Use is possible in the following areas among others:

• Drinking water installations

  – with Raxofix PE‑Xc/AI/PE‑Xc pipes (dimensionally stable, with external oxygen seal coat)

  – with Raxofix PE‑Xc pipes (flexible without external oxygen seal coat)

The general rules of engineering and the applicable regulations must be observed for planning, execution, operation and maintenance potable water installations, see Regulations from section: Fields of application .

The model is also suitable for the following media, amongst others:

• Drinking water without limitations acc. to the applicable directives, see Regulations from section: Media

• maximum chloride concentration 250 mg/l pursuant to applicable regulations, see Regulations from section: Media

The model is equipped as follows:

• valve casing made of gunmetal/silicon bronze

• valve top made of gunmetal/silicon bronze (dead space free)

• dual-​sided Raxofix press connection with SC‑Contur

• valve seat and valve plate unit made of stainless steel

• backflow preventer (BP)

• Entleerungs- / Prüfstopfen

  drainage / testing plugs G¼ upstream and downstream from the backflow preventer

• key surface on the casing

• valve and spindle seal made of EPDM (maintenance-​free)

The model is fitted with a backflow preventer.

Backflow preventers only allow flowthrough in one direction (in the direction of flow). If the direction of flow changes, e.g. due to back suction, the backflow preventers close automatically.

The model is available in the following dimensions: d 16 / 20 / 25 / 32 / 40 / 50 / 63.

Viega press connections are equipped with the SC‑Contur. The SC‑Contur is a safety technology that is certified by the DVGW and ensures that the connection is guaranteed to be leaky in an unpressed state. In this way, unpressed connections are noticed immediately during a leakage test.

Viega guarantees that unpressed connections are visible during a leakage test:

• with wet leakage test in the pressure range from 0.1 hPa–0.65 MPa (1.0 mbar–6.5 bar)

• with dry leakage test in the pressure range from 22 hPa–0.3 MPa (22 mbar–3.0 bar)

The press connections are marked with a coloured dot. This identifies the SC‑Contur, where the test medium would escape in the case of an inadvertently unpressed connection.

The model is marked as follows:

• flow direction indicator

• noise class I pursuant to applicable regulations, see Regulations from section: Marking on components

• dimension

• DVGW writing

• green dot for potable water

• EA marking for classification in accordance with the applicable regulations, see Regulations from section: Marking on components

The model is equipped with Raxofix press connections and compatible with the Raxofix system.

Raxofix plastic pipes are available as coiled bundle with and without protective pipe, and with various insulation thicknesses. Dimensionally stable multilayer pipes are also available in 5 m lengths. The following pipes are available:

• Raxofix PE‑Xc/AI/Pe-​Xc

  • dimensionally stable

  • with external oxygen seal coat

  • d 16, 20, 25, 32, 40, 50, 63

• Raxofix PE‑Xc

  • flexible

  • without external oxygen seal coat

  • d 16, 20

Backflow preventers protect fittings and installation systems against unintended backflow, back pressure or back suction of the contaminated wastewater or dirty water in the piping system. This can occur after pressure fluctuations in the distributor circuit, which can cause a change in the direction of flow.

The backflow preventer prevents the pushing back, backflow or back suction of liquids, which may be a health hazard, into the public drinking water network, with the help of a spring-​loaded valve cone. The dimension is dependent on the peak pressure and it complies with the nominal width of the pipeline. The backflow preventer must be fitted with testing equipment.

In many countries, standards and technical guidelines stipulate the use of backflow preventers or other suitable safety equipment that protect drinking water against contamination.

Observe the following operating conditions for the installation of the model:

The performance diagram shows the pressure losses (in hPa) in relation to the volume flow and the nominal width.

Overground pipelines and fittings in rooms do not normally require external corrosion protection.

There are exceptions in the following cases:

• Contact with aggressive building materials such as nitrite or materials containing ammonium

• in aggressive surroundings

If external corrosion protection is required, observe the pertinent guidelines, see Regulations from section: Corrosion .

System components may, in some cases, become damaged through transportation and storage.

• Check all parts.

• Replace damaged components.

• Do not repair damaged components.

• Contaminated components may not be installed.

Observe the following when mounting:

• flow direction indicator

• use suitable tools

The following tools are required for production of a press connection:

• press machine with constant pressing force

• suitable Raxofix press jaw for PE‑Xc systems

• pipe shear (model 5341) for dimensions 16–25 mm

• pipe cutters (model 2191) for dimensions 32–63 mm

• bending tool (model 5331 or 5331.2)

Recommended Viega press machines:

• Pressgun 5

• Pressgun Picco

• Pressgun 4E / 4B

• Picco

• Type PT3-AH

• Type PT3-H / EH

• Type 2 (PT2)

For information about tools, also see Required tools .

The installer must perform a leakage test before commissioning.

Carry out this test on a system that is finished but not yet covered.

Comply with the general rules of engineering and the applicable directives, see Regulations from section: Leakage test .

Document the result.