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GEMÜ 688

Pneumatically operated diaphragm valve

  • Description
  • Features
  • Technical specifications
  • Accessories

The GEMÜ 688 2/2-way diaphragm valve has a two-stage actuator and is pneumatically operated. The actuator has a stainless steel housing and is controlled by two pistons working independently of each other. A stroke limiter is integrated as standard.

  • Optional flow direction and installation position
  • It is possible to query the OPEN and CLOSED position via proximity switches
  • CIP/SIP capable
  • Hermetic separation between medium and actuator
  • Additional part stroke adjustment facility
  • Extensive range of accessories
  • Connection: Clamp; Flange; Spigot; Threaded socket; Threaded spigot
  • Actuator: Pneumatic
  • ATEX
  • Explosion protection
  • Body material: 1.4408, investment casting; 1.4435, forged body; 1.4435, investment casting
  • Max. operating pressure: 10 bar
  • Max. media temperature: 100 ° C
  • Min. media temperature: -10 ° C
  • Nominal sizes: DN 15 (1/2''); DN 20 (3/4''); DN 25 (1''); DN 32 (1 1/4''); DN 40 (1 1/2''); DN 50 (2'')

Fitting Accessories

Product video

How diaphragm valves with metal valve bodies work

00:29 min
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Online since 16.09.2015
Production plant for liquids

Product applications

Production plant for liquids

The plant is used for manufacturing liquid pharmaceutical products and consists of raw material supply, preparation and mixing of liquids and cleaning. 3 tanks are available for the preparation of liquids (2 x 1000 l and 1 x 2000 l). The tanks are pressure and vacuum resistant from -1 bar to +3 bar. Each tank is equipped with a separate heating/cooling system. The prepared products are mixed in 3 different mixing tanks with a contents of 2000 l each or in movable containers. The plant is designed according to GMP and qualified.