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  2. Pentair - Wikipedia

    en.wikipedia.org/wiki/Pentair

    Pentair plc (PNR) is an American water treatment company incorporated in Ireland with tax residency in UK, with its main U.S. office in Golden Valley, Minnesota. [5] Pentair was founded in the US, with 65% of company's revenue coming from the US and Canada as of 2017.

  3. Pilot-operated relief valve - Wikipedia

    en.wikipedia.org/wiki/Pilot-operated_relief_valve

    Like other pressure relief valves (PRV), pilot-operated relief valves (PORV) are used for emergency relief during overpressure events (e.g., a tank gets too hot and the expanding fluid increases the pressure to dangerous levels).

  4. 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.

  5. Zone valve - Wikipedia

    en.wikipedia.org/wiki/Zone_valve

    A zone-valved system is dependent upon a single circulator pump. If it fails, the system becomes completely inoperable. The system can be harder to design, requiring both "SPDT" thermostats or relays and the ability of the system to withstand the fault condition whereby all zone valves are closed simultaneously. Zone valves increase the ...

  6. Double check valve - Wikipedia

    en.wikipedia.org/wiki/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 pressure source.

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  8. North West England - Wikipedia

    en.wikipedia.org/wiki/North_West_England

    The Cheshire road system is made up of 3,417 mi (5,499 km) of highway and the principal road (M6) carries 140,000 [55] vehicles in the county daily, linking the North West to the West Midlands. The county town of Chester is served by the A55 , A483 and A494 roads, amongst others.

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