GEMÜ 428

Motorized butterfly valve

  • Technical specifications
  • Connection: Clamp; Spigot; Threaded connection
  • Actuator: Motorized
  • Seal material
  • Body material: 1.4408, investment casting material; CW614N, brass; CW617N, brass
  • Conformities: ATEX; EAC; FDA
  • Max. operating pressure: 10 bar
  • Max. media temperature: 120 ° C
  • Min. media temperature: -20 ° C
  • Nominal sizes: DN 15 (1/2''); DN 20 (3/4''); DN 25 (1''); DN 32 (1 1/4''); DN 40 (1 1/2''); DN 50 (2'')

Product video

Videotutorial: Modifying to an pneumatic NO NC actuator

03:32 min
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Online since 03.11.2021
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Dosing station for dyeing auxiliaries
Further applications

Product applications

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.