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2. Gate valve - Wikipedia

   en.wikipedia.org/wiki/Gate_valve

   Gate valves may have flanged ends drilled according to pipeline-compatible flange dimensional standards. Gate valves are typically constructed from cast iron, cast carbon steel, ductile iron, gunmetal, stainless steel, alloy steels, and forged steels. All-metal gate valves are used in ultra-high vacuum chambers to isolate regions of the chamber ...

3. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   The inside of an extremely large butterfly valve Duplex ball valve Three check valves in corrosion-resistant Hastelloy Stainless steel gate valve. Valves can be categorized into the following types, based on their operating mechanism: Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely ...

4. Blast gate - Wikipedia

   en.wikipedia.org/wiki/Blast_gate

   A blast gate is a gate valve used to focus a dust collection system's vacuum pressure for maximum dust (or other material) extraction at the desired location. Blast gates are positioned near individual pieces of machinery and operate by being closed by default, blocking air flow.

5. Ultra-high vacuum - Wikipedia

   en.wikipedia.org/wiki/Ultra-high_vacuum

   To save time, energy, and integrity of the UHV volume an airlock or load-lock vacuum system [6] is often used. The airlock volume has one door or valve, such as a gate valve or UHV angle valve, [7] facing the UHV side of the volume, and another door against atmospheric pressure through which samples or workpieces are initially introduced. After ...

6. Tetrode - Wikipedia

   en.wikipedia.org/wiki/Tetrode

   A tetrode is a vacuum tube (called valve in British English) having four active electrodes.The four electrodes in order from the centre are: a thermionic cathode, first and second grids, and a plate (called anode in British English).

7. Vacuum tube - Wikipedia

   en.wikipedia.org/wiki/Vacuum_tube

   Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.