Installa on, Opera on and Maintenance Manual ManA ‐en Rev.03/2018
Page 10
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ENGLISH
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
Pic. 18 Reverse-action actuator
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