the handpump 18-A.
Note: the directional control valve 18-C must be in
''automatic"- position to allow the operation
with gas supply.
Torque limiting device
When the actuator output torque exceeds the set
value. The torque limiting switch 772 stops the gas flow
to the relevant gas-hydraulic tank 4 and the enclosed
gas is exhausted.
Note: the operating diagram is drawn with solenoid
valves coils not energized.
1
Double acting gas over oil actuator
4
Gas-hydrauuc tank
18
Hydraulic manual override
a - Handpump
b - Adjustable relief valve
c - Hand operated directional control valve
41
Electric micro-switches
528 Unidirectional flow regulator (adjustable setting)
601 Stop valve
610 Gas dehydrating filter/condensate separator
611 Mechanical filter
623 Dust excluder with check valve
627 Higher pressure shuttle valve
(double check valve)
724 Double 3/2 N.C. solenoid valve with manual
override
PC - 3/2 N.C. pil. solenoid valve. man. overr.
(to close)
PO - 3/2 N.C. pil. solenoid valve. man. overr.
(to open)
DC - 3/2 N.C. pneum. pilot/ spring ret. valve
(to close)
DO - 3/2 N.C. pneum. pilot/ spring ret. valve
(to open)
772 Torque limiting switch
781 Hydraulic filter
801 Control valves enclosure with vent valve
966 Terminals enclosure
Pneumatic connection
Hydraulic connection
Electric connection
