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Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.
Backflow preventers are categorized into three groupings: Assembly, Device or Method. With the exception of elimination, these are the only ways one can control backflow from taking place. The eight named backflow assemblies all have two resilient seated isolation/shut off valves with properly located test ports.
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.
Backflow is a term in plumbing for an unwanted flow of water in the reverse direction. [1] It can be a serious health risk for the contamination of potable water supplies with foul water . In the most obvious case, a toilet flush cistern and its water supply must be isolated from the toilet bowl.
Wilkins is the leader in most years with the Hawks, 12 seasons, the most games played in Hawks franchise history, with 882, the most minutes played with 32,545, the most career points with 23,292, and the most points per game, with 26.4 points per game. [citation needed] Wilkins led the NBA in scoring in the 1985–86 season. [3]
Elk v. Wilkins, 112 U.S. 94 (1884), was a United States Supreme Court landmark 1884 decision [1] [2] with respect to the citizenship status of Indians. [3]John Elk, a Winnebago Indian, was born on an Indian reservation within the territorial bounds of United States.
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