The Fergo DVGW butterfly valve covers the two most common approval cases: a gas butterfly valve to DIN EN 13774 with NBR seat ring, and a drinking water butterfly valve to DVGW Code of Practice W 270 (EN 16421) with EPDM seat ring. Available in DN25 to DN1200, PN6/10/16 and ANSI Class 150, with a body in ductile iron GGG40 or stainless steel 1.4408. Many versions in stock – EU-wide delivery.
A gas butterfly valve, drinking water butterfly valve or DVGW butterfly valve is mandatory in regulated pipelines. Typical applications are public water supply, gas distribution networks and building or industrial services. The wrong seal choice or a missing approval creat...
The Fergo DVGW butterfly valve covers the two most common approval cases: a gas butterfly valve to DIN EN 13774 with NBR seat ring, and a drinking water butterfly valve to DVGW Code of Practice W 270 (EN 16421) with EPDM seat ring. Available in DN25 to DN1200, PN6/10/16 and ANSI Class 150, with a body in ductile iron GGG40 or stainless steel 1.4408. Many versions in stock – EU-wide delivery.
A gas butterfly valve, drinking water butterfly valve or DVGW butterfly valve is mandatory in regulated pipelines. Typical applications are public water supply, gas distribution networks and building or industrial services. The wrong seal choice or a missing approval creates retrofitting costs, shutdowns and legal risks. Fergo therefore supplies only valves with a valid certificate and complete documentation. Every valve ships with the correct material combination for the medium in service. In this butterfly valves category you find DVGW-certified models with manual, pneumatic or electric actuation. Use the product configurator above to choose nominal size, connection, body, seat ring and actuation.
What is a DVGW butterfly valve?
A DVGW butterfly valve is a valve whose gas or drinking water suitability is tested by the DVGW (German Technical and Scientific Association for Gas and Water). The DVGW mark confirms tightness, material durability and hygienic safety. Fergo supplies every certified valve with the relevant proof. A full overview of standards is on the Certifications & Approvals page.
Gas Butterfly Valve: DVGW Gas to DIN EN 13774
A gas butterfly valve with DVGW Gas approval is tested to DIN EN 13774. The standard covers metal isolating valves for gas distribution systems up to 16 bar. Nominal sizes start at DN25. Fergo models typically use a body in ductile iron GGG40 (epoxy-coated). The disc is stainless steel 1.4408; the seat ring is NBR. NBR is the proven material for gaseous hydrocarbons.
For Natural Gas, Biogas and Methane: the Right Seal
For natural gas, biogas and methane, NBR is the proven seat ring material. Nitrile stays resistant to gaseous hydrocarbons and oil-bearing components under long service. The classification of fuel gases follows the DVGW G 260 gas quality code. The permitted operating range of a DVGW gas valve is typically −20 °C to +60 °C. Fergo checks every configuration before shipping to match your installation. For special media such as sour gases or dry process gases we advise on FKM or PTFE seat rings. That way you find the right gas butterfly valve with the correct approval for critical applications too.
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). The test proves the sealing material does not promote microbial growth in contact with drinking water. Mechanical fitness is additionally verified to EN 1074 for water supply valves. Fergo models combine both proofs as standard.
EPDM seat ring & EU Drinking Water Directive
The EPDM seat ring of a drinking water butterfly valve provides tight shut-off between −10 °C and +90 °C. Under the EU Drinking Water Directive (2020/2184), all materials in contact with drinking water must meet the accepted technical rules. The DVGW approval is the practical proof for operators and inspection bodies. Typical applications are municipal water supply, service connections and fire water systems. Fergo delivers each valve with declaration of conformity, test protocol and material certificate. This way you document drinking water hygiene end to end for clients and authorities. For larger nominal sizes we recommend a gearbox for ergonomic operation.
Gas butterfly valve vs. drinking water butterfly valve: key differences
A gas butterfly valve differs from a drinking water butterfly valve mainly in seat ring and applicable standard. Otherwise, the basic build is identical. The table below summarises the key features at a glance:
| Feature | Gas butterfly valve | Drinking water butterfly valve |
|---|---|---|
| Approval | DVGW Gas to DIN EN 13774 | DVGW W 270 / EN 16421 + EN 1074 |
| Seat ring | NBR | EPDM |
| Operating pressure | up to 16 bar (PN16) | PN6 / PN10 / PN16 |
| Temperature range | −20 °C to +60 °C | −10 °C to +90 °C |
| Body | GGG40 with epoxy coating | GGG40 with epoxy coating or stainless steel 1.4408 |
| Typical use | natural gas, biogas, methane | drinking water, fire water, service water |
DN, PN, material & actuation selection
You choose the right DVGW butterfly valve using a few technical criteria. The product configurator above filters on these attributes:
- 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 version
- Body: ductile iron GGG40 or a stainless steel butterfly valve in 1.4408 for high corrosion resistance
- Seat ring: EPDM for drinking water, NBR for gas
- Disc: stainless steel 1.4408 or GGG40 with Resicoat R4 coating
- Actuation: hand lever, gearbox, pneumatic or electric quarter-turn actuator
- Approval: DVGW Gas to DIN EN 13774 or DVGW drinking water to W 270
The mounting flange follows ISO 5211. Every valve can therefore be automated at a later stage.
Automation: hand lever, pneumatic or electric quarter-turn actuator
Three standard actuation options are available. The manual version with aluminium hand lever suits smaller nominal sizes and low switching frequency. The hand lever offers tactile detent positions and secure shut-off without auxiliary power.
For frequent switching or larger nominal sizes we recommend a pneumatic quarter-turn actuator. Double-acting actuators fit continuous processes. Spring-return models act as fail-safe shut-off with a defined end position.
For fully automated plants an electric butterfly valve is the preferred choice. Fergo offers electric actuators with 24 V, 230 V or 240 V AC/DC. All actuators mount directly on the DVGW valves through the ISO 5211 flange. That way you can retrofit an existing hand-lever valve later without replacing the body.
DVGW butterfly valve from stock: EU-wide delivery
Fergo holds many DVGW butterfly valve variants directly in stock. Standard shipping reaches customers across Europe within a few working days. In the DACH region delivery is often next working day. Each valve ships with certificate, datasheet and declaration of conformity. Whether you are modernising, extending a drinking water system or replacing existing lines, you receive the correct valve ready for installation. For larger projects the technical team coordinates scheduled deliveries and bespoke configurations.
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.