ED. 2009/11
Receiving and installing
9
3.8.
WELDING.
The welding work can only be carried out by persons qualified, trained and equipped with the
necessary means to carry out this work.
Disassemble the valve before starting the welding work.
3.8.1.
Weld / weld single-seat valve. Fig. N/K/M
•
Disassemble the valve as indicated in section 7.
Assembly and disassembly
•
Weld the valve body to the pipes.
•
When welding the valve body, it is very important to maintain the minimum distance (dimension A) enabling
disassembly of the valve for later checks and replacement of valve parts (e.g. seals, springs). It is important to note the
difference when the valve has a control head. (dimension B)
•
In K-type valves, it is advisable to use connection adapters to connect one of the bodies in order to facilitate
disassembly of the valve.
3.8.2.
Weld tank bottom single-seat valve (NLFI / NLFM)
DN
A
B
25-1” 330 430
40-1 ½”
350
450
50-2” 440 540
65 - 2 ½” 510
610
80 - 3”
530
630
100-4” 585 685
DN
Diam. d1 Diam. d2
h
25
155 150 3
40
155 150 3
50
165 160 3
65
195 190 3
80
215 210 3
100
255 250 3
A
Fig. NLFI
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