Check valves
Check valves, also called non-return valves, allow fluids to flow in a single direction. You can find them at the outlet of the hydraulic system, where fluid return has to be avoided, no matter whether domestic hot water, air, or industrial, discharge and drainage liquids. Check valves work automatically and according to the difference in pressure between the section upstream and downstream of the stem.
Available types of check valve
The valves can be spring loaded, disc, ball, wafer disc, double disc wafer, swing, wafer swing and foot flanged according to the closing system. They can be made of AISI 304 and AISI 316 steel, brass, cast iron and plastic. The stainless steel check valves produced by Mondeo – Idrja, Small, Glovalve and Floy – guarantee contained load loss and better system efficiency thanks to their special shape.
Check valve applications
Check valves cover a wide range of applications: working pressures from 6 bar to 350 bar and temperatures from -25 to +250 °C. Their versatility makes them perfect for various applications. They are suitable for both industrial and domestic use, in water and industrial liquid treatment plants, in pump groups for civil and industrial water, for compressed air, liquid waste and sewers.
Frequently Asked Questions
Where should a check valve be installed?
One of the most common applications is downstream of the pump, to prevent backflow of the fluid. It is also useful in cases of significant elevation differences, as it blocks the weight of the water column that would otherwise place stress on the pump and piping. At discharge manifolds, it helps maintain stable and predictable flow rates on each line. It is important to remember that during installation, the flow direction must always be respected, as indicated by an arrow on the valve body.
What is the difference between a check valve and a non-return valve?
These terms refer to the same product, namely a valve that allows fluid to flow in only one direction, automatically closing when the flow reverses.