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  2. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow. In water distribution systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture. Water pressure may fail or be reduced when a water main bursts, pipes freeze ...

  3. Reduced pressure zone device - Wikipedia

    en.wikipedia.org/wiki/Reduced_pressure_zone_device

    A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs may also be known as reduced pressure principle (RP), reduced pressure principle backflow prevention devices, [1][2] reduced pressure zone assemblies (RPZA), [3] or reduced pressure principle ...

  4. Business Japanese Proficiency Test - Wikipedia

    en.wikipedia.org/wiki/Business_Japanese...

    The Business Japanese Proficiency Test (BJT) (ビジネス日本語能力テスト, Bijinesu Nihongo Nōryoku Tesuto) is a Japanese language proficiency test designed to objectively measure a person's practical communicative skills in communicating and responding to information in a Japanese-language business environment. Unlike its counterpart ...

  5. Backflow - Wikipedia

    en.wikipedia.org/wiki/Backflow

    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. For this reason, building codes mandate a series ...

  6. File:Meishi-example.svg - Wikipedia

    en.wikipedia.org/wiki/File:Meishi-example.svg

    File:Meishi-example.svg. Size of this PNG preview of this SVG file: 520 × 320 pixels. Other resolutions: 320 × 197 pixels | 640 × 394 pixels | 1,024 × 630 pixels | 1,280 × 788 pixels | 2,560 × 1,575 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.

  7. Double check valve - Wikipedia

    en.wikipedia.org/wiki/Double_check_valve

    Double check valve. 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 ...

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