Z tapping system

Z system – The valve range for all line types

It is used for simple tapping of pressurised supply lines made of PVC, PE-HD, cast iron, steel or asbestos cement.

The valves are generally tapped in a vertical direction, the outflow side outlet is carried out in the horizontal direction. They can be used in gas supply lines up to MOP 5 and in water supply up to a nominal pressure of PN16.

Drinking water ordinance
The quality of drinking water is regulated legally in the Drinking water ordinance. Different guidelines, legal basis, recommendations and regulations come in addition to this that place the highest demands in quality and corrosion protection on our tapping valves.

For this reason, Keulahütte Lüneburg Armaturen GmbH has introduced a quality management system in accordance with DIN ISO 9001:2008 and works continuously on the further development of their products.

All models of the Z tapping system are subject to the type examination by the DVGW (German association for gas and water)

Corrosion protection

The surface coatings made from EKB powder coating or inside and outside enamel coating according to DIN EN ISO 11117: 2016-10 offer a reliable corrosion protection.

The enamel coating is a glass-type high-strength material that provides an extremely durable and long-lived protective coating during the baking process.

The enamel-coating is highly resistant against acids, lyes and other media and together with the metallic carrier material, takes on a permanent inseparable connection that protects safely against infiltration. It prevents the settling of mineral and organic components and does not require any further protective measures, even with soil class III.

The EKB powder coating is orientated on the test requirements of the QualityAssociation “Heavy Duty Corrosion Protection of Powder Coated Valves and Fittings (GSK)”. The layer thickness is at least 250 µm.


– Spherical graphite iron EN-JS 1050 (GGG 50)
– Brass: CuZn21Si3 (ECOBRASS)
– Non-metallic seals: for use in drinking water and gas supply incl. DVGW regulation no., KTW and W270
– Auxiliary shut-off: Polyacetal Hostaform
– Spindle: 1.4305 (X8 CrNi18-9)
– Fastening screws: DIN 931-A2
– Nuts: DIN 934-A4 or DIN 934-CuNiSi
– Valve cone: Grilamid TR 90 (KTW, W270)
– Powder coating: Resicoat R4-FB (>250 µm)
– Enamel coating according to DIN EN ISO 11117 (>250 µm)


Drinking water supply:
Nominal pressure level: PN 16,
Test specifications: DVGW W 336, UBA KTW, UBA METALS,

Gas supply:
All gases according to DVGW work sheet G 260,
nominal pressure level: MOP 5

This post is also available in: German