What exactly is a non-return valve? Why are they sometimes referred to as swing check valves?

Where does a Resilient hinge check valve fit in?

The terminology surrounding swing check valves can be confusing. With so many different names for essentially the same product; a valve specifically designed to prevent back-flow in water and wastewater applications, it seemed sensible to produce a short blog post explaining the difference between these valve types.

Non-Return valves for water applications

Swing check valve water applications

Non-Return Valves, NRV’s, Reflux Valves and Check Valves all have a common functionality but are known by a variety of terminology.

A Non-Return Valve is specifically designed to prevent the back flow or reverse flow of a liquid or gaseous media and to protect the pump from the damaging surge pressures of water hammer following pump shut-down.

Different types of Non-return valves

These valves come in various forms including;

  • Swing check valves (with options for springs, weight, levers and guards)
  • Flap check valves
  • Duckbill check valves
  • Dual Disc check valves
  • Tilted Disc check valves
  • Silent check valves
  • Nozzle check valves
  • Ball check valves
  • And now – Resilient Hinge Check Valves.

Resilient hinge check valves

Val-Matic Swing-Flex Check Valve

The valve type ‘Resilient Hinge Check Valve ‘ is a new addition within WIMES and is described as;

A combined hinge and disc of moulded elastomer, steel reinforced but fully encapsulated with integral drop-tight O-ring, 45° seat and 35° stroke.

It operates faster than a Ball or Swing Check with or without the facility to speed up closure and was originally designed to work clog-free in the vertical.

With the only moving part guaranteed for 25 years, the Resilient Hinge Check Valve is ideal for ‘fit and forget’ applications within a typical Sewage Pumping Station or handling sludge in a Treatment Works.