OPERATIVE MANUAL
MN-L20-A1
DC-18-10
MEC-RELA®
- www.mecrela.it – mecrela@terranova-instruments.com
a TERRANOVA® Srl brand
- www.terranova-instruments.com - VAT IT07848810151
Factory & Sales: Via Gramsci 1 – 26827 Terranova dei Passerini (LO) – Italy
Head Office: Via Rosso Medardo 16 – 20159 Milano – Italy Ph: +39 0377 919119 – Fax: +39 0377
855720
Pa
g.
18
/24
6.7
R
EPLACEMENT
O
F
T
HE
S
EAT
/P
LUG
O
F
T
HE
V
ALVE
W
ITH
B
ELLOWS
By referring to Fig. 16 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 realignment of stem, seat and plug.
Gradually tighten the nuts (15) in criss-cross sequence, as indicated in the example
in Fig. 2 paragraph 4.01 by applying the torques indicated in chapter 7.
A
TTENTION
!
When
the plug is being replaced it is also necessary to replace the packing gland (see next
paragraphs).
Fig. 16 - Valve with bellows
