Industriearmaturen Butterfly Valves
Butterfly valves DN25–DN1200 for industry, water & HVAC. GGG40, CF8M, EPDM, NBR & FKM. Buy online now – delivery from 1 working day!
DN25 – DN1200
Nominal diameters
5 +
Materials
4 +
Operation Options
The centric butterfly valve operates with a shaft whose axis of rotation runs through the centre of the pipe bore. The stainless steel CF8M disc seals against the full circumference of the elastomeric seat ring in the closed position. This design is suited for standard shut-off applications up to PN16 at temperatures from –10 °C to +180 °C. The AK200 (wafer) and AK201 (lug with threaded inserts) series cover nominal sizes DN25 to DN1200 to DIN EN 558-1 series 20 face-to-face dimensions.
The double-eccentric butterfly valve offsets the shaft axis from the pipe centre — both horizontally and vertically. This double offset lifts the disc from the seat immediately upon opening and reduces friction wear. The result: higher cycle counts, lower operating torque and suitability for pressures up to PN25 with metallic or RPTFE/INCONEL sealing at temperatures up to +400 °C. The AK210/AK211 series are used primarily in steam lines, power plants and petrochemical processes where centric designs reach their limits.
Regardless of design type, all FERGO butterfly valves are manufactured to DIN EN 593, feature an ISO 5211 mounting flange and comply with the Pressure Equipment Directive 2014/68/EU. Flange connections conform to EN 1092-2 (PN ratings) and ASME B16.5 Class 150.
Wafer and lug butterfly valves in GGG40 and stainless steel CF8M, DN25–DN1200, PN6–PN16. Centric design AK200/AK201 with EPDM, NBR or FKM seat ring for water, air, gases and neutral media. The lug version with threaded inserts allows one-sided pipe disassembly during operation.
Stainless steel butterfly valves with body, disc and shaft in CF8M (1.4408/AISI 316) for corrosive media in the chemical, pharmaceutical and food industries. Temperature range up to +180 °C with FKM seat.
DVGW-certified butterfly valves to DIN EN 13774 for gas distribution networks (NBR seat) and drinking water supply (EPDM seat). AK210G/AK211G (gas) and AK210W/AK211W (drinking water) series, DN50–DN600.
Pneumatic butterfly valves with double-acting (DA) or spring-return single-acting (SR) quarter-turn actuators. Max. operating pressure 8 bar, pilot pressure 6 bar. Fail-safe configurations (NO/NC) for safety-critical processes.
Electric butterfly valves with J4C rotary actuator, multi-voltage 24–240 V AC/DC, IP67. Running times from 13 s (S55) to 35 s (S300) depending on nominal size. Optionally with positioner or battery spring return (BSR).
PTFE butterfly valves with full-face lining for aggressive media — acids, alkalis, solvents and high-purity process fluids. Chemical resistance across a temperature range of –20 °C to +200 °C.
Double-eccentric butterfly valves AK210/AK211 for high-pressure and high-temperature applications up to PN25 and +400 °C. Metallic or RPTFE/INCONEL seats for steam, thermal oil and hot gases. ATEX and TA-Luft compliant.
Vacuum butterfly valves for negative-pressure applications in vacuum technology, degassing and process evacuation. Leakage class suitable for vacuum service.
The standard body is ductile iron GGG40 (EN-GJS-400-15) with epoxy coating — resistant to water, wastewater and moderate chemicals at an economical price point. For corrosive environments, stainless steel CF8M (1.4408/AISI 316) with molybdenum content provides increased resistance to chlorides and acids. Cast steel WCB (1.0619), bronze and aluminium are available as further options. Disc and shaft are supplied in CF8M or AISI 420 as standard.
The seat material determines the application range of a butterfly valve more than any other component. EPDM (–10 °C to +120 °C) suits drinking water, hot water and heating circuits and is required for DVGW drinking water approvals — but it is not resistant to mineral oils. NBR (–10 °C to +80 °C) resists mineral oils, greases and gases and is standard for gas distribution networks. FKM/Viton (–10 °C to +180 °C) covers solvents, fuels and petrochemical media. PTFE offers near-universal chemical resistance for acids, alkalis and high-purity media. RPTFE and INCONEL seats enable use with steam and hot gases up to +400 °C in double-eccentric designs.
Every butterfly valve features an ISO 5211 mounting flange and combines without adapters with hand levers, worm gearboxes, pneumatic quarter-turn actuators or electric actuators. Hand lever operation with a locking segment is practical up to DN300; above that a worm gearbox with handwheel is recommended. For process automation, NAMUR solenoid valves, limit switch boxes for position feedback and positioners for modulating control complete the valve into a full automation assembly.
Butterfly valves with EPDM seats and GGG40 bodies handle isolation of main and branch lines in waterworks, pumping stations and treatment plants. From DN300 upwards the butterfly valve typically replaces the knife gate valve, because weight, installation length and operating torque are significantly lower. Drinking water networks require the DVGW-certified version to DIN EN 13774.
In heating, cooling and ventilation circuits the butterfly valve serves as riser and group isolation. EPDM seats cover hot water up to +120 °C, and the short face-to-face length allows installation in confined plant rooms. Combined with an electric actuator, the valve integrates directly into the building management system.
Aggressive media call for either a CF8M stainless steel body or a PTFE lining. Acids, alkalis and solvents are reliably handled by PTFE, while fuels and hydrocarbons are covered by FKM/Viton up to +180 °C. In hazardous areas, ATEX-compliant actuators to Directive 2014/34/EU are used.
For natural gas and LPG networks, the AK210G and AK211G series are supplied with NBR seats and DVGW approval to DIN EN 13774. The application range runs from DN50 to DN600 at temperatures from –10 °C to +80 °C.
Above +180 °C and PN16 the centric design reaches its limit. Here the double-eccentric butterfly valve operates with metallic or RPTFE/INCONEL seats up to +400 °C and PN25 — in steam lines, thermal oil circuits, boiler plants and flue gas ducts. TA-Luft compliant versions are available.
CF8M stainless steel bodies with EPDM or PTFE seats meet cleanability and media compatibility requirements in CIP circuits, process water lines and filling plants. Pneumatic actuators with a defined fail-safe position secure the process in the event of air supply failure.
All FERGO butterfly valves are manufactured to DIN EN 593 (metallic butterfly valves). Face-to-face dimensions conform to DIN EN 558-1 series 20 (wafer) and series 13 (lug). Flange connections to EN 1092-2 and ASME B16.5 Class 150 allow integration into European and international pipeline systems. DVGW approval to DIN EN 13774 confirms suitability for gas and drinking water networks. ATEX-compliant versions to Directive 2014/34/EU are available for operation in potentially explosive atmospheres. The Pressure Equipment Directive 2014/68/EU is fulfilled across the entire range.
FERGO supplies butterfly valves as individual valves or as configured assemblies with actuator, limit switch box, NAMUR valve and positioner. Stock items ship from one working day. Technical consultation supports the selection of material, seat, nominal size and actuation for your specific application. For custom solutions, project quantities or technical enquiries, the FERGO team is available to assist.
