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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.

  • The modular actuator system permits a variety of options to be used such as tank bottom valves, T valves, sampling valves, multi-port valves and tandem welded configurations
  • Optional flow direction and installation position
  • Connection: Clamp; Flange; Spigot; Threaded socket; Threaded spigot
  • Actuator: Pneumatic
  • ATEX
  • Explosion protection
  • Body material: 1.4408, PFA lined; 1.4408, investment casting; 1.4435, forged body; 1.4435, investment casting; 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
  • 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

Fitting Accessories

Product video

How diaphragm valves with metal valve bodies work

00:29 min
3687 Views
Online since 16.09.2015
Multi-port valve blocks: Generation of ultra-pure water - Ion exchanger, reverse osmosis and electrodeionization

Product applications

Multi-port valve blocks: Generation of ultra-pure water - Ion exchanger, reverse osmosis and electrodeionization

As a world leading manufacturer of complex multi-port diaphragm valves made of stainless steel, GEMÜ has earned an excellent reputation in the Biotech and Pharmaceuticals markets. The skills and experience that GEMÜ has gained are now transferred to industrial applications and the company now designs and manufactures multi-port valve blocks from plastic materials. Combining the subprocesses of softening by ion exchange, reverse osmosis and electrodeionization is considered today to be an established procedure for generating pure and ultra pure water in the pharmaceutical industry. BWT Pharma & Biotech GmbH OSMOTRON PRO 1800 HPW‘s pure water treatment plant unites these three treatment steps in one system.

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.

Product news

07.10.2015

SIL assessment of GEMÜ products

Together with the independent testing organization EXIDA, GEMÜ has assessed a selection of different products in accordance with SIL.