SPECIFICATION ITEM:
Supply of rubber backflow preventer valve for gravity pipelines, flanged series. The inlet section must be equal to the pipeline section and must taper to a duckbill shape to allow flow in one direction only. The flexible body must be constructed of a single piece of rubber with non-woven fabric reinforcement.
The valve must meet the following characteristics:
Internal diameter of the line pipe: Of …………..…. mm
External diameter of the line pipe: De ………….…. mm
UNI PN series coupling flange ……………
line pipe in …………………….………. (PVC, HDPE, steel, cement, fibre cement, stoneware, etc.)
location: ………………………… (in the cockpit, outdoors, in the riverbed, underwater, etc.)
minimum and maximum upstream pressure: ………………….
closing back pressure: ………………….
