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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pressure vacuum breaker ： ウィキペディア英語版 Pressure vacuum breaker A pressure vacuum breaker (PVB) is a type of backflow prevention device, used to keep non-potable (or contaminated) water from entering the water supply. A PVB is similar to an atmospheric vacuum breaker (AVB), except that the PVB contains a spring-loaded poppet. This makes it acceptable for applications that are high hazard or where valves are downstream. Pressure vacuum breakers must be protected from freezing when installed outdoors. PVBs usually have test cocks, to which specially-calibrated gauges are attached, in order to ensure that they are functioning properly. Backflow prevention devices such as PVBs are regulated by the Uniform Plumbing Code, but may also be required by government regulations. ==See also== * Air gap * Atmospheric vacuum breaker * Chemigation valve * Double check valve * Hydrostatic loop * Reduced Pressure Principle BFP 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pressure vacuum breaker」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.