Flowserve PMV P4 - Manual (Page 20)

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4
Feedback spring
Once the front cover and indicator are remo-
ved, the feedback spring can be easily
accessed.
Hold the spring 1 from the top, pull down
and out.
When installing, hold the assembly at the top,
guide the lower part to position on the zero
screw, then press down until it fits easily un-
der the balance arm 2. Make sure that the
assembly is aligned properly against the
lower arm and the notch is engaged in the
tab on the balance arm 2.
Balance arm
The balance arm 3 can only be removed after
I/P unit, diaphragm and feedback spring have
been removed. (See sections above and on
page 16, 18 and 19).
Loosen the screws 3 and the balance arm can
be removed.
installing the balance arm make sure that the
leafspring 4 on the underside of the balance
arm 5 is properly engaged into the groove 6
of the spool in the pilot valve. Tighten the
two screws 3 holding the balance arm to the
positioner.