12
Single action positioner
Actuator with closing spring, flapper
nozzle set for reverse function
When the signal from the I/P unit
increases, the pressure C+ to the actuator is
increased. The valve stem moves upwards.
Actuator with closing spring, flapper
nozzle set for direct function
When the signal from the I/P unit
increases, the pressure C+ to the actuator is
reduced. The spring forces move the valve
stem downwards.
Actuator with opening spring, flapper
nozzle set for reverse function
When the signal from the I/P unit
increases, the pressure C+ to the actuator is
increased. The valve stem moves
downwards.
Actuator with opening spring, flapper
nozzle set for direct function
When the signal from the I/P unit
increases, the pressure C+ to the actuator is
reduced. The spring forces move the valve
stem upwards.
S
C+
S
C+
S
C+
S
C+
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