Flanged Duckbill Check Valve(2"-14") Supply Range is From 50mm to 350mm Connected with Ring Flange, the Material can be Stainless Steel/Cast Iron/Forged Steel Rubber can be NR/NBR/EPDM/NEOPRENE for your option Cost-effective and Maintenance Free Backflow Prevention Automatically Most Professional Mamufacturer From China.

Flanged Duckbill Valves(2"-14")

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. 

Flanged duckbill check valve DV-XH41A Features:

Easy installation with ring flange, drilling can be DIN/JIS/EN/ANSI

Reliable backflow prevention

100% elastomeric construction eliminates maintenance

Will not corrode, warp or freeze open or shut

1”-2” Cracking Pressure, Low Head loss

Custom built for each application based on pressure and flow conditions

Available in diameters from 1/2" (12mm) to 14"