The Norval check valve range is an industry standard for non-return valves. Most pipeline systems require some form of check valve device to maintain flow in one direction to prevent either contamination of liquids already in the system or damage to the pipework and its ancillary components. Quite a simple function you might think! Experience however tells us a different story.

What are the check valve features that the piping engineer is looking for?

  • Tight shut off under minimum back pressure.
  • Quick response to no-flow or reverse flow conditions.
  • Low resistance to forward flow.
  • Lightweight construction.
  • Ease of installation with unskilled operators .
  • No maintenance.
  • It is a stop silent valve.
  • It stops the reverse flow and is completely silent in its operation, preventing "water hammer".

The Norval Non-Return Check Valve has all these features plus one or two less obvious benefits.

  • It is extremely simple.
  • It operates in any direction, vertically up or down, or horizontal.
  • High material specification - 316 stainless steel.
  • Less noise due to slamming shut under reverse flow.
  • Can be incorporated in a variety of body configurations or simply built into original equipment as a cone and diaphragm assembly.

Product and Types

  • Check Valves
  • Non-Return
  • Anti-Slam Backflow Prevention
  • Diaphragm Valve
  • CIP Valve
  • Clean In Process
  • Large Size Check Valves
  • Foot Valve
  • Stainless Steel Check Valve
  • Marine Valve
  • Stop Silent
  • Strainers
  • Wafer Check Valves
  • Compact Valves
  • Swing Check
  • Disc Type

Norval Non-Return Check Valve Method of Operation

Flow takes place in the direction of the arrows under forward and reverse flow.

A - Check Valve Open

B - Check Valve Closed

C - Check Valve Diaphragm

D - Check Valve Cone

swf file

With flow in the forward direction the diaphragm deflects inwards (A) allowing easy passage of the liquid with little pressure loss. When a no flow, or back pressure, condition occurs the diaphragm returns to its relaxed position (B) sealing off all flow in the reverse direction.

This action is unaffected by the orientation of the Norval Non Return Check Valve.

Stop Silent is a registered trademark of Northvale Korting.


  • Air conditioning
  • Chemical production plants
  • CIP (Clean in Process)
  • Compressors
  • Cooling water systems
  • Filtration plants
  • Fire equipment
  • Food industry
  • Foot-operated valves
  • Ground water pumps
  • Heating systems
  • Hydrants
  • Irrigation plants
  • Petrochemical installations
  • Pneumatic systems
  • Pressure air installations
  • Pumping applications
  • Sanitary facilities
  • Ventilation systems
  • Washing machines
  • Water gauge installation
  • Water meters & flow meters
  • Water treatment