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  2. Backwashing (water treatment) - Wikipedia

    en.wikipedia.org/wiki/Backwashing_(water_treatment)

    Water to be filtered is then applied to the filter surface until the filter clogs and the backwash cycle needs to be repeated. [3]: 264–8 [4]: 10.53–10.58 [5]: 937–9 [6]: 8.11–8.18 [7]: 353–6 Some water treatment filters use surface wash systems that break up the heavily clogged, granular media surface layer.

  3. Upflow anaerobic sludge blanket digestion - Wikipedia

    en.wikipedia.org/wiki/Upflow_anaerobic_sludge...

    Upflow anaerobic sludge blanket (UASB) technology, normally referred to as UASB reactor, is a form of anaerobic digester that is used for wastewater treatment.. The UASB reactor is a methanogenic (methane-producing) digester that evolved from the anaerobic clarigester.

  4. Pentair - Wikipedia

    en.wikipedia.org/wiki/Pentair

    Pentair was founded in August 1966 as Pentair Industries, Inc., with the name derived from the Greek root word "penta-" (alluding to the company's five founders) and "air" (alluding to the company's original product), and went public several months later. [10] The 5 founders were all formally employed by Litton Industries. [11]

  5. Relief valve - Wikipedia

    en.wikipedia.org/wiki/Relief_valve

    A relief valve DN25 on cooling water pipe from heat exchanger Schematic diagram of a conventional spring-loaded pressure relief valve. A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; excessive pressure might otherwise build up and create a process upset, instrument or equipment failure, explosion, or fire.

  6. Backwash - Wikipedia

    en.wikipedia.org/wiki/Backwash

    Backwash ileitis, the involvement of the terminal part of the ileum in ulcerative colitis, following the ascent of the condition from the rectum Backwashing (water treatment) , the process of thoroughly cleaning a pool filter pump by reversing the flow of water through it with the dirt and rinse water going to waste

  7. Rapid sand filter - Wikipedia

    en.wikipedia.org/wiki/Rapid_sand_filter

    Rapid sand filters use relatively coarse sand (0.5 to 1.0 mm) and other granular media, such as anthracite, in beds of 0.6 to 1.2 metre depth to remove particles and impurities that have been trapped in a floc through the use of flocculation chemicals—typically alum. Since media other than silica sand can be used in such filters, a more ...

  8. Hackworth valve gear - Wikipedia

    en.wikipedia.org/wiki/Hackworth_valve_gear

    The Hackworth valve gear is a design of valve gear used to regulate the flow of steam to the pistons in steam engines. It is a radial gear , with an actuating lever driven from the crank. The drive may be taken directly from the crank or indirectly via a return crank (as in all pictures).

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