Lepakkoläppäventtiilit

Lepakkoläppäventtiilit, also known as duckbill valves, are a type of check valve designed to prevent backflow. They are characterized by their flexible, flap-like structure that opens under forward pressure and closes when the pressure is reversed. This unique design makes them suitable for applications where solids or debris might be present, as they are less prone to clogging than traditional poppet or swing check valves.

The name "lepakkoläppäventtiili" or "duckbill valve" comes from the resemblance of the valve's open state to the bill of a duck. They are typically made from rubber or other elastomeric materials, which allows for their self-closing action and resistance to corrosion. The valve body is usually a rigid housing that connects to the piping system, while the flexible duckbill portion extends from this housing.

These valves find common use in wastewater treatment plants, storm drains, sewage systems, and flood control applications. Their ability to operate with low head loss and their self-cleaning properties are significant advantages. They are particularly effective in preventing the ingress of tidal water or sewage backup into lower-lying areas. The simple design also contributes to their reliability and low maintenance requirements. Installation is straightforward, often involving insertion into a pipe or flanged connection. The material selection is crucial for ensuring longevity and compatibility with the fluid being handled.