GEMU's websites make use of cookies. If you are using the site, this means that you agree to the use of cookies. To implement personal settings, click here

GEMÜ 491

Pneumatically operated butterfly valve

  • Description
  • Features
  • Technical specifications

Die GEMÜ 491 PTFE seal butterfly valve has a metal actuator and is pneumatically operated. The disc and shaft are one piece; the body and liner are available in different designs. The butterfly valve is available in nominal sizes DN 40–900 (1½"–36") and in wafer and lug body versions.

  • Suitable for isolating and control functions with gaseous and liquid media
  • Seal material TFM™ (FDA 21CRF 177.1550)
  • Installation length acc. to ISO 5752/20, EN 558-1/20, JIS 10K
  • ATEX version available as an option
  • TA-Luft compliant
  • Extensive applications using a variety of materials
  • Connection: Flange
  • Actuator: Pneumatic
  • ATEX
  • Explosion protection
  • Body material: 1.4301, stainless steel; EN-GJS-400-18-LT; S355J2G3 steel
  • Max. operating pressure: 10 bar
  • Max. media temperature: 200 ° C
  • Min. media temperature: -20 ° C
  • Nominal sizes: DN 40 (1 1/2''); DN 50 (2''); DN 65 (2 1/2''); DN 80 (3''); DN 100 (4''); DN 125 (5''); DN 150 (6''); DN 200; DN 250; DN 300; DN 350; DN 400; DN 450; DN 500; DN 600

Product video

Butterfly valve for controlling corrosive media: GEMÜ 490

01:37 min
631 Views
Online since 02.09.2015
Innovative methods for freeze-drying pharmaceutical products

Product applications

Innovative methods for freeze-drying pharmaceutical products

Many pharmaceutical manufacturing procedures are based on bio-technological processes. Often, their molecular structure is extremely complex and their liquid form is unstable, which is why many bio-pharmaceuticals cannot be stored directly. Freeze-drying is the gentlest procedure for conserving the active ingredient solution. Because of critical operating conditions the butterfly valve GEMÜ 490 is particularly important.