• 1. Usage range:
  

  Mainly used in infra-structure pipelines, sewage discharge systems, drain system, and  pump systems;

  
  

  2.Charicteristics:

       A. Structure: Ploarized rubber+hard steel wire

       B. No need for electrical or pneumatic operation signals, no manual operation, no noise

　　　C. The new curved  nozzle increases the sealing area, improves sealing performance, is not clogged, has no faults, and does not require maintenance.

       D. Low opening pressure improves the flow capacity of the pipeline；

　　 E. Long service life, up to 10-30 years, easy to install;

3.Material:

     Natural rubber, CR, EPDM, NBR, FKM;

4.Function:

    When the internal pressure of the pipeline is higher than the outside pressure of the duckbill valve, the valve opens and begins to drain. When the outside pressure of the valve is higher than the internal pressure of the pipeline, the valve automatically closes to prevent backflow;

5.Installation:

Installed at the outlet end of the pipeline with flange connection, it can be directly connected to the pipeline flange or wall.