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.
16
/24
6.5
R
EPLACEMENT
O
F
T
HE
S
EAT
/P
LUG
O
F
T
HE
V
ALVE
W
ITH
Q
UICK
C
HANGE
S
EAT
By referring to Fig. 14 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 seat blocking cage (13)
If required, remove and replace the seat (2).
Insert in the bonnet (9) the new plug by paying attention to grease the stem with
silicone oil.
Always replace the body gasket (11) and the seat gasket (14) and carefully clean 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. 14 - Valve with Quick Change seat
