The GEMU 312/314 pneumatically operated 3/2-way valves have a rugged low maintenance aluminium piston actuator.
GEMU 312 is flanged, GEMU 314 has threaded sockets. The connection for the control medium can be rotated through 360°. The double sided valve plug is connected to the actuator via a spindle. The valve spindle is sealed by a self-adjusting gland packing providing low maintenance and reliable valve spindle sealing even after a long service life. A wiper ring fitted in front of the gland packing protects the seal against contamination and damage.

  • Suitable for inert liquid and gaseous media
  • Control medium: inert gases
  • Suitable for high working medium temperatures
  • Materials of wetted parts can be selected to suit relevant applications
  • With GEMU 312 and GEMU 314 valves control processes which normally require two separate valves can be combined, for example: mixing, separating, aerating and de-aerating
  • Extensive range of accessories
  • Simple adaptation for use as a control valve


Note Please click "Magnifying Glass" next to the attributes listed below to view helpful information.
Type 312 314
Nominal Size 100 15 20 25 32 40 50 65 80
Body Configuration Multi-port
Connection Flanges ANSI class 125/150 RF length EN 558-2, series 1, ISO 5752, basic series 1 (GEMO 312) Flenges EN 1092 / PN 10/16 / form B length EN 558-1, series 1, ISO 5752, basic series 1, (GEMU 312) Threaded sockets DIN ISO 228 (GEMU 314)
Valve Body Material EN-GJL-250, (GG 25) Cast iron Rg 5 Cast bronze
Seat Seal PTFE
Control Function Normally closed
Actuator Size
Actuator 1 piston Ø70 mm Actuator 2 piston Ø120 mm

Working Medium

Working Medium Inert, gaseous and liquid media which have no negative impact on the physical and chemical properties of the body and seal material.
Max. Perm. Pressure of Working Medium 16 bar
Max. Perm. Temperature of Working Medium 180 ºC

Control Medium

Control Medium Inert Gases
Max. Control Pressure 7 bar
Max. Perm. Temperature of Control Medium 80 ºC
Filling Volume 0.125 dm3 (for Actuator Ø 70) 0.625 dm3 (for Actuator Ø 120)