GEMÜ 687

Pneumatically operated diaphragm valve

  • Description
  • Features
  • Technical specifications
  • Accessories

The GEMÜ 687 2/2-way diaphragm valve has a low maintenance plastic membrane actuator and is pneumatically operated. The valve has a metal distance piece. Normally Closed (NC), Normally Open (NO) and Double Acting (DA) control functions are available.

  • Hermetic separation between medium and actuator
  • CIP/SIP capable
  • Wide range of adaptation options for add-on components and accessories
  • Suitable for particulate and abrasive media
  • Stainless steel body suitable for corrosive environments
  • Wide range of adaptation options for add-on components and accessories
  • Media temperature: -10 to 100 °C
  • Sterilization temperature: Max. 150 °C
  • Ambient temperature*: 0 to 60 °C
  • Operating pressure*: 0 to 10 bar
  • Nominal sizes*: DN 10 to 100
  • Body configurations:
  • Connection types: Clamp | Flange | Spigot | Threaded connection
  • Connection standards:
  • Body materials: 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
  • Diaphragm materials: EPDM | FKM | PTFE
  • Conformities*: 3A | CRN | EAC | FDA | Oxygen | Reg. (EU) No. 10/2011 | Regulation (EC) No. 1935/2004 | SIL | TA Luft (German Clean Air Act) | USP

Fitting Accessories

Product video

Diaphragm replacement for GEMÜ 687 with diaphragm code 5E

05:56 min
Online since 04.04.2018
Equipment for separating liquid mixtures

Product applications

Equipment for separating liquid mixtures

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


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.