Cla-Val 131-01/631-01 - Manual (Page 38)

AC
POWER
131-01 Valve
AC
POWER
AC
Power
AUX
Power
131-01 Valve
AC
POWER
Maintain Valve Position
When there is a power failure, using the standard Model 131-01
Control Valve, the pilot control solenoids lock in the closed
position and hold the main valve in the last control position.
Hydraulic Backup
A second hydraulic pilot system is arranged in parallel with the
electronic system. On power failure, a third solenoid switches
the control from electronic to the backup hydraulic system. The
hydraulic system will then modulate the valve to maintain pre-
set system conditions. Virtually any hydraulic system can be
used.
Direct Voltage Electronic Control
Customer supplied battery power, with a continuous charging
system, operates the valve solenoids and controller in the event
of power failure.
Open or Close Valve
Adds a third solenoid control to the pilot system which either opens
or closes the main valve on power failure.
Transmitter Signal Failure
The 131VC-1 Electronic Control System contains several indis-
pensible sub-routines that protect the system if there is a trans-
mitter signal failure. The controller has, as standard, terminals for
a second transmitter and can be configured to automatically
default to that transmitter. The controller can also be configured
to cause the valve to remain in last control position, to open or
close at an electronically controlled rate, or alarm to an auxiliary
hydraulic pilot system.
Remote Communications Failure
The 131VC-1 Electronic Control System is the final link in the
communications system at the valve site. In the event of a fail-
ure, the controller will continues to function, maintaining the
valve at the last set-point command or a pre-programmed set-
point. It can also have a new set-point entered on the key pad
by the Operator.
Power Failure Options
DC
POWER
POWER
SUPPLY