8
INDUSTRIAL PNEUMATIC BUTTERFLY VALVE
ENGLISH
5. INSTALLATION AND COMISSIONING
Before starting the installation process, check that all the parts needed for the valve assembly are there, 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 the correct solvent
or welding tools are used.
To install the valve, follow best installation practice recommendations provided on the Cepex website, paying specific attention to
thermal expansion and pipe alignment.
When filling the pipes with liquid, check that all the air has been 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. 6) and the maximum tightening
torque. All screws must be used in the flange 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. 7) and table (T5.2), 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 DN100-DN125 and DN200). Misalignment on
assembly could cause problems with the valve operation.
D
DN
inch
Screws (A2)
Torque
(N·m)
Torque
(inch·lbs)
63
50
-
4xM16x120
25
221
75
65
2 1/2”
4xM16x140
25
221
90
80
3”
8xM16x150
25
221
110
100
4”
8xM16x160
30
265
125
125
-
8xM16x170
35
310
140
125
5”
8xM16x170
35
310
160
150
6”
8xM20x200
40
354
200
200
-
8xM20x210
50
442
225
200
8”
8xM20x230
50
442
250
250
-
12xM20x270
80
708
280
250
10”
12xM20x270
80
708
315
300
12”
12xM20x310
80
708
Screws and screw tightening torque
DN
D min.
x
65
50.5
30º
80
70
30º
100
91.5
30º
125
113
30º
150
141
30º
200
191.5
20º
250
226
20º
300
296.5
20º
T 5.1
Fig. 5
Fig. 6
Fig. 7
Pipe and chamfer
measurements
PP/PE sockets
T 5.2
