GEMU Model 653 Industrial Diaphragm Valve


The GEMU 653 manually operated 2/2-way metal diaphragm valve has a stainless steel bonnet and is available in two versions – GEMU 653 has a handwheel in high temperature and chemically resistant plasticl. The handwheel is non-rising and has a standard optical position indicator. Two bonnet versions are available: for 2/2-way bodies and for T-bodies or multi-port bodies.


  • Suitable for inert, corrosive, liquid and gaseous media
  • CIP/SIP cleaning and sterilizing capabilities
  • Autoclave capability
  • Insensitive to particulate media
  • Surface finishes down to 0.25 μm, electropolished
  • Designed according to GMP (Good Manufacturing Practice)
  • The handwheel design allows minimal heat sink thus reducing the danger of burns injuries
  • The service life of the diaphragm is increased to a maximum by the patented optional seal adjuster (US-patent 6,691,737 B2)
  • Optional flow direction, will seal in either flow direction up to full operating pressure
  • Optional mounting position
  • Option
    • Lockable handwheel
    • Mounting for proximity switches for position feedback




Nominal Sizes: 1/2″3/4″1″1-1/2″2″3″, 4″

Connection Type: 125# Flat Face Flange, 150# Flat Face Flange, 150# Raised Face Flange Serated, 150# Raised Face Flange Smooth, Flanged ANSI class 125/150 RF – length EN 558-2 Series 1, ISO 5752 Basic Series 1, Schedule 40 Socket Weld, Threaded NPT

Valve Body Material: 316 Stainless Steel with PFA Lined BodyCast Iron – ASTM A-126 Class B Body, Ductile Iron with Butyl Lined Body, Ductile Iron with Hard Rubber Lined Body, Ductile Iron with Hypalon Lined Body, Ductile Iron with Neoprene Lined Body, Ductile Iron with PFA Lined Body, Ductile Iron with Polypropylene Lined Body, Ductile Iron with PVDF Lined Body, Ductile Iron with Silica Free Soft Rubber Lined Body, Ductile Iron with Tefzel Lined Body, Investment Cast 316 Stainless Steel Body

Diaphragm Material: Buna-N, Butyl, EPDM, Hypalon, Natural Rubber Silica Free, Neoprene, PTFE/EPDM, PTFE/Viton, TFM/EPDM, TFM/Viton, Viton

Control Function: Manually Operated