GBZ/AZIThese combination valves 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.
Nominal Diameters: DN 100-800 (GBZ); DN 500-3000 (AZI)
Temperature range: from minus 50°С to plus 200°С
Pressure stages: PN 2,5/6/10/16/25/40; ANSI 150/300



  •  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.



  •  multi-function;
  •  compact design;
  •  minimum pressure loss;
  •  flow turbulence absence;
  •  noise-free, controlled and smooth closing;
  •  damping or brake system, externally controlled, as well as in operating mode;
  •  additional screw safety device;
  •  prepared for retro-fitting of counterweights if flow conditions change;
  •  with possibility of further equipping with electric pneumatic drive.



  •  wide choice of actuators and control systems;
  •  interlocking system;
  •  additional counterweight;
  •  vulcanized hard rubber coating;
  •  butt weld ends;
  •  AZI: complete hydraulic unit.