duckbill valve 1),Diameter: DN25-DN2400 2),Tpye:slip,flange 3), ISO9001:2000/14001 4), 12 years OEM Service manufacture

How Do Duckbill Check Valves Work?

ZhongHaiWei ®Duckbill Check Valves, widely used in the demanding applications of many industries, are precision-molded, one-piece elastomeric valves that provide reliable backflow prevention at low pressure differentials.  Duckbill check valves allow free flow with positive differential pressure.  With negative differential pressure, backflow is checked.  Pressure drop across the valve is a feature unique to Duckbill Check Valves.  They can be designed to operate in a few millimeters (inches) of water to several hundred kPa (psi), depending on valve size, geometry and compound characteristics.  Duckbill Check Valves are also designed to start functioning at specific opening and closing pressure ranges, depending on your specifications. 

Normally Open one-way check valvesPrevents backflow leakage when minimal backpressure is appliedCan be installed easily into hole and sealed by compressing flange

 

 

Features

 

 

Reliable backflow prevention

 

100% elastomer construction eliminates maintenance

 

Will not corrode, warp or freeze open or shut

 

1”-2” Cracking Pressure, Low Headloss

 

Curved Bill enhances sealing around debris

 

Custom built for each application based on pressure and flow conditions

 

Available in diameters from 1/2" (12mm) to 96” (2400mm)

Flanged Flexible Duckbill Valve