What is the difference between non-return check valves and resilient hinge check valves?
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.
Get the latest process industry news
Interested in receiving even more industry-leading news from Process Industry Forum delivered directly to your inbox? Then sign up to our free newsletter. Bringing you the latest news, trends, innovations and opinion from across the process industry, our exclusive newsletter gives you all the industry insights of the moment in one, easy-to-digest bulletin. Stay ahead of the competition with regular process industry news instalments from PIF.