The combined function valve GBZ/AZI

Multifunction operation

The combined function valve GBZ/AZI developed from RZN and RZI basic types provide multifunction operation as tight shutoff, flow control, and non-return valves in a single, compact unit. They can take the place of shutoff and check valves and fulfill multiple application requirements most economically.

The isolating and control actuator operates through a free travel coupling so that the freeacting hydraulically damped disc can close automatically without slamming, if the pump should fail.


  • Multi-function
  • Compact design
  • Minimum pressure loss
  • Stable operation
  • Controlled, non-slam closure
  • Additional screw safety device
  • Prepared for retro-fitting of counterweights if flow conditions change


  • Wide choice of actuators and control systems
  • Disc locking device, mansafe design
  • Additional counterweight
  • Vulcanized hard rubber coating
  • Butt weld ends
  • AZI: complete hydraulic unit

Features of the combined function valve GBZ/AZI

  • 3 in 1 combination valve for tight shut-off, control, and non-return function in one compact unit
  • Resilient seal or laminated metal-to-metal sealing – triple offset design with inclined conical sealing system
  • Auto-closing
  • Minimum pressure loss in open position
  • GBZ: multirate adjustable hydraulic damping system, located externally and separated from the media
  • AZI: multi-rate adjustable interval damping system


ADAMS Product range