The Rubber Duckbill Check Valve is an exceptionally reliable and cost-effective method of controlling back pressures in sewage treatment plants, stormwater outfall, effluent discharge, flood control and wet wells. They are fully passive flow devices that require no maintenance and operate on differential pressure with no external energy source. They do not corrode, warp or freeze and can be installed on pre-existing pipelines or grey infrastructure with minimal pipe work modifications.
Rubber Duckbill Valves prevent the backflow of wastewater from contaminating clean water supplies by preventing discharges from a sewage plant from entering the municipal sewer system. They also help to prevent flooding, standing water, and potentially harmful phenomena such as water hammer.
These simple, robust valves are an ideal alternative to conventional flap gate valves that are known to rust, malfunction and seize. Unlike these, they are constructed of reinforced rubber that is able to handle large obstructions without jamming or binding.
Their flexibility allows them to open with very little head pressure, always providing maximum flow with minimal pressure drop across the valve. They can also seal around trapped or suspended solids with minimum backpressure. The finest of engineering elastomers are used, and the outer layers are designed to repel marine organisms.
Compared to mechanical disc and ball valves, rubber duckbill check valve are relatively easy to maintain, requiring only minor measures such as lubricating the valve components. However, they do not have the same lifespan as these types of valves and as a result they will need to be replaced at some point in their service life.
When choosing a check valve it is important to consider several factors including the type of fluid being managed, the line size and direction, the maximum leakage rate and pressure drop as well as any special requirements. In addition, the valve should be properly assembled, installed and maintained if water hammer, reverse flow, leakage or damage are to be avoided.
In-Line Rubber Duckbill Check Valves are a unique, innovative, and highly effective check valve that is being specified widely in many municipal pumping applications throughout the US. These low headloss inline rubber check valves use a single piece vulcanised elastomeric matrix consisting of numerous natural and synthetic elastomers with ply reinforcement, similar to a truck tyre.
They are a great alternative to conventional flap and swing check valves because they do not have metal components that can rust, bind or seize. They are also more robust and can withstand corrosive materials and other abrasives in the liquid being managed.
These valves are extremely easy to install and assemble, making them a cost-effective choice for many types of projects. They are available in a wide range of sizes and can be flanged or slip on to pipework at the customer’s discretion.
During installation it is important to keep the rubber duckbill check valve in a vertical position so that the opening will be in a vertical up and down position when the valve is opened or closed. For a flanged inline duckbill check valve, it is also essential to ensure the headwall or pipe flange is the same spec as the rubber duckbill check valve. This ensures that the rubber flange will act as a gasket between the mating flanges to prevent rotation when the valve is bolted up.