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GEMÜ 490

Butterfly valve with bare shaft

  • Description
  • Features
  • Technical specifications

The GEMÜ 490 PTFE seal butterfly valve has a bare shaft. 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: With bare shaft
  • 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; DN 700; DN 900; DN 1000

Product video

How butterfly valves work

00:27 min
Online since 16.09.2015

Product applications


The sterilization of liquids plays a large role in pharmaceutical and biotechnological production. This is just as important in research and development and in the production of sterile goods as it is in handling parenteral solutions in hospital pharmacies. The hot water cascade system developed by MMM Münchener Medizin Mechanik GmbH enables liquids in closed receptacles made of glass or other temperature resistant materials (such as ampoules) to be sterilized quickly, reliably and gently. The advantage of the hot water cascade system lies in its very short cycle times, which are achieved through a high circulation rate and cascade density in combination with short heating up and cooling down times.