WHAT IS A NON RETURN VALVE DRAIN FLAP?

A non return valve was originally developed to prevent back flow of water to prevent flooding and drainage issues. Non return valves come in all sizes from small back flow valves for domestic water supply to large flaps for preventing overflow in lakes and water outlets which drain into the sea and rivers.

Originally developed 7 years ago in plastic design we started to see plastic valves in 110mm formats for protection against back flow and rat control. These valves certainly made an impact and soon pest control companies and drainage firms started to use these plastic valves in sewers and drains.

Over time several companies started producing metal valves and rat flaps these valves are stainless steel in design and are designed to be push fitted into place. These valves come under various names including Ratblockers, Ratbarrier, Rat Flap, Drain Flap and 110mm non return valves but all do the same thing and follow the same principle allowing water to flow and escape but prevent return of rodents.

WHEN SHOULD YOU USE ONE?

You should use a Non return valve whenever you have a problem with rodents in your property. We would advise that you call in a pest control company or drain company who can inspect your sewer pipes for breaks or uncapped pipes.

We would always advise that you try to repair the breaks but understand that this cannot always be done due to various factors. The non return valves drain flaps can be installed after the drain survey if you feel this is the best option and they provide a semi/permanent solution. Valves should always be checked once per year to ensure smooth operation.

HOW DO YOU FIT THEM?

Non return valves are very easy to fit most including ours are pushfit in design but some require tightening poles to fit into place. Sometimes it maybe required to do some chiseling to the outlet or repointing if the outlet is curved.

ANY OTHER TIPS?

Drains and sewers are messy places and rat are notorious for carrying disease so please ensure when working in sewers you wear rubber nitrile gloves and wear suitable face protection. If in doubt call a qualified pest control professional or drainage expert.