1) "Valve" -- As to valve
valve
Pronunciation: 'valv
Function: noun
Etymology: Latin valva; akin to Latin volvere to roll -- more at VOLUBLE
1 archaic : a leaf of a folding or double door
2 [New Latin valva, from Latin] : a bodily structure (as the mitral valve) that closes temporarily a passage or orifice or permits movement of fluid in one direction only
3 a : any of numerous mechanical devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or regulated by a movable part that opens, shuts, or partially obstructs one or more ports or passageways; also : the movable part of such a device b : a device in a brass instrument for quickly channeling air flow through an added length of tube in order to change the fundamental tone by some definite interval c chiefly British : ELECTRON TUBE
4 [New Latin valva, from Latin] : one of the distinct usually hinged and movable pieces of which the shell of some shell-bearing animals (as lamellibranch mollusks, brachiopods, and barnacles) consists
5 [New Latin valva, from Latin] a : one of the segments or pieces into which a dehiscing capsule or legume separates b : the portion of various anthers (as of the barberry) resembling a lid c : one of the two encasing membranes of a diatom
- valved /'valvd/ adjective
- valve·less /'valv-l&s/ adjective
Pronunciation Symbols

For other uses, see Valve (disambiguation).

These water valves are regulated by handles.
A valve is a device that regulates the flow of substances (either gases, fluidized solids, slurries, or liquids) by opening, closing, or partially obstructing various passageways. Valves are technically pipe fittings, but usually are discussed separately.

Valves are used in a variety of applications including industrial, military, commercial, residential, transportation. Plumbing valves are the most obvious in everyday life, but many more are used.

Some valves are driven by pressure only, they are mainly used for safety purposes in steam engines and domestic heating or cooking appliances. Others are used in a controlled way, like in Otto cycle engines driven by a camshaft, where they play a major role in engine cycle control.

1 Application

2 Valve parts

2.1 Body

2.2 Ports

2.3 Connections to ports

2.4 Discs and rotors

2.5 Seat

2.6 Stem

2.7 Bonnet

2.8 Spring

2.9 Valve Balls

3 Valve operating positions

3.1 2-way valves

3.2 3-way valves

4 Control

5 Other considerations

6 Types of valves

7 Images

8 See also

9 External links

A large variety of valves are available and have many applications with sizes ranging from tiny to huge. The cost of valves ranges from very cheap simple disposable valves in some items to very expensive valves for specialized applications. Often not realized by some, small valves are even inside some common household ite..."

Further Data On Term for valve
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