10
APV_DKR2 ATEX_UK-0_022018.indd
UK
Double Seat Ball Valve DELTA DKR2
ATEX Design
Instruction Manual: UK-0
APV
7.
Installation
7.1.
Welding Instructions
- Welding may only be carried out by certified welders (DIN EN ISO
9606-1). (seam quality DIN EN ISO 5817).
-
The welding of the mating flanges must be effected in such a way
that deformation strain cannot be transfered to the valve body.
- TIG orbital welding is the most appropriate method.
- Before welding, all heat sensitive parts of the valve must be
removed! Dismantle valve ball housing with seals between the
counterflanges.
-
To simplify welding, fitting parts can be supplied as assembly inserts
(see table).
- The preparation of the weld seam up to 3 mm thickness must be
carried out as a square butt joint without air. (Consider shrinkage!)
-
After welding of the mating flanges and after work at the pipelines,
the corresponding parts of the installation or pipelines must be
cleaned from welding residues and soiling.
If these cleaning instructions are not observed, welding residues
and dirt particles can settle in the valve and cause damage or be
carried over to other parts of the installation.
- Any damage resulting from the non-observance of these welding
instructions is not subject to our guarantee.
7.2.
Assembly inserts for the double seat ball valves are available:
DN
Inch
ref.-No.
ID-No.
25
1"
000 08-48-250/
H207954
40
1,5"
000 08-48-251
H207955
50
2"
000 08-48-252/
H207956
65
2,5"
000 08-48-253/
H207957
80
000 08-48-254/
H207959
3"
000 08-48-257/
H207958
100
4"
000 08-48-255/
H167623
Fig. 7.2. assembly inserts