Installa on, Opera on and Maintenance VL10/…‐en Rev.08/2018
Page 11
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ENGLISH
4.05 REPLACEMENT OF THE SEAT/PLUG OF THE VALVE WITH BELLOWS
By referring to Pic. 10 perform the following steps:
Separate the actuator from the valve body as described in the previous paragraph
Loosen the nut (10) and fully unscrew the bolts (15).
Separate the bonnet group (9) from the valve body (1).
Remove the complete plug (3) from the bonnet (9).
Remove the pin (17) and remove the plug (3)
If required, unscrew the bellows block (19) and replace it, by replacing also the gasket (18)
If required, unscrew and replace the seat (2) by using the specific wrenches
Insert in the bonnet (9) the new plug by paying attention to grease the stem with the silicone oil.
Always replace the body gasket (11) by carefully cleaning the supporting surfaces.
Re-assemble everything by repeating the steps in the reverse order and pay specific attention to the re-
alignment of stem, seat and plug.
Gradually tighten the nuts (15) in criss-cross sequence, as indicated in the example in Pic.2 paragraph 2.01
by applying the torques indicated in chapter 5
Attention:
when the plug is being replaced it is also nessesary to replace the packing gland (see next
paragraphs).
15
Pic. 10 Valve with bellows
17
18
19
