Welding Instructions - SPX APV DELTA SWmini4 Operating Manual

SWmini4-UK0.qxd / 08.2004
upper
valve housing
clamp connection
housing seal
lower
valve housing
Single Seat Valve DN10, 15, 20
DELTA SWmini4
Operating Manual : rev. 0
5.1

Welding Instructions

Shut-off valve SWmini41 / 42
- Before welding of the valves, remove the valve insert from the
housing (see chapter 10.I.c. - d.).
See to a careful handling of the parts to avoid damage.
Change-over valve SW mini 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 chapter 11.I.d. - e. and 11.II. a. - d.).
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 (EN 287-1).
(Seam quality EN 25817 „B").
- 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 best!
- 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.
UK
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