5 Installation at Site
18 of 38
ECOLINE GT 40
7367.8/06-EN
CAUTION
Weld beads, scale and other impurities
Damage to the valve!
▷
Take suitable measures to protect the valve against impurities.
▷
Remove any impurities from the piping.
▷
If necessary, install a strainer.
CAUTION
Incorrect earthing during welding work on the piping
Damage to the valve (scorching)!
▷
Fully open the valve during welding. If the valve is equipped with a back seat,
run the obturator to an intermediate position.
▷
Never earth the electric welding equipment on the valve's functional parts.
CAUTION
Non-compliance with the max. permissible application temperature
Damage to the valve!
▷
Complete the weld seam in several steps to ensure that the temperature in the
middle of the body does not exceed the max. permissible application
temperature.
NOTE
For valves with socket weld ends, comply with the insertion depth given in the
applicable technical code. A gap between the pipe end and the base of the weld
socket prevents impermissible stress on the weld.
▪
Provide sufficient clearance for removal of the valve and, if necessary, the
actuator.
▪
Maintain cleanliness when welding the valve into the piping. No contaminants
must enter the inside of the valve body; otherwise the seat/disc interface may
become damaged.
ü
The valve is installed in accordance with the appropriate pipeline isometry.
ü
Comply with the welding processes, filler metals and welding data laid down in
the documented welding procedure.
ü
The weld ends of valve and pipes have been centred.
1. Run the valve disc to the middle position prior to welding.
2. Check that the butt weld ends are clean and undamaged. Clean them if
necessary.
3. Weld the valve into the piping in such a way that the valve/pipe welds are not
subjected to stresses, strains or torsion. During the welding process, ensure
constancy of the gap to the pipeline without radial offset.
4. When installing the valve with the stem in a horizontal position, adequately
support the weight of the actuator or gearbox.
