Axial Nozzle Check Valve


Check valves are used in numerous installations for various purposes and it is always a challenge for the planning engineer to find suitable return flow preventers. Often it does not become evident until a plant is being run on test that the selected non return valves slam heavily and produce high pressure peaks which exceed the permissible pressure to such an extent that the installation and the surroundings are endangered. A further important factor in the present and future is economy (the savings of energy).

A feature of the Samson Ringo Axial Flow Check Valves is its inherent non slam characteristic. This is achieved because the valve reacts so quickly to flow changes. This causes that the valve change the point of closure without letting any possible reverse flow. This avoid water hammer effect for liquid service and ensures no chance of reverse flow into the compressor for gas service.

Additional benefits of the Samson Ringo Axial Flow Check Valves design are:

  • Low pressure drop and turbulence due to the streamlined flow path.
  • Extremely long service life because the moving parts are not subjected to the shocks associated with typical asymmetric valve designs.
  • The valve has no soft parts to wear, cause misalignment, or need replacing.

Design characteristics range


Design options

Samson Ringo offers to its customers two different design of the Axial Flow Check Valves:

Solid disc design

This is the design commonly used for valves below 12″.


Ring disc design

In this design, typically used for sizes 14″ and above, main advantages are the low friction, quick response and low pressure loss.




  • Carbon Steel : A216-WCB/WCC.
  • Cr-Mo Alloy Steel : A217-WC6, A217-WC9.
  • Cr-Mo-V Alloy Steel : A217-C12A.
  • Nickel based alloys, Hastelloy, Inconel; Monel. Titanium.


  • Martensitic : A217 Gr, CA15.
  • Austenitic: A351 Gr, CF8/CF8M.
  • Stainless steel 18% Cr: A351-CF8M, A351-CF8C
  • Cr + Ni Stainless steels: Alloy 20, A351-CK3MCuN
  • Duplex A890-Gr. 4A, Super Duplex A890-Gr. 6A
  • Nickel based alloys, Hastelloy, Inconel; Monel Titanium.

Cladding and overlays

  • Stellite: Hardness HRC 45 RC & Maximum working temperature 500oC.
  • Tungsten carbide: Hardness HRC 74 RC & Maximum working temperature 550oC.


Axial Nozzle Check Valve Technical Bulletin