Butterfly valve Mono Flanged Short - S61 | Alfa Europe - Alfa Europe
Butterfly valve Mono Flanged Short - S61 | Alfa Europe - Alfa Europe

Butterfly valve Mono Flanged Short - S61 | 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 page specifies a range of DN50–DN500, while technical sheets cover versions up to DN600 depending on the actuation type.

Standards and Connection

  • Design: EN 593.
  • Connection: mono / wafer long, bonded liner.
  • Flanges: DIN PN6/10/16/25, ANSI B16.5 Class 150, JIS B2211 5K/10K.
  • Top flange: ISO 5211.
  • Pressure: various classes up to 25 bar.
  • Temperature range: -40 to +250 °C, limited by seat material.
  • Vacuum: up to 1×10⁻³ / 0.2 Torr absolute.

Materials and Sealing

Available bodies: EN-JS1030 ductile iron, ASTM A216 WCB, SS 1.4408, and BS 1400 AB2 aluminum bronze. Discs available in BS 1400 AB2, EN-JS1030, SS 1.4408, or SD 2507. Shafts: SS 1.4122, SS 431, SS 1.4462, or SD F53.

Seats:

  • NBR: -15 to +80 °C
  • EPDM: -23 to +120 °C
  • Viton: 0 to +200 °C
  • Silicone: -40 to +230 °C

Actuation Options

  • Bare shaft: for pneumatic or electric actuator via ISO 5211.
  • Lever operated: DN50–DN200.
  • Gearbox operated: DN50–DN600, for reduced operating torque.

Typical Applications

Suitable for cooling water, HVAC, auxiliary industrial networks, pump stations, low-pressure air, and neutral fluids. For seawater, glycols, chemicals, or elevated temperatures, verify compatibility of disc, shaft, and liner.

FAQ

When to choose S61 over S60?
When installation requires face-to-face Series 16 or replacing an existing mono long valve.

Is it a control valve?
No. It can be used for limited throttling but not for precise continuous regulation without control of differential pressure, velocity, and torque.

Standard (Options)
  • DIN
  • ANSI
  • JIS
Connection (Options)
  • Flanged (Wafer)
Material (Options)
  • EN-JS 1030 (GGG40) Ductile Iron
  • 1.4408
  • ASTM A216 WCB
  • BS 1400 AB2 (Aluminium Bronze)
Pressure Rating (Options)
  • PN 6
  • PN 10
  • PN 16
  • PN 25
Seat (Options)
  • NBR

Datasheet and documents

Description

Range: Size DN50 to DN500

End connection: Mono type long - Bonded liner

Flange connection: DIN PN6-10-16-25 - ANSI B 16.5 Cl. 150# - JIS B 2211 5K, 10K

Temperature range: -40 / + 250 °C

Face to face: acc. EN 558.1 series 16

Certificates

DNV CertificateLloyd's Register Certificate

ABS CertificateCCS Certificate

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