9
APV_SWmini4_GB-2_042020.indd
Single Seat and Change-over Valve
DELTA SWmini4
Instruction manual: GB – rev. 2
GB
APV
7. Installation
7.4.
Welding Instructions
7.4.1. Shut-off valve SWmini 41/42
- Before welding of the valves, remove the valve insert from the
housing (see chapter 12.1. 3. - 4.).
See to a careful handling of the parts to avoid damage.
7.4.2. Change-over valve SWmini 43/44
- The lower housing part (1), only, can be welded direct into the pipe
system.
Before welding of the lower housing, partly dismantle the valve (see
chapters 13.1. 4. - 5. and 13.2. 1. - 4.).
Remove the lower housing seal from the upper housing.
Provide the upper housing and the upper pipeline with detachable
connections (flange, clamps, etc.).
See to a careful handling to avoid damage to the parts.
-
Welding may only be carried out by certified welders (DIN EN ISO
9606-1). (Seam quality DIN EN ISO 5817).
- The welding of the valve housings must be undertaken in such a
way that deformation strain cannot be transfered from the outside to
the valve body.
- The preparation of the weld must be carried out in butt manner as a
square butt joint without air. (Consider shrinkage!)
- TIG orbital welding is preferred!
-
After welding of the valve housings or 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.
- Any damage resulting from the nonobservance of these welding
instructions is not subject to our guarantee.
- Welding directives for aseptic applications shall be drawn from the
AWS/ANSI Directives and EHEDG Guidelines.
upper housing
clamp connection
remove housing seal
lower housing
