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
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
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.