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This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. Many industrial, military or otherwise professional tubes were also produced.
Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme. Special quality variants may have the letter "S" appended, or the device description letters may be swapped with the numerals (e.g. an E82CC is a special quality version of an ECC82)
In 1952, the company was established as Japan Vacuum Engineering Co. Ltd, initially focusing on importing and selling various vacuum equipment. In 1973, the company ventured into the vacuum metallurgy business. In 2001, it was renamed to ULVAC, Inc. [3] [4] In 2014, ULVAC acquired the VAT Vacuum Products AG, a Swiss vacuum valve manufacturer.
Thermal shut off valve or Thermally released shut off valve, protects against excessive temperature, mandatory in the gas installation of some countries; Trap primer: sometimes include other types of valves, or are valves themselves; Vacuum breaker valve: prevents the back-siphonage of contaminated water into pressurized drinkable water supplies
In 1941, many United States broadcast stations were using radio tubes by Tung-Sol as evident in literature provided with the broadcasters dial indicators. [21] In 1943, there is a data sheet with copyright on the 703A ultra-high frequency triode vacuum tube used for the Joint-Army-Navy contract NXSR-81414. [22]
European tube manufacturers agreed on the system, but in the UK, MOV (Marconi-Osram Valve), STC/Brimar and Mazda/Ediswan maintained their own systems. Most MOV tubes were cross-licensed copies of RCA types, with a British designation. For example, an MOV X63 valve was the same as an RCA 6A8 tube.
In the Valves segment, VAT acts as a global developer, manufacturer and supplier of vacuum valves for the semiconductor, display, photovoltaic and vacuum coating industries as well as for various industrial and research applications. [1] By end of 2023 VAT held a market share of around 75% in vacuum valves for the production of semiconductors. [4]
The Flowserve Corporation is an American multinational corporation and one of the largest suppliers of industrial and environmental machinery such as pumps, valves, end face mechanical seals, automation, and services to the power, oil, gas, chemical and other industries. [5]
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