GEMÜ 428

Motorized butterfly valve

  • Description
  • Features
  • Technical specifications
  • Accessories

The GEMÜ 428 soft seated butterfly valve made from stainless steel or brass is motorized. A manual override and an optical position indicator are integrated as standard. With its rounded and polished disc edges, the butterfly valve is optimized for frequent cycle duties. The surface of the butterfly valve can be further finished.

  • Suitable for vacuum applications and low temperatures
  • High-quality butterfly valve made from stainless steel or brass
  • Available in small nominal sizes
  • Compact and robust body
  • Media temperature :-20 to 120 °C
  • Ambient temperature:-10 to 60 °C
  • Operating pressure :0 to 10 bar
  • Nominal sizes:DN 15 to 50
  • Connection types:Clamp | Spigot | Threaded connection
  • Connection standards:ASME | DIN | EN | ISO | SMS
  • Housing materials:1.4408, investment casting material | CW614N, brass | CW617N, brass
  • Liner materials:EPDM | FKM | Silicone
  • Disc materials:1.4408, investment casting material | CW614N, brass | CW617N, brass
  • Supply voltage:100 - 120 V AC, 50/60 Hz | 12 - 24 V AC/DC | 220 - 240 V AC, 50/60 Hz | 380 - 480 V AC, 50/60 Hz
  • Operating time 90°:4 to 100 s
  • Protection class:IP 65, 66, 67, 68
  • Conformities:CSA | EAC | FDA

Fitting Accessories

Product video

How butterfly valves work

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Online since 16.09.2015
Dosing station for dyeing auxiliaries

Product applications

Dosing station for dyeing auxiliaries

Indigo belongs to the group known as vat dyes. These dyes are typified by the fact that they do not form a chemical compound with the yarn, instead adhering to its surface as a surrounding pigment. Hydrosulphite (dithionite) is used as an auxiliary material when dying cotton with indigo (e.g. denim). It turns the water-insoluble blue colour indigo into a water soluble light-yellow leucoindigo (indigo white). This process is referred to as vatting.