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  2. National Board of Boiler and Pressure Vessel Inspectors

    en.wikipedia.org/wiki/National_Board_of_Boiler...

    Pressure-retaining items can be registered with the National Board, requiring certain uniform quality standards be achieved certifying the manufacturing, testing, and inspection process. To obtain a certification the registered items have to be inspected by National Board-commissioned inspectors and built to required standards.

  3. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    Details of furnace and expansion tube from Perkins' 1838 Patent. Perkins' 1832 apparatus distributed water at 200 degrees Celsius (392 °F) through small diameter pipes at high pressure. A crucial invention to make the system viable was the thread screwed joint, that allowed the joint between the pipes to bear a similar pressure to the pipe itself.

  4. Denison Hydraulics - Wikipedia

    en.wikipedia.org/wiki/Denison_Hydraulics

    Denison Hydraulics is a publicly traded U.S.-based company (Stock Symbol:DENHY) that manufactures industrial hydraulic fluid power systems (hydraulic pumps, motors, valves and engineered systems [1]) and components and is headquartered in Marysville, Ohio.

  5. Thermal expansion valve - Wikipedia

    en.wikipedia.org/wiki/Thermal_expansion_valve

    A thermal expansion valve is a key element to a heat pump; this is the cycle that makes air conditioning, or air cooling, possible.A basic refrigeration cycle consists of four major elements: a compressor, a condenser, a metering device and an evaporator.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. 5-ish things to watch in the first round of the College ...

    www.aol.com/5-ish-things-watch-first-110045665.html

    The Buckeyes fanbase is furious at the sixth-year head coach and he’s facing a talented Tennessee team that is expected to bring plenty of fans north to Columbus.