GEMÜ 687

Pneumatically operated diaphragm valve

  • Technical specifications
  • Accessories
  • Connection: Clamp; Flange; Spigot; Threaded connection
  • Actuator: Pneumatic
  • Seal material
  • Body material: 1.4408, investment casting material; 1.4408, investment casting material, PFA lined; 1.4435 (316L), forged material; 1.4435, investment casting material; EN-GJS-400-18-LT (GGG 40.3), PFA lined; EN-GJS-400-18-LT (GGG 40.3), PP lined; EN-GJS-400-18-LT, hard rubber lined
  • Conformities: 3A; Belgaqua; CRN; EAC; FDA; Functional safety; Oxygen; Reg. (EU) No. 10/2011; Regulation (EC) No. 1935/2004; TA Luft (German Clean Air Act); USP
  • Max. operating pressure: 10 bar
  • Max. media temperature: 100 ° C
  • Min. media temperature: -10 ° C
  • Nominal sizes: DN 10 (3/8''); DN 12; DN 15 (1/2''); DN 20 (3/4''); DN 25 (1''); DN 32 (1 1/4''); DN 40 (1 1/2''); DN 50 (2''); DN 65 (2 1/2''); DN 80 (3''); DN 100 (4'')
  • Pilot valve
  • Control valve
  • Sterilisation temperature: max. 150 °C

Fitting Accessories

Product video

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Equipment for separating liquid mixtures

Product applications

There are various reasons for separating liquid mixtures or for changing their ratio of mixture. Pervaporation/steam permeation (membrane filtration) enables the separation of water / solvent mixtures, the separation of liquids with similar boiling points, the dehydration of multicomponent mixtures, the displacement of equilibrium in reactions where water is released and the dehydration of organic compounds. The complete system consists of an evaporator and a membrane module. lf the liquid to be separated is a distillation product, the steam can be directly passed into the membrane module. In this application the mixture is composed of water with maximum 5 % alcohol. The equipment is located in an 'ex' area.

Product news

09.04.2018

New tutorials on replacing two-piece diaphragms

The GEMÜ training team has already published a number of videos in recent years on specific content such as replacing wearing parts.