Butterfly Valves

Butterfly valves are used for isolation and, under controlled conditions, flow throttling in water networks, HVAC, chilled water, air, inert gases, steam, thermal oil circuits, and general industrial utility services. Quarter-turn operation provides short face-to-face dimensions and lower installed mass compared with gate or globe valves, but valve selection should account for differential pressure (Δp), disc opening angle, Kvs/Cv, operating torque, and potential seat–disc wear.

The category includes wafer, lug, flanged, double-flanged, double-offset, triple-offset, high-performance, and food-grade designs. Wafer valves are installed between mating flanges and are used mainly for inline isolation. Lugged bodies with threaded inserts can be used as pipe-end valves and allow one side of the pipeline to be disconnected without removing the valve. Flanged and double-flanged constructions are selected where higher mechanical rigidity or a specific installation standard is required.

In soft-seated designs, seat materials such as EPDM, NBR, and FPM cover different temperature limits and chemical compatibility requirements, typically in PN 6, PN 10, and PN 16 ductile iron bodies. Tightness can be verified to EN 12266-1. For potable water or gas service, compliance with the relevant approvals and material certifications should be confirmed before specification.

For steam, thermal oil, elevated temperature duty, or fire-safe requirements, double-offset and triple-offset butterfly valves are generally specified. Double-offset designs reduce disc-to-seat friction during opening and are available with PTFE+C or metal seats for higher temperature service. Triple-offset metal-seated valves are applied in steam systems, thermal cycling duty, and process lines where elastomeric seats are not acceptable. Typical options include PN 6 to PN 40 pressure classes, fire-safe execution, ATEX, SIL, TA-Luft / ISO 15848 fugitive emission compliance, and manual, pneumatic, electric, or hydraulic actuation.

Wafer

Lug

Flanged

Double Offset

Triple Offset

High Performance

Sanitary

Butterfly valve - ZESA | ARI

Ari-Armaturen

ARI-ZESA® Wafer Butterfly Valve The ARI-ZESA® is a soft-sealing wafer-type butterfly valve with elongated centering holes for installation between EN 1092-1 flanges. It is primarily used as an isolation valve in water networks, HVAC, cooling systems, industrial utilities, and process air applications. Technical Specifications Nominal Diameters: DN 25–600...

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Butterfly valve - GESA | ARI

Ari-Armaturen

ARI-GESA® Lug Butterfly Valve The ARI-GESA® is a soft-sealing lug-type butterfly valve with threaded holes in the body. This design allows for installation between flanges, use as a pipe-end valve, and disconnection of one side of the pipeline, which is not possible in the same way with a typical wafer configuration. Technical Specifications...

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Butterfly valve - ZIVA Z | ARI

Ari-Armaturen

ARI-ZIVA®-Z Wafer Butterfly Valve The ARI-ZIVA®-Z is a soft-sealing wafer-type butterfly valve designed for installation between DIN EN 1092-1 flanges. It is primarily intended for line isolation and simple on/off operation in industrial water networks, HVAC, compressed air, natural gas, and auxiliary supplies. Technical Specifications Type: ARI-ZIVA®-Z,...

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Butterfly valve - ZIVA G | ARI

Ari-Armaturen

ARI-ZIVA®-G Lug Butterfly Valve The ARI-ZIVA®-G is a soft-sealing lug-type butterfly valve with threaded lugs on the body. It is used for isolation or flow restriction of liquids and gases in industrial networks, water circuits, HVAC, air, inert gases, and general utility applications. The lug design allows for use as a pipe-end valve and disconnection of...

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Butterfly valve triple offset - ZETRIX 016 | ARI

Ari-Armaturen

ARI-ZETRIX® 016 Triple Offset Butterfly Valve The ARI-ZETRIX® 016 is a double-flanged process valve with triple offset and metal sealing. It serves as an isolation valve in steam lines, thermal circuits, industrial gases, and processes where elastomeric seats are unsuitable due to temperature, pressure, or fire-safe requirements. Technical Specifications...

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Butterfly valve triple offset - ZETRIX 016 ANSI | ARI

Ari-Armaturen

ARI-ZETRIX® 016 ANSI Triple-Offset Butterfly Valve The ARI-ZETRIX® 016 ANSI is a triple-offset double-flanged butterfly valve with metal sealing, designed for isolation in process lines with ANSI flanges. The triple offset allows 90° rotation with limited friction between the disc and seat, suitable for steam, thermal cycles, and frequent open/close...

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Butterfly valve triple offset - ZETRIX 018 | ARI

Ari-Armaturen

ARI-ZETRIX® 018 Triple Offset Butterfly Valve The ARI-ZETRIX® 018 is a fully lugged / threaded flanged triple offset butterfly valve with metal sealing. The threaded hole connection allows for lug-type mechanical retention, suitable for industrial lines requiring robust flanged installation and the ability to isolate network sections. Technical...

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Butterfly valve triple offset - ZETRIX 018 ANSI | ARI

Ari-Armaturen

ARI-ZETRIX® 018 ANSI Triple Offset Butterfly Valve The ARI-ZETRIX® 018 ANSI is a fully lugged / threaded flanged triple offset butterfly valve with metal sealing. Designed for ANSI flanged connections and lug-type mechanical retention, it primarily serves as an on/off isolation valve in process lines. Technical Specifications Type: ARI-ZETRIX® ANSI Fig....

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Butterfly valve triple offset - ZETRIX 019 | ARI

Ari-Armaturen

ARI-ZETRIX® 019 Triple Offset Butterfly Valve The ARI-ZETRIX® 019 is a butt-weld ended process valve with triple offset and metal sealing. It is selected for integration into piping systems via welding, without flanges, suitable for steam lines, hot fluids, process, or energy applications. The triple offset design allows 90° rotation with minimal friction...

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Butterfly valve triple offset - ZETRIX 019 ANSI | ARI

Ari-Armaturen

Triple Offset Butterfly Valve ARI-ZETRIX® 019 ANSI The ARI-ZETRIX® 019 ANSI is a butt-weld ended process valve with triple offset design and metal sealing. It is intended for permanent welded installation in ANSI pipelines where avoiding flanged connections is preferred due to temperature, pressure, or sealing requirements. Technical Specifications Type:...

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Butterfly valve double offset - ZEDOX 120 | ARI

Ari-Armaturen

ARI-ZEDOX® 120 Double Eccentric Butterfly Valve The ARI-ZEDOX® 120 is a high-performance wafer-type double eccentric butterfly valve designed for industrial isolation in liquid, gas, and steam lines where compact installation and controlled wear at the seat/disk interface are required. The 90° movement and eccentricity remove the disk from the seat...

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Butterfly valve double offset - ZEDOX 121 | ARI

Ari-Armaturen

ARI-ZEDOX® 121 Double Eccentric Butterfly Valve The ARI-ZEDOX® 121 is a double eccentric butterfly valve with butt-weld ends, not wafer or lug. It is selected for lines where flanged connections are not required, and the valve needs permanent integration into the piping network. The rotation is 90°, and the double eccentricity reduces disc/seat friction...

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Butterfly valve double offset - ZEDOX 123 | ARI

Ari-Armaturen

ARI-ZEDOX® 123 Double Eccentric Butterfly Valve The ARI-ZEDOX® 123 is a high-performance double eccentric butterfly valve with a flanged connection type thread connection / threaded holes. It is designed for isolation in industrial liquid, gas, and steam lines where compact construction length and mechanical strength greater than a conventional...

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Butterfly valve double offset - ZEDOX 122 | ARI

Ari-Armaturen

ARI-ZEDOX® 122 Double Eccentric Butterfly Valve The ARI-ZEDOX® 122 is a double-flanged high performance butterfly valve with double eccentricity, designed for flanged installation in industrial pipelines. The 90° movement and eccentricity reduce disc/seat friction during opening, crucial for higher pressures, steam, and thermal cycles. Technical...

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Butterfly valve JIS Short Double Flanged - S36 | Alfa Europe

Alfa Europe

Flanged Butterfly Valve JIS Alfa Europe S36 The S36 is a short double flanged butterfly valve with a bonded liner, designed for pipelines with JIS B 2211 5K / 10K flanges. It covers DN50–DN1000, with face-to-face dimensions according to JIS F-7480, primarily used in marine auxiliary isolation flow networks. Technical Specifications Design: EN 593...

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Butterfly valve Flanged - S46 | Alfa Europe

Alfa Europe

The S46 is a concentric butterfly valve double flanged with a bonded liner, designed for industrial piping systems requiring a fully flanged connection instead of wafer or lug. It covers DN40–DN1200, designed to EN 593 and face-to-face EN 558-1 Series 13. Standards and Operational Limits Flanges: DIN PN6/10/16/25, ANSI B16.5 Class 150, JIS B2211 5K/10K....

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Butterfly valve - S52 | Alfa Europe

Alfa Europe

Butterfly Valve Wafer Alfa Europe S52 The S52 is a wafer-type butterfly valve designed for isolation or basic throttling in industrial water networks, HVAC, cooling, treated water, air, and neutral liquids. It is installed between flanges and covers sizes DN40–DN600, with nominal pressures up to PN16 depending on size and flange connection. Standards and...

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Butterfly valve - S52A & S62A | Alfa Europe

Alfa Europe

Alfa Europe S52A / S62A Butterfly Valve The S52A / S62A series consists of central disc butterfly valves made from fully austenitic stainless steel, featuring a replaceable seat. Available in wafer and lug versions for installation between flanges in industrial flow isolation networks. Sizes range from DN40 to DN600, designed according to EN 593 and...

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Butterfly valve - S57 | Alfa Europe

Alfa Europe

Butterfly Valve Wafer Alfa Europe S57 The S57 is a marine/industrial wafer-type butterfly valve with a bonded liner, designed for installation between flanges in flow isolation lines. It covers DN40–DN1200, face-to-face according to EN 558-1 Series 20, and design EN 593. Flange connections cover DIN PN6/10/16/25, ANSI B16.5 Class 150,...

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Butterfly valve - S59 (PTFE) | Alfa Europe

Alfa Europe

Butterfly Valve Wafer Alfa Europe S59 PTFE The S59 is a wafer-type butterfly valve with PTFE lining, designed for lines where the chemical compatibility of an elastomeric liner is insufficient. It is primarily used as an isolation valve in industrial chemical networks, treated water systems, acidic/alkaline solutions, and processes requiring low adhesion...

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Butterfly valve Mono Flanged Short - S60 | Alfa Europe

Alfa Europe

Mono-Flanged Short Butterfly Valve Alfa Europe S60 The S60 is a mono short/wafer type butterfly valve with a bonded liner, designed for installation between flanges in industrial isolation networks. It covers DN50–DN1000, designed according to EN 593 and face-to-face according to EN 558-1 Series 20. Available flange connections include DIN PN6/10/16/25,...

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Butterfly valve Mono Flanged Short - S61 | Alfa Europe

Alfa Europe

Mono-Flanged Long Butterfly Valve Alfa Europe S61 The S61 is a mono type long butterfly valve with a bonded liner, designed for installation between flanges in industrial flow isolation networks. Compared to the S60 short version, it features a longer face-to-face dimension: EN 558-1 Series 16, a critical factor for replacing existing valves. The product...

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Butterfly valve - S62 | Alfa Europe

Alfa Europe

Butterfly Valve Lug Alfa Europe S62 The S62 is a concentric lug-type butterfly valve designed for installation between flanges in industrial isolation networks. The lug construction allows for bolted connection to the flange and should be selected when mechanical retention of the valve is crucial for maintenance or line section isolation. The actual...

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Butterfly valve - S64 | Alfa Europe

Alfa Europe

Butterfly Valve Lug Alfa Europe S64 The S64 is a butterfly valve with a lug / double flanged pattern and bonded liner, designed for maritime and industrial flow isolation networks. It covers DN40–DN1200, designed according to EN 593 and face-to-face EN 558-1 Series 20. Connection standards include DIN PN6/10/16/25, ANSI B16.5 Class 150, and JIS B2211...

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