Also comply with the information in Corrosion .

Use is possible in the following areas among others:

• Gas installations

• Liquid gas installations

For planning, execution, modification and operation of gas installations, observe the applicable regulations, see Regulations from section: Application areas .

Use is possible in the gas installations described below:

• Gas installations

  • Low pressure range ≤ 100 hPa (100 mbar)

  • Medium pressure range from 100 hPa (100 mbar) up to 0.1 MPa (1 bar)

• Liquid gas installations

  • With liquid gas tank in medium pressure range downstream of the pressure regulating valve, 1st level on the liquid gas tank > 100 hPa (100 mbar) up to a permitted operating pressure of 0.5 MPa (5 bar)

  • With liquid gas tank in the low pressure range ≤ 100 hPa (100 mbar) behind the pressure regulating valve, 2nd level

  • With liquid gas pressurised container (liquid gas bottles) < 16 kg

    Behind the small bottle pressure regulating valve

  • With liquid gas tank (liquid gas bottle) ≥ 16 kg

    Behind the large bottle pressure regulating device

Observe the applicable regulations, see Regulations from section: Application areas .

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

• Gases, see Regulations from section: Media

• Liquid gases, only in the gaseous state for domestic and commercial applications, see Regulations from section: Media .

The model is equipped as follows:

• casing made of chrome-​plated brass

• inlet side with R external thread

• Output side with Rp internal thread screw fitting with sealing element mounted on the cone

• Grey actuating handle with safety catch

• Thermal shut-​off system (TSS)

An automatically locking safety shut-​off is integrated into the model. To open, press the handle before turning it.

A thermally activated shut-​off system (TSS) is integrated into this model.

For fire safety reasons, a TSS is required for gas devices and other components that do not fulfil the HTR requirements. The TSS complies with the requirements of the applicable regulations, see Standards and regulations .

The model is available in the following dimensions: R / Rp ½ / ¾ / 1.

Prerequisite for a threaded connection, which seals via a thread, is a threaded pair in accordance with applicable regulations, see Regulations from section: Threaded connection . Pursuant to these regulations, a permitted threaded pair comprises a conical external thread and a cylindrical internal thread, e.g. R ¾ and Rp ¾.

Only use commercially available and chloride-​free, DVGW approved sealant in accordance with the applicable regulations to seal threads, see Regulations from section: Threaded connection .

The model is marked as follows:

• MOP5 for maximum operating pressure 0.5 MPa (5 bar)

• GT1 for maximum operating pressure with HTR requirement 0.1 MPa (1 bar)

• Flow direction indicator

• DVGW writing

• Dimension

• Position indicator

• TSS marking for thermal shut-​off system

Please contact the Viega Service Center for questions on this subject.

The cone seal is pre-​stressed with a spring and is held in position by a soldered strut. The spring slackens and pushes the valve cone into the outlet. The gas flow is then blocked and the valve is now permanently closed gas-​tight.

Meet requirements according to applicable directives, see Regulations from section: Functionality :
Thermal shut-​off system (TSS) must trigger at a temperature load of 95 °C ± 5 K, i.e. close automatically, and may only have a harmless leakage rate after a temperature load of 650 °C over a period of 30 minutes.

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

In accordance with the valid regulations, the scope of the operating temperature is between -20 °C and 60 °C, see Standards and regulations .

Depending on the area of use, corrosion protection measures may have to be taken into account.

One differentiates between external pipelines (underground and overground external pipelines), as well as internal pipelines.

Information about the area of use, also see Areas of application .

Observe the pertinent guidelines for corrosion protection, see Regulations from section: Corrosion .

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

There are exceptions in the following cases:

• There is external contact with materials containing chloride.

• Stainless steel pipes must not come into contact with building materials or mortar containing chloride.

• There is contact with aggressive building materials such as materials containing nitrite or ammonium.

• in aggressive surroundings

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:

• Observe flow direction indicator.

• Do not cover or paint the model.

• Do not install the model in heat zones (e.g. with hot emissions or strong heat radiation.

• Check the sealing element on the cone for damage. For the visual check, loosen the union nut and then fasten it again. After the visual inspection, tighten the screw connection of the output side as required.

• Use suitable tools.

Exceptions, selection criteria and the arrangement of the components are described in the applicable regulations, see Standards and regulations .

The installer must perform a leakage test before commissioning.

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

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

Document the result.