GENER
AL
INFO
SPECS
MOUNTING
ST
AR
T UP
OPER
ATION
M
AINTENANCE
DIMENSIONS
HO
W
TO
ORDER
LOGISTICS
31
NDX VALVE CONTROLLER
Fig. 35 Operation directions and air connections
I
II
I
II
I
II
I
II
DOUBLE-ACTING ACUATOR
1. Increasing input singnal to open valve (shown)
Actuator type: Double acting
Positioner fail action: Close
Signal direction: Rising
Other parameters according to assembly
2. Increasing input signal to close valve (not recommended)
Actuator type: Double acting
Positioner fail action: Close
Signal direction: Falling
Other parameters according to assembly
DOUBLE-ACTING ACTUATOR, REVERSED PIPING
3. Increasing input signal to open valve (not recommended)
Actuator type: Double acting
Positioner fail action: Open
Signal direction: Rising
Other parameters according to assembly
4. Increasing input signal to close valve (shown)
Actuator type: Double acting
Positioner fail action: Open
Signal direction: Falling
Other parameters according to assembly
SINGLE-ACTING ACTUATOR, SPRING TO CLOSE
5. Increasing input signal to open valve (shown)
Actuator type: Single acting
Positioner fail action: Close (must be in the spring direction)
Signal direction: Rising
Other parameters according to assembly
6. Increasing input signal to close valve (not recommended)
Actuator type: Single acting
Positioner fail action: Close (must be in the spring direction)
Signal direction: Falling
Other parameters according to assembly
SINGLE-ACTING ACTUATOR, SPRING TO OPEN
7. Increasing input signal to close valve (shown)
Actuator type: Single acting
Positioner fail action: Open (must be in the spring direction)
Signal direction: Falling
Other parameters according to assembly
8. Increasing input signal to open valve (not recommended)
Actuator type: Single acting
Positioner fail action: Open (must be in the spring direction)
Signal direction: Rising
Other parameters according to assembly
9
PNEUMATICS PIPING
MOUNTING
