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Interior view of a turbomolecular pump. A turbomolecular pump is a type of vacuum pump, superficially similar to a turbopump, used to obtain and maintain high vacuum. [1] [2] These pumps work on the principle that gas molecules can be given momentum in a desired direction by repeated collision with a moving solid surface.
Hitachi Construction Machinery Co., Ltd. was established in 1970, and was involved in the production of Japan's first mechanical excavator.The company has now become a major construction equipment manufacturer in the world, and it is listed on the Nikkei 225.
Hitachi, Ltd. [nb 1] (Japanese pronunciation: [çi̥taꜜtɕi]) is a Japanese multinational conglomerate founded in 1910 and headquartered in Chiyoda, Tokyo.The company is active in a range of industries, including digital systems, power and renewable energy, railway systems, healthcare products, and financial systems. [4]
Torr-Seal, or its generic equivalent Hysol-1C (US brand name) or Loctite 9492 (EU brand name), is an epoxy with resin and hardener for use in vacuum environments. It will begin to degrade at high temperatures but otherwise is very stable with very little outgassing. Other vacuum-rated epoxies are also available.
External vacuum sealers involve a bag being attached to the vacuum-sealing machine externally. The machine will remove the air and seal the bag, which is all done outside the machine. A heat sealer is often used to seal the pack. Typically these units use a dry piston vacuum pump which is often considered a "maintenance-free" pump.
The joint venture with Hitachi yielded Fiat-Hitachi and Fiatallis construction machinery branding for different markets until 2002 when Hitachi terminated the agreement. After Fiat S.p.A. purchased Case Corporation in 1999 and formed CNH , they eventually retired the Fiatallis brand within a few years in their remaining markets and merged the ...