New Generation Diaphragm Valve


The new Generation Diaphragm Valve of GF Piping System sets new standards regarding safety, efficiency and simplicity.

Instead of the commonly used four metal screws, it has a central union nut. This non-corrosive connection is characterized by homogeneous temperature behavior, even surface pressure and high pressure rating up to 240 PSI (for water use only).

The optimal flow geometry offers double the Cv values. With almost linear flow characteristics, this guarantees stable processes.

The weir of the zero-static valve has been moved directly to the pipe wall of the main line. Therefore, dead leg was reduced to an absolute minimum, and thus, purity was increased at the same time.

Standard equipment, like a lockable handwheel, a two-colored indicator, and an interface for a self-adjusting limit switch, set new standards in terms of user-friendliness.

Product Overview

Technical Data:

  • Size Range:
  • ½" - 2"

Pressure Rating:

  • 240 PSI for SYGEF® Standard, SYGEF® Plus, PVC special configuration (for water use only)
  • 150 PSI for PVC, CPVC, ABS, PROGEF® Standard, PROGEF® Natural

Joining Technology:

  • Type 514: Unions with Solvent Cement Sockets, Threaded Sockets, Fusion Sockets, Butt Fusion Spigots
  • Type 515: Socket Fusion Spigots, Butt Fusion Spigots
  • Type 517: Flanges, Loose Flanges
  • Type 519: Butt Fusion Spigots

Standard Ratings:

  • ANSI
  • ASTM
  • BS
  • ISO
  • JIS


  • Polyvinyl Chloride (PVC)
  • Chlorinated Polyvinyl Chloride (CPVC)
  • Acrylonitrile-Butadiene-Styrene (ABS)
  • PROGEF® Standard (PP-H)
  • PROGEF® Natural (PP-n)
  • SYGEF® Standard (PVDF)
  • SYGEF® Plus (PVDF)


  • EPDM
  • PTFE
  • FPM
  • NBR
  • IIR


  • Multifunctional module with electrical feedback

* depending on the end connection, the nominal pressure reduces to 150 PSI

Fields of Application:

  • Chemical Process Industry
  • Life Sciences
  • Microelectronics
  • Water Treatment
  • Food and Beverage
  • Measurement and Control
  • Applications with high viscosity and solid content


  • Corrosion-resistant and high pressure rating
  • High efficiency due to doubled Cv value, linear flow characteristics
  • Smallest possible dead legs
  • User friendliness due to lockable handwheel and two color indicator
  • Wide selection of material for best chemical resistance
  • Flow in either direction irrespective of installation position
  • Integrated fixation system with stainless steel mounting inserts
  • Suitable for slurries and abrasive media




  • Self-adjusting electrical feedback
  • Pneumatically actuated version available, see DIASTAR