What is a DVGW butterfly valve?
A DVGW butterfly valve is a butterfly valve whose suitability for gas or drinking water has been tested and certified by the German Technical and Scientific Association for Gas and Water. The DVGW mark confirms that the valve meets the generally accepted rules of technology for tightness, material durability and hygienic safety. For you, this means planning certainty – every certified Fergo valve is supplied with the relevant proof.
Gas Butterfly Valve: DVGW Gas to DIN EN 13774
A gas butterfly valve with DVGW Gas approval is tested to DIN EN 13774, which covers metal isolating valves for gas distribution systems with operating pressures up to 16 bar and nominal sizes from DN25. At Fergo, the DVGW gas butterfly valve typically has a body in ductile iron GGG40 with epoxy coating, a disc in stainless steel 1.4408 (CF8M) and an NBR seat ring – the suitable seal for gaseous hydrocarbons.
For Natural Gas, Biogas and Methane: the Right Seal
For natural gas, biogas and methane, NBR is the proven standard material, as nitrile is resistant to gaseous hydrocarbons and oil-bearing components. Fuel gases are classified according to EN 437, and the DVGW gas operating range is typically -20 °C to +60 °C. For special media, we also advise on bespoke solutions in FKM or PTFE.
Drinking Water Butterfly Valve: DVGW Approval to W 270
A drinking water butterfly valve with DVGW approval uses an EPDM seat ring tested to DVGW Code of Practice W 270 (now EN 16421). This test proves that the sealing material does not promote impermissible microbial growth in contact with drinking water. The mechanical fitness for purpose is additionally verified to EN 1074 for water supply valves. Under national drinking water regulations, all components in contact with drinking water must meet the accepted rules of technology – the DVGW drinking water approval is the proof of this.
Choosing DN, PN, Material, Seal and Actuation
You select the right DVGW butterfly valve using a few technical criteria. Use the product configurator on this page:
- Nominal size: DN25 to DN1200 – from building services to large supply mains
- Connection: flange PN6, PN10, PN16 or ANSI Class 150 for international projects
- Design: space-saving wafer type or robust lug type
- Body: ductile iron GGG40 or stainless steel 1.4408 for high corrosion resistance
- Seal: EPDM for drinking water, NBR for gas
- Actuation: hand lever / gearbox, pneumatic actuator or electric J4C actuator
Thanks to the standardised mounting flange to ISO 5211, every valve can be automated at a later stage.
Butterfly Valve for Biogas, Methane and Natural Gas in Detail
A butterfly valve for biogas and other fuel gases is defined by the DVGW gas proof and the NBR seat ring, which resists methane and gaseous hydrocarbons. Typical applications are natural gas distribution, biogas plants and industrial gas pipelines. Butterfly valves have a shorter face-to-face length than many other valves, making them space-saving in the pipeline. Current DVGW developments show that soft-seated butterfly valves are even being certified for hydrogen – an indication of how future-proof this design is.
Available from Stock across Europe
Fergo holds many DVGW butterfly valves in stock – often delivered the next working day across Europe and the DACH region. Whether you are modernising a gas supply, extending a drinking water system or replacing parts in existing pipelines, you receive the right valve together with certificates, datasheets and declarations of conformity. With sensitive media such as gas or drinking water, precise selection pays off – our technical team is happy to advise you.
Conclusion
A DVGW butterfly valve secures standard-compliant operation for gas and drinking water. Choose NBR for gas, EPDM for drinking water and the right DN/PN combination. Configure your DVGW butterfly valve now or compare matching industrial ball valves – for any questions, reach our technical team directly.
FAQ – Your questions, our answers!
DVGW certification is mandatory for gas and drinking water pipes. It ensures that the fitting complies with regulations in terms of both technology and hygiene.
Yes. According to the Drinking Water Ordinance (TrinkwV), all products that come into contact with drinking water must comply with generally accepted technical standards. DVGW certification is proof of this. Without it, you not only risk public health, but also recourse claims.
EPDM is the standard here. It has been tested, is hygienically safe and durable.
For many industrial applications, yes – but not permitted for gas and drinking water. Certification is mandatory in these cases.