Febco backflow preventor
Water backflow prevention device is used to protect water supplies from contamination or pollution. In water supply systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower etc. When pressure fails or is reduced as may happen if a water main bursts, pipes freeze or there is unexpectedly high demand on the water system, the pressure in the pipe may be reduced and may allow contaminated water from the ground, from storage of from other sources to be drawn into the system. To prevent such an occurrence, many regulatory regimes require there to be an air gap between the delivery point of mains water and local storage or use 1.Where submerged mains inflow is permitted a backflow prevention device is required. In this way backflow prevention device protects the potable system from contamination hazards which can be severe. There are over 10,000 reported cases of backflow contamination each year. Some cases can be fatal. In many countries where regulations allow for the possibility of backflow , backflow prevention devices are required by law and must be installed in accordance with plumbing or building codes. A typical backflow assembly has test cocks and shut-off valves and must be tested each year, if relocated or repaired, and when installed. In the United States, the Environmental Protection Agency (EPA) holds local water suppliers responsible for maintaining a certain amount of purity in potable water systems. Many states and/or local municipalities require annual testing of backflow prevention assemblies. A check valve is a common form of backflow prevention