1. Check the outer surface of the duckbill valve installation pipeline or connecting flange for burrs, deformation, smooth and flat. 2. The installation of the socket type duckbill valve should make the inner diameter of the duckbill valve and the outer diameter of the connected pipe match correctly; the socket depth should meet the relative requirements; the exterior of the pipe can be coated with plumber's seal; rubber gaskets should be added appropriately between the clamp jaws, and then tighten the connecting bolts; if the duckbill valve uses auxiliary liner pipe, when connecting, the auxiliary liner pipe and the reserved pipe should be sealed and welded firmly, and the appropriate increase in strong tendons to improve strength and rigidity. 3. When the nominal diameter is greater than DN800, due to the larger weight of the valve body, coupled with the work, the duckbill valve body ventral cavity has a large amount of water and water impact, must increase a bearing rod, through the duckbill valve body on the lifting ring, the duckbill valve body long-term solid lifting. 4. Please check the working conditions to determine whether the duckbill valve model, installation method, technical parameters, technical requirements (pressure or back pressure, temperature resistance, corrosion resistance conditions) are consistent. 5. Check whether there is any artificial damage inside and outside the duckbill valve, check whether there is any spoil inside the valve, etc. 6. If the valve body is stored for a long time, to prevent open fire. It is strictly prohibited to stack. 7. In normal use, no maintenance is required, but to prevent sharp and hard objects from poking through the valve body.
