SPECIFICATION ITEM:
Supply of a fluid-actuated rubber backflow preventer valve with a female connector sized to fit on the outside of the pipeline. The inlet section must be equal to the pipeline section and must taper to a duckbill shape to allow flow to pass in one direction only. The flexible body must be constructed of a single piece of rubber with non-woven fabric reinforcement. The valve will be supplied with suitable stainless steel fastening clamps. The valve must meet the following characteristics:
internal diameter of pipe: Of ….…. mm
external diameter of pipe: De ……… mm
pipes in ……. (PVC, HDPE, steel, cement, fiber cement, stoneware)
location: ……. (well, outdoors, in the riverbed, underwater, etc.)
minimum and maximum upstream pressure: …………….. m H20
closing back pressure:…………. m H20