Duckbill Check Valve

Description

▪ Duckbill valve is manufactured from rubber or synthetic elastomer, and shaped like the beak of a duck. 

▪ Commonly used in medical applications to prevent contamination due to backflow.

▪ One end of the valve is stretched over the outlet of a supply line, conforming itself to the shape of the line, usually round. The other end, the duckbill, retains its natural flattened shape.

Design

▪ The simple, one-piece “duckbill” sleeve eliminates moving components and intrusive body structures that create problems with conventional check valve designs. 

▪ There are no mechanical parts that can freeze, corrode, bind, or otherwise inhibit smooth operation.

▪ Unlike conventional check and flap gate valves, Duckbill check valve does not require regular maintenance to replace worn seats, hinge pins, balls, or flappers.

Operation

▪ The principal of operation is simple. Upstream pressure in the valve forces the lips or “duckbill” apart to permit flow. 

▪ As pressure or flow increases, the lips open further, allowing more flow. This feature allows solids to pass unhindered with low pressure loss.

▪ When pressure is removed (backpressure or reverse flow), the duckbill end returns to its flattened shape, preventing backflow.

▪ Even with some wear, the “duckbill“ check sleeve will still function including sealing around entrapped solids.

▪ The duckbill valve is similar in function to the mitral valve in the heart

Features

▪ Duckbill Check Valves have low head loss and achieve the tightest possible seal for backflow operations, particularly at low flow rates. 

▪ The flexibility allows the valve to compress around trapped solids, providing a much better seal than flap gates. 

▪ Sleeve design made of quality fabric-reinforced elastomer materials for maximum resistance to corrosion and wear

▪ Valves are not affected by rust, corrosion or UV.   

▪ Maintenance free, have no mechanical components and have a long life span, making it extremely cost effective. 

▪ The check valves operate using line pressure and backpressure to open and close, so no outside energy source is required. 

▪ In use for over 100 years in waterworks and commonly accepted for use in industrial process piping systems and in waste and storm water or sewer piping systems.

Styles and Materials

▪ Duckbill Check Valves are available in multiple styles to be installed in a wide variety of applications 

▪ The “duckbill” fabric-reinforced elastomer choices for compatibility with most fluids include:

▪ Ethylene 

▪ Propylene

▪ Viton

▪ Buna-N

▪ Hypalon,

▪ Butyl

▪ Neoprene

▪ Natural Rubber