The EVR duckbill check valve is a oneway, non-return
check valve. No additional energy source is required as
they use existing line pressure and back pressure to open
and close the valve. The Duck-Bill design is engineered
such that the valve will always return to a fully closed
position enabling a tight seal, even on suspended solids.
They are extremely suitable for effluent diffuser systems,
wastewater treatment, and storm water and wastewater
back flow prevention.
These have absolutely no maintenance, with no springs,
flaps, seats and seals and will not freeze, warp, rust or
malfunction, because they are built from a one piece
elastomeric construction and can operate at low flow
rates with a low head loss The duckbill check valves are
available from 50mm to 3000mm in various designs and models