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Industriearmaturen DVGW Butterfly Valves

DVGW Butterfly Valves for Gas & Drinking Water — Buy Online

DVGW-certified butterfly valves in ductile iron GGG40 or stainless steel 1.4408, as wafer or lug type, NBR for gas or EPDM for drinking water, DN40 to DN500, PN10/PN16.

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DVGW Butterfly Valves
  • Edelstahl Absperrklappe DVGW Gas Typ AK210G

    Edelstahl Absperrklappe DVGW Gas Typ AK210G

    Sizes: DN50–DN200

    Flange connection: PN6, PN10, PN16, ANSI Class150

    Body: CF8M (1.4408)

    Certificates: DVGW GAS nach DIN EN 13774

    Operations: Electric, pneumatic double-acting & single-acting, hand lever, gearbox

  • Stainless Steel Butterfly Valve, DVGW Drinking Water AK210W

    Stainless Steel Butterfly Valve, DVGW Drinking Water AK210W

    Sizes: DN50 – DN200

    Flange connection: PN6, PN10, PN16, ANSI Class150

    Body: CF8M (1.4408)

    Certificates: DVGW Trinkwasser

    Operations: Electric, pneumatic double-acting & single-acting, hand lever, gearbox

  • Edelstahl Absperrklappe DVGW Trinkwasser Typ AK211W

    Edelstahl Absperrklappe DVGW Trinkwasser Typ AK211W

    Sizes: DN50 – DN200

    Flange connection: PN10, PN16, ANSI Class150

    Body: CF8M (1.4408)

    Disc: CF8M (1.4408)

    Operations: Electric, Pneumatic double-acting & single-acting, Hand lever, Gearbox

  • Flanged Butterfly Valve DVGW Gas Stainless Steel AK211G

    Flanged Butterfly Valve DVGW Gas Stainless Steel AK211G

    Sizes: DN50 – DN200

    Flange connection: PN10, PN16, ANSI Class150

    Body: CF8M (1.4408)

    Certificates: DVGW GAS nach DIN EN 13774

    Operations: Electric, Pneumatic double-acting & single-acting, Hand lever, Gearbox

  • Gas Wafer Type Butterfly Valve Type AK210G

    Gas Wafer Type Butterfly Valve Type AK210G

    Sizes: DN25 – DN1200

    Flange connection: PN6, PN10, PN16, ANSI 150

    Case material: GGG40 + Epoxy 120µm GJS400

    Flap: GJS400, CF8M (1.4408)

    Operations: Electric, Pneumatic double-acting & single-acting, Hand lever, Gearbox

  • Flanged shut-off butterfly valve for gas AK211G

    Flanged shut-off butterfly valve for gas AK211G

    Sizes: DN25 – DN600

    Flange connection: PN10, PN16

    Case material: GGG40 + epoxy 120 µm GJS400

    Flap: GJS400, CF8M (1.4408)

    Operations: Electric, Pneumatic double-acting & single-acting, Hand lever, Gearbox

  • Drinking Water Butterfly Valve Type AK210W

    Drinking Water Butterfly Valve Type AK210W

    Operations: Electric motor, Pneumatic double-acting, Pneumatic single-acting, Hand lever, Mounting flange (ISO 5211), Gearbox with handwheel

    Sizes: DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300

    Face-to-face: DIN EN 558-1 Reihe 20

    Flap: CF8M (1.4408)

    Pressure range: PN10, PN16

  • Flanged shut-off butterfly valve for drinking water, type AK211W

    Flanged shut-off butterfly valve for drinking water, type AK211W

    Sizes: DN25 – DN300

    Flange connection: PN10, PN16

    Case material: GJS400 GGG40 + epoxy 120 µm, RAL5015

    Flap seal: EPDM

    Operations: Electric, Pneumatic double-acting & single-acting, Hand lever, Gearbox

Product Overview

DVGW Butterfly Valves: Certified Shut-Off for Gas and Drinking Water

A DVGW butterfly valve is a centric butterfly valve that carries an official Deutscher Verein des Gas- und Wasserfaches approval for gas distribution, drinking water supply or both. The disc rotates a quarter turn on a central shaft and seals against a resilient seat ring, so shut-off is tight, fast and repeatable. Consequently the DVGW certification is required for every valve installed in German gas grids under DIN EN 13774 and in every drinking water network that must comply with the German Drinking Water Ordinance.

Fergo supplies the AK210 wafer series and the AK211 lug series in two housing materials — ductile iron GGG40 with epoxy coating and stainless steel CF8M / 1.4408. The suffix marks the medium: G for gas (NBR seat, DVGW Gas to DIN EN 13774) and W for drinking water (EPDM seat, DVGW drinking water approval). Nominal sizes cover DN40 to DN500 at PN10 and PN16, wafer face-to-face lengths follow EN 558-1 Series 20, flange dimensions comply with EN 1092-1, and actuator flanges meet ISO 5211.

DVGW butterfly valves serve municipal gas grids, biogas plants, drinking water utilities, water treatment stations, district heating networks and HVAC systems throughout Germany, Austria, Switzerland and beyond. Operators choose between an aluminium hand lever, a gearbox, a pneumatic actuator or the J4C electric actuator. For applications outside the gas and drinking water scope, the wider butterfly valve range and the corrosion-resistant stainless steel butterfly valve range complete the programme.

Subcategories: DVGW Butterfly Valves by Media and Design

01 AK210G — Wafer Gas Butterfly Valve (DVGW G 260)

The AK210G wafer gas butterfly valve clamps between two counter-flanges to PN6, PN10, PN16 or ANSI Class 150. The GGG40 body carries an epoxy paint finish, the disc is stainless steel 1.4408, and the NBR seat ring meets DVGW Gas to DIN EN 13774 for fuel gases under DVGW-Arbeitsblatt G 260 from −20 °C to +60 °C. Sizes run from DN40 to DN500, and the wafer face-to-face length follows EN 558-1 Series 20.

02 AK211G — Lug Gas Butterfly Valve (DVGW G 260)

The AK211G lug gas butterfly valve carries its own threaded lugs, so each side of the flange pair bolts on independently. This design is the right choice for dead-end service, where the downstream line has to be dismantled without disturbing the upstream flange. The AK211G is available in ductile iron GGG40 with epoxy coating and, for corrosive or coastal environments, in stainless steel CF8M / 1.4408 with an AISI 316 shaft. Both variants share the NBR seat ring and the full DVGW Gas approval.

03 AK210W — Wafer Drinking Water Butterfly Valve (DVGW)

The AK210W wafer drinking water butterfly valve uses an EPDM seat ring approved for potable water under DVGW drinking water certification. The GGG40 body receives an epoxy paint finish in accordance with drinking water requirements, and the disc is either stainless steel 1.4408 or GGG40 coated with Resicoat R4 — a fusion-bonded epoxy specifically approved for cold and warm potable water. Nominal sizes cover DN40 to DN500 at PN10 and PN16.

Materials in Detail: Specifying the Right DVGW Butterfly Valve

Body Materials — GGG40 or Stainless Steel

1. Ductile Iron GGG40 / EN-GJS-400-15 with Epoxy Coating (Standard)

Application: municipal gas grids, biogas installations, drinking water utilities, district heating, general industrial water service — the standard housing across the AK210 and AK211 series

Temperature: gas −20 °C to +60 °C (NBR seat) · drinking water 0 °C to +70 °C (EPDM seat) · PN10 and PN16

Advantages: high toughness and vibration damping, economical for large nominal sizes up to DN500, the epoxy layer protects reliably against atmospheric corrosion, standard body for the vast majority of DVGW installations

Limitations: not suitable for permanently chloride-rich, saline or aggressive chemical media; the coating may be damaged by abrasive solids in the medium

2. Stainless Steel CF8M / 1.4408 (AISI 316) with AISI 316 Shaft

Application: the AK211G is offered in a full stainless steel version for coastal and marine gas installations, industrial gas skids near saline air, chemical process gas systems and any environment where external corrosion of a coated cast iron body would shorten service life

Temperature: gas −10 °C to +90 °C (NBR seat) · PN10

Advantages: the molybdenum content resists pitting from chlorides and salt spray without any coating, no maintenance of the paint finish, hygienic external surface, longer service life in aggressive atmospheres, single-material construction between body, disc and shaft

Limitations: higher material cost than GGG40; specify only where the external or internal environment genuinely justifies stainless steel — for pure inland gas networks, the coated GGG40 body remains the economical standard

Disc Materials

1. Stainless Steel 1.4408 / CF8M (Standard Disc)

Application: standard disc across every AK210 and AK211 variant for gas and drinking water service

Temperature: matches the seat envelope: −20 °C to +60 °C (gas) · 0 °C to +70 °C (water)

Advantages: excellent corrosion resistance against the gas and water media, no metal-ion pickup into drinking water, dimensionally stable under bolt load, hygienic surface

Limitations: higher cost than a coated GGG40 disc — often unnecessary where the medium is neutral drinking water

2. Ductile Iron GGG40 with Resicoat R4 Epoxy Coating (Drinking Water Variant)

Application: economical disc alternative in the AK210W and AK211W drinking water variants for cold and warm potable water

Temperature: 0 °C to +70 °C

Advantages: Resicoat R4 is a fusion-bonded epoxy specifically approved for potable water contact, no metal-water interface, more economical than the stainless steel disc at large nominal sizes

Limitations: coating requires careful handling during installation to avoid mechanical damage; not intended for abrasive or chemically aggressive water

Certificates & Standards for DVGW Butterfly Valves

Fergo DVGW butterfly valves comply with the Pressure Equipment Directive 2014/68/EU and carry the CE mark. Gas versions AK210G and AK211G hold the DVGW Gas approval to DIN EN 13774 for fuel gases under DVGW-Arbeitsblatt G 260. Drinking water versions AK210W and AK211W carry the separate DVGW drinking water approval, with the EPDM seat verified against DVGW-Arbeitsblatt W 270 for microbiological suitability in potable water contact. Flange connections follow EN 1092-1, wafer face-to-face lengths comply with EN 558-1 Series 20, and actuator mounting flanges meet ISO 5211.

Inspection documents to EN 10204 — the type 2.2 works certificate or the type 3.1 inspection certificate — are available on request. A full overview of all certificates is published on the Fergo certificate page. For installations outside the DVGW scope, the broader butterfly valve range covers EPDM, NBR, FKM/Viton and PTFE seats across the same nominal sizes. You can verify seat and body compatibility with your medium beforehand using the Fergo resistance check.

Delivery & Availability

Fergo holds more than 25,000 industrial valves in stock. DVGW butterfly valves in the AK210 wafer and AK211 lug series are available in every nominal size from DN40 to DN500, both in ductile iron GGG40 and — for the AK211G — in stainless steel CF8M. Automation is carried out in-house with a gearbox, a pneumatic actuator or the J4C electric actuator, so a pneumatic DVGW butterfly valve or an electrically actuated version leaves the warehouse fully assembled and tested. A Switchmaster limit switch box provides visual and electrical position feedback for automated packages.

Fergo ships across Europe — including the United Kingdom, the Nordic countries and all other EU member states. Smaller nominal sizes travel by parcel service, whereas large-bore drinking water and gas valves go by forwarding agent. Express shipping delivers within the next working days. You will find shipping costs, payment options and express terms on the shipping and payment terms page. For special sizes, alternative disc coatings or complete automation packages for gas skids and drinking water pumping stations, please contact us through the customised solutions section.