Answer / carl_ellis

Many manufacturers make all positioners a double acting
positioner and install a plug in the 2nd port and call the
model with the plugged 2nd port a single acting positioner.

No guarantee that all manufacturers do so, but it's true for
some of them.

You have a double action positioner - install a plug in the
2nd output port, plumb it to air and an actuator, give it
try as a single acting positioner and see if it works.

What do you have to lose?

Carl Ellis
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