Backflow Prevention Valves (non-return valves) effectively secure any rooms located on the lower floors against flooding caused by back flow of storm water and sewage. This valve also prevents backflow into rainwater or storage tanks. It is fully automatic with no external power supply required. Back flow may be caused by intense rains, thaw or floods. BS8515 recommends the use of backflow prevention valves for underground rainwater systems.
The flap's protecting guard as well as all mounting elements (screws, nuts and washers) are made of chromium-nickel stainless steel type 0H 18N9.
The shape of the protecting guard and gasket has been designed to protect against damage of the gasket by rodents and sliding during sewage flow.
Backflow Prevention Valves are equipped with a manual closure lever. It enables protection against unpleasant smells in case of longer breaks in household sanitary system use.Flood damage can be very expensive. Prevention is far more cost-effective. These economically priced EN certified valves prevent backflow into residential and commercial premises via drain systems, toilets or sewers.
The backflow valves can be installed in horizontal sewage pipes within the building or in manholes/ access chambers outside the building.
The face-plates' guard and gasket are designed to protect against damage by rodents and block their entry.
They have a smooth interior surface to prevent any sediment collection and to ensure smooth flow.
The valves feature a locking lever to manually close the valves in both directions. To service, the stainless steel screws are simply removed giving access to the flap and gasket.
Liquid temperatures up to 95 degrees are suitable.