Valve | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Valve


00:01:31 1 Applications
00:03:12 2 Variation
00:04:07 3 Types
00:04:34 4 Components
00:04:54 4.1 Body
00:06:15 4.2 Bonnet
00:07:01 4.3 Ports
00:07:36 4.4 Handle or actuator
00:08:18 4.5 Disc
00:09:31 4.6 Seat
00:10:47 4.7 Stem
00:12:06 4.8 Gaskets
00:12:23 4.9 Valve balls
00:12:53 4.10 Spring
00:13:31 4.11 Trim
00:14:12 5 Valve operating positions
00:14:42 5.1 Two-port valves
00:17:10 5.2 Three-port valves
00:18:17 5.3 Four-port valves
00:18:59 6 Control
00:20:44 7 Other considerations
00:22:05 8 Images



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SUMMARY
=======
A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways.  Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure.  The word is derived from the Latin valva, the moving part of a door, in turn from volvere, to turn, roll.
The simplest, and very ancient, valve is simply a freely hinged flap which drops to obstruct fluid (gas or liquid) flow in one direction, but is pushed open by flow in the opposite direction. This is called a check valve, as it prevents or "checks" the flow in one direction.  Modern control valves may regulate pressure or flow downstream and operate on sophisticated automation systems.
Valves have many uses, including controlling water for irrigation, industrial uses for controlling processes, residential uses such as on/off and pressure control to dish and clothes washers and taps in the home. Even aerosols have a tiny valve built in.  Valves are also used in the military and transport sectors.  In HVAC ductwork and other near-atmospheric air flows, valves are instead called dampers.  In compressed air systems, however, valves are used with the most common type being ball valves.