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6.
INSTALLATION AND COMMISSIONING
Before starting the installation process, check that you have all the parts needed for the valve assembly, and that the materials,
connection type and nominal pressure are suitable for the installation.
For solvent or welded connections, ensure also that the parts to be connected are of the same material and that you are using the
correct solvent or welding tools.
To install the valve, follow best installation practice recommendations provided on the Cepex website, paying particular attention to
thermal expansion and pipe alignment.
When filling the pipes with liquid, check that all the air is purged from the system and that the initial pressure does not exceed the
nominal pressure of the valve, or of the system element with the lowest nominal pressure rating.
Valve assembly using standard ISO-DIN, ANSI, JIS and BS/E flanges. Flat gaskets are not needed in the socket couplings, as they
are incorporated in the valve itself. Observe the tightening sequence of the screws on the flanges (Fig. 5) and the maximum
tightening torque. It is essential that all the screws are installed in order to ensure proper operation of the valve.
The PP/PE sockets for butt welding must be chamfered as indicated in the diagram (Fig. 6) and table (T6.2), to ensure correct opening
and closing of the disc.
Install the valve once the sockets are solvent-bonded and dry, to avoid problems with the adhesive (entry of the latter into the valve).
Flanges must be well centred on the valve (pay special attention to measurements 4" (DN100-DN125) and 8" (DN200). Assembly
misalignment could cause problems with the valve operation.
Fig. 4
It must be screwed all the holes in the
flange, even without correspondence in
the valves
Fig. 5
6.1 Exception (Valve 3" ANSI flanges)
When installing the 3 "valve with ANSI-150 flanges, the assembly requires special attention as only 2 bolts will coincide with the
valve holes, leaving the other 2 bolts on the outer side of the body, as shown in Fig.6 .
As always, all the holes in the flange must be bolted, even if they do not correspond to the valve.
Butterfly valve hole
Free
Butterfly valve hole
6
STANDARD BUTTERFLY VALVE
D
63
75
90
110
125
140
160
200
225
250
280
315
Free
Screws and screw tightening torque
DN
inch
Screws (A2)
DIN
50
-
4xM16x120
65
2 ½"
4xM16x140
80
3"
8xM16x150
100
4"
8xM16x160
125
-
8xM16x170
125
5"
8xM16x170
150
6"
8xM20x200
200
-
8xM20x210
200
8"
8xM20x230
250
-
12xM20x270
250
10"
12xM20x270
300
12"
12xM20x310
ENGLISH
T 6.1
Screws (A2)
Stud
-
-
4x5/8"x5 1/2"
-
8x5/8"x6"
-
8x5/8"x6 1/4"
-
-
-
8x3/4"x6 3/4"
-
8x3/4"x8"
-
-
-
-
8x3/4"x9 3/4"
-
-
12x7/8"x12"
-
12x7/8"x13 1/4"
Torque
Torque
(N·m)
(inch·lbs)
25
221
25
221
25
221
30
265
35
310
35
310
40
354
50
442
50
442
80
708
80
708
80
708
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