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  2. National Board of Boiler and Pressure Vessel Inspectors

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

    Accredited repair organizations qualify to stamp the National Board VR symbol on repair nameplates. [ 3 ] The National Board lab supports industry research and development by testing new designs, serving as a comparative standard for other laboratories, validating new concepts, and – upon jurisdiction request – assist in boiler and pressure ...

  3. Pilot-operated relief valve - Wikipedia

    en.wikipedia.org/wiki/Pilot-operated_relief_valve

    The control pilot opens either to the main valve exhaust pipe or to atmosphere. Snap acting At set pressure the valve snaps to full lift. This can be quite violent on large pipes with significant pressure. The pressure has to drop below the set pressure in order for the piston to reseat (see blowdown in relief valve article). Modulating

  4. Valve audio amplifier technical specification - Wikipedia

    en.wikipedia.org/wiki/Valve_audio_amplifier...

    The typical valve using this topology in (rare) current commercial production is the 300B, which yields about 5 watts in SE mode. Rare amplifiers of this type use valves such as the 211 or 845, capable of about 18 watts. These valves are bright emitter transmitting valves, and have thoriated tungsten filaments which glow like light bulbs when ...

  5. Watt steam engine - Wikipedia

    en.wikipedia.org/wiki/Watt_steam_engine

    Watt realised that the heat needed to warm the cylinder could be saved by adding a separate condensing cylinder. After the power cylinder was filled with steam, a valve was opened to the secondary cylinder, allowing the steam to flow into it and be condensed, which drew the steam from the main cylinder causing the power stroke.

  6. 989 Studios - Wikipedia

    en.wikipedia.org/wiki/989_Studios

    The 989 Sports name developed from a long history of name changes and corporate shuffling within Sony centered around operations in Foster City, California.In August 1995, the video game business of Sony Imagesoft was merged with the product development branch of SCEA, becoming Sony Interactive Studios America (SISA) [1] In 1998, SISA was spun off from SCEA and was renamed 989 Studios.

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