RZNThe RZN has an excellent record of reliability in critical applications where other check valves have failed.
The duo-eccentrically mounted disc is hydrodynamically designed for low pressure loss and freedom from jamming at the seat. The special ADAMS damping system ensures tight and progressive shut-off against reverse flow and offers long service life. The compact design allows installation in confined spaces. All internal screws on ADAMS non-return valves are mechanically locked.
Nominal Diameters: DN 150-1000
Temperature range: from minus 50°С to plus 200°С
Pressure stages: PN 10/16/25/40/64; ANSI 150/300/600


  •  non-return valve with controlled, non-slam closure;
  •  resilient seal or laminated metal-to-metal seal;
  •  triple offset design with inclined conical sealing system;
  •  axial pressure balanced shaft seals for low friction;
  •  adjustable hydraulic damping system, located externally and separated from the media.



  •  complete pump protection;
  •  low flow loss;
  •  progressive sealing system;
  •  damper adjustment locking;
  •  auto-closing;
  •  additional screw safety device;
  •  prepared for retro-fitting of counterweights if flow conditions change.



  •  damping system for opening;
  •  flow control valves;
  •  interlocking system; 
  •  additional counterweight;
  •  without brake cylinder, only with lever;
  •  vulcanized hard rubber coating;
  •  butt weld ends.