Replacement Of The Diaphragm - OMC AP23 Installation, Operation And Maintenance Manual

4.0 REPLACEMENT OF THE DIAPHRAGM

Separate the actuator from the valve as described in paragraph 4.01
By referring to Pic.17 for the direct-action actuators and to Pic.18 for the reverse-action actuators, perform the
following operations:
ATTENTION!!! Tensioned springs
 gradually
unscrew the bolts (1) in criss-cross sequence

extract the lid (2) unscrew the nut (3) which blocks the plate (5) and replace the diaphragm (4).

if required, replace the v-ring inside the stem-guide (7)

re-assemble everything by performing the operations in the reverse order.
Attention: for valves provided with bellows, in order to prevent any damages to the bellows, make sure that the
plug stem (6) does not rotate.
For the tightening forces refer to chapter 6
Pic. 17 Direct-action actuator
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Installa on, Opera on and Maintenance Manual ManA ‐en Rev.03/2018
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Pic. 18 Reverse-action actuator
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