DVGW Butterfly Valves for Gas & Water

DVGW-approved butterfly valves for gas and drinking water applications – safe, compliant, and reliable for supply networks

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Zwischenflansch und Anflansch Absperrklappen

Fergo Butterfly Valves

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Stainless Steel Butterfly Valves

Electric Butterfly Valves

Pneumatic Butterfly Valves

Absperrklappen mit pneumatischem und elektrischem Antriebwir liefern Ihnen die automatisierte Absperrklappen in verschiedenen Größen von DN 25 - DN 1200 mit elektronischen oder pneumatischen Antrieben. Bis DN30

PTFE Absperrklappen für Aggressive Medium

PTFE Butterfly Valves

Butterfly Valves Gearbox

Doppelexzentrische Absperrklappe aus Edelstahl – metallisch dichtend für anspruchsvolle Industrieanwendungen

Double-eccentric Butterfly Valves

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Butterfly Valves for Gas: Natural Gas, Methane, Biogas – Each in a Class of Its Own

Gas is not simply 'gas'. Whether it's natural gas, methane, biogas, or something else – each medium tests the material, seals, and design. The DVGW-certified butterfly valve for gas is designed precisely for this.

In practice, models with NBR (Nitrile) sealing liners are noticeably often used here, as they are specifically made for gas applications. They remain leak-tight – even when pressure and temperature fluctuate. Typical pressure ratings like PN10/16 or ASME Class 150 easily cover most industrial networks.

There are also long-established DVGW-tested solutions for newer topics like biogas or gaseous methane. This gives planners and operators clear certainty – for today and later.

Potable Water Butterfly Valves: Hygiene is Not Up for Debate

When it comes to potable water, mere functionality is not enough. Trust plays the main role. Butterfly valves for potable water must be made of materials that do not affect the water, do not leach substances, and remain stable in the long term.

EPDM seals are usually employed here, combined with coated cast iron housings or stainless steel variants. Particularly in aggressive environments or under special hygiene requirements, stainless steel is almost always the safe choice.

The DVGW approval guarantees that these components comply with strict hygiene regulations – a point that is crucial not only during commissioning but also repeatedly during ongoing operation.

Variants, Actuators, Materials – Practical and Flexible

A DVGW butterfly valve is not an off-the-shelf standard product. It can be adapted: as a wafer type, with threaded holes, manual or automated, electrically or pneumatically actuated – the selection adapts to the respective system, not the other way around.

It's similar with materials: Cast iron is suitable for classic applications, stainless steel for more demanding conditions. This variety is not a luxury but simply part of everyday pipeline life.

Safety Without Compromise – DVGW Sets the Standard

Whether for gas or potable water: A DVGW-approved butterfly valve is not a formality. It stands for genuine safety awareness, quality, and responsibility. This makes commissioning less complicated, builds trust in operation, and ensures the technology works reliably even after years.

In other words: Those who rely on DVGW for gas and potable water aren't necessarily making things easy for themselves, but they are definitely doing it right.

Frequently Asked Questions – Butterfly Valves

FERGO carries a comprehensive range of butterfly valves to cover virtually every industrial and building services application. The main subcategories are:

Fergo Butterfly Valves – Standard wafer and lug butterfly valves (AK200/AK201) in ductile iron GGG40 with stainless steel disc, available in EPDM, NBR, FKM/FPM, and PTFE seat materials, DN25 to DN1200, PN6/10/16 and ANSI Class 150.
Stainless Steel Butterfly Valves – Full stainless steel body and disc for corrosive media, food, pharmaceutical, and outdoor applications.
DVGW Butterfly Valves – Certified valves for potable water (W270) and natural gas applications, fully compliant with German and European standards.
Electric Butterfly Valves – Automated valves with electric actuators for PLC integration, remote control, and building management systems.
Pneumatic Butterfly Valves – Fast-acting automated valves with pneumatic actuators, including ATEX-rated options for hazardous areas, DN25 to DN1200.
PTFE Butterfly Valves – PTFE-lined valves for aggressive acids, alkalis, solvents, and high-purity processes.
Butterfly Valves with Gearbox – Manual handwheel operation for larger nominal sizes where lever operation is not practical.
Double-eccentric Butterfly Valves – High-performance valves with metal sealing for higher pressures, temperatures, and demanding process applications.

Both designs mount between pipe flanges, but they do it differently. A wafer butterfly valve is clamped between two flanges using long through-bolts that pass through both flanges and the valve body. It is the more compact and economical choice and is ideal when you always want to isolate a full pipe section. A lug butterfly valve has threaded inserts (lugs) cast into its body. Each side of the pipeline bolts directly and independently into these lugs. This allows one side of the pipeline to be disconnected and removed while the other side remains pressurised – a configuration known as dead-end service. If you need maintenance flexibility or plan to work on sections of pipe without a full system shutdown, lug design is the better option. FERGO offers both designs across all its standard butterfly valve ranges.

The seat or liner is the heart of the butterfly valve – it is in direct contact with your medium and determines chemical compatibility and temperature limits. Here is a quick guide:

EPDM – The all-rounder for water, hot water, steam, and mild chemicals. Resistant up to approx. 120 °C. Widely used in HVAC and building services. Not suitable for mineral oils.
NBR (Nitrile) – Designed for mineral oil-based media such as hydraulic oil, fuels, and cooling lubricants. Good resistance to aliphatic hydrocarbons. Not recommended for hot water or steam.
FKM / FPM (Viton®) – Excellent resistance to a wide range of aggressive chemicals, oils, and elevated temperatures. Suitable for more demanding industrial process applications.
PTFE (Teflon®) – Near-universal chemical resistance. The first choice for aggressive acids, alkalis, and solvents. Also available as a full PTFE-lined valve – see PTFE Butterfly Valves.

If you are unsure, the FERGO team is happy to advise on media compatibility for your specific application.

Yes – if your application involves natural gas, liquefied petroleum gas (propane/butane), or potable drinking water, you are legally required to use valves that carry the relevant DVGW certification. FERGO's DVGW Butterfly Valves hold approvals under DVGW Gas (DIN EN 13774) and DVGW Drinking Water (W270), ensuring full compliance with German and European safety and material standards. These certified valves are available in both wafer and lug design, from DN25 to DN300, with PN6 to PN16 pressure ratings, and can be equipped with hand levers, gearboxes, electric actuators, or pneumatic actuators.

A centric (concentric) butterfly valve has its disc shaft running directly through the centre of the disc and the seat. When the disc closes, it rubs against the seat along the full rotation, which leads to some wear over time. This design is cost-effective and perfectly suitable for standard industrial and building services applications at moderate pressures and temperatures. A double-eccentric (double-offset) butterfly valve has its shaft positioned with two offsets from the disc and seat centreline. This means the disc lifts cleanly away from the seat almost immediately on opening, and seats with a cam-like action on closing – resulting in virtually no rubbing wear. This gives significantly longer service life, better suitability for higher pressures and temperatures, and a tight metal-to-metal seal. FERGO's Double-eccentric Butterfly Valves are the right choice for demanding process engineering, power generation, shipbuilding, and applications where long-term tightness is critical.

Both allow the valve to be operated automatically without manual intervention, but they differ in speed, power source, and ideal use case:

Electric Butterfly Valves – Powered by mains electricity (24V, 230V, 240V). They offer precise positioning, easy integration into PLC and building management systems via control signals (0–10V, 4–20mA), and clear position feedback. The ideal choice for building automation, Industry 4.0 environments, and applications requiring modulating control. See Electric Butterfly Valves.
Pneumatic Butterfly Valves – Powered by compressed air. They are extremely fast-acting and powerful, making them the preferred choice for quick-cycling processes, emergency shut-down systems, and hazardous (ATEX/Ex) areas where electrical equipment is restricted. Available in single-acting (spring-return, fail-safe) and double-acting variants. See Pneumatic Butterfly Valves.

If compressed air infrastructure is already in place and speed or ATEX compliance matters, pneumatic is the better fit. For smart building integration and precision control, electric actuation is the right choice.

FERGO butterfly valves cover a very wide range of nominal sizes from DN25 (1") up to DN1200 (48"). Available pressure ratings (PN classes) include PN6, PN10, PN16, and ANSI/ASME Class 150, making them compatible with both DIN and imperial flange standards. Sizes and pressure ratings available depend on the specific subcategory – for example, standard Fergo Butterfly Valves and Pneumatic Butterfly Valves cover the full DN25–DN1200 range, while DVGW-certified valves are available from DN25 to DN300. Use the product configurator on this page to filter by nominal width, connection standard, and pressure class to find your exact match.

Ductile iron (GGG40) with epoxy coating is the standard body material for most industrial butterfly valves – it is highly robust, cost-effective, and suitable for the vast majority of water, air, and neutral media applications. You should upgrade to a Stainless Steel Butterfly Valve when your application involves one or more of the following:

Corrosive or aggressive process media that would attack iron over time
Food, beverage, or pharmaceutical processes where hygiene standards and material compliance are required
Outdoor or marine environments where the valve body is exposed to corrosive atmospheres or seawater
High-purity applications where iron contamination of the medium is not acceptable

Stainless steel bodies (typically 1.4408 / AISI 316) offer significantly better corrosion resistance and a longer service life in these conditions, while maintaining the same compact, space-saving design.

Butterfly Valves for Gas and Potable Water: Why DVGW Approval Makes the Difference

DVGW is More Than Just a Test Seal