Metso NP724 - Page 7

7 NP 72 en 7
Fig. 5 Positioner actions
NOTE: In positioner NP727 the changeover piece can be used in position R only.
DOUBLE-ACTING
1. Increasing input signal to open valve.
Cam segments:
B/0-100, A/0-50, A/50-100
2. Increasing input signal to close valve.
Cam segments:
A/0-100, B/0-50, B/50-100
NOTE:
Reverse piping for ST actuators.
SINGLE-ACTING
(SPRING TO CLOSE)
3. Increasing input signal to open valve.
Spring to close valve.
Cam segments:
B/0-100, A/0-50, A/50-100
4. Increasing input signal to close valve.
Spring to open valve.
Cam segments:
B/0-100, A/0-50, A/50-100
WARNING:
Valve closes exceptionally counterclockwise.
Unsuitable for Q, R, T5, F and L series valve
NOTE:
Reverse piping for ST actuators. Spring and
piston in the opposite position from shown.
SINGLE-ACTING
(SPRING TO OPEN)
5. Increasing input signal to close valve.
Spring to open valve.
Cam segments:
A/0-100, B/0-50, B/50-100
NOTE:
Reverse piping for ST actuators. Spring and piston in
the opposite position from shown.