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'''Valve'''
== Valve ==


A '''valve''' is a device or natural object 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'', which means moving part of a door.
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.


== Types of valves ==
== Types of Valves ==


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.
Valves vary widely in form and application. Some of the most common types include:


=== Check valve ===
=== Ball Valve ===
A [[ball valve]] is a quarter-turn valve that uses a hollow, perforated, and pivoting ball to control flow through it. It is open when the ball's hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.


A '''[[check valve]]''', ''clack valve'', ''non-return valve'', ''reflux valve'', ''retention valve'' or ''one-way valve'' is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction.
=== Gate Valve ===
A [[gate valve]] opens by lifting a barrier (gate) out of the path of the fluid. Gate valves are used when a straight-line flow of fluid and minimum restriction is desired.


=== Ball valve ===
=== Globe Valve ===
A [[globe valve]] is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.


A '''[[ball valve]]''' is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball to control flow through it. It is open when the ball's hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.
=== Check Valve ===
A [[check valve]], also known as a non-return valve, allows fluid to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.


=== Butterfly valve ===
=== Butterfly Valve ===
A [[butterfly valve]] is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates.


A '''[[butterfly valve]]''' is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates.
== Applications ==


== Valve failures and diagnosis ==
Valves are used in a variety of applications, including:


Valve failures and diagnosis can be done by checking the following symptoms: leakage, valve stuck, valve disc corrosion, etc.
* [[Water supply]] systems
* [[Wastewater treatment]]
* [[Oil and gas]] industry
* [[Chemical]] and [[pharmaceutical]] manufacturing
* [[Power generation]]


== See also ==
== Operation ==


Valves can be operated manually, either by a handle, lever, pedal, or wheel. They can also be automated, driven by changes in pressure, temperature, or flow. More complex control systems using [[actuators]] are used for automatic control.
== Materials ==
Valves are made from a variety of materials, including:
* [[Brass]]
* [[Bronze]]
* [[Steel]]
* [[Stainless steel]]
* [[Plastic]]
== Related Pages ==
* [[Pipe (fluid conveyance)]]
* [[Pump]]
* [[Pump]]
* [[Piping and plumbing fitting]]
* [[Pressure measurement]]
* [[Hydraulics]]
* [[Hydraulics]]
* [[Pneumatics]]
* [[Pneumatics]]


== References ==
== Gallery ==


<references />
<gallery>
File:Water_valves_with_spigots.jpg|Water valves with spigots
File:Valve_cross-section.PNG|Valve cross-section
File:Nozzle_check_valve_disc-The-Alloy-Valve-Stockist.JPG|Nozzle check valve disc
File:Gordon_Power_Station_Control_Valve.jpg|Control valve at Gordon Power Station
File:Valve-balls-The-Alloy-Valve-Stockist.jpg|Valve balls
File:Check-valve-springs-in-inconel-The-Alloy-Valve-Stockist.JPG|Check valve springs in Inconel
File:Sea_water_cock.JPG|Sea water cock
File:3-way.svg|3-way valve diagram
File:Globe_valve_(rendered).jpg|Rendered globe valve
File:Green_tubes_and_valves.jpg|Green tubes and valves
File:Nasa-space-18408-l.jpg|NASA space valve
File:Butterfly-valve--The-Alloy-Valve-Stockist.JPG|Butterfly valve
File:Bidirectional_tight_butterfly_valve-The-Alloy-Valve-Stockist.jpg|Bidirectional tight butterfly valve
File:Hastelloy_Ball_valve.jpg|Hastelloy ball valve
File:Valve.jpg|General valve
File:Gate_valve.JPG|Gate valve
File:Swing_Check_valves.JPG|Swing check valves
File:Duplex-valve-A182-F51.JPG|Duplex valve
File:Inconel_gate_valve--The-Alloy-Valve-Stockist.JPG|Inconel gate valve
File:Wafer_check_valve--The-Alloy-Valve-Stockist.JPG|Wafer check valve
File:Inconel-Tilting_disc_check_valve--The-Alloy-Valve-Stockist.JPG|Inconel tilting disc check valve
File:Ball_valve--The-Alloy-Valve-Stockist.JPG|Ball valve
File:Cryogenic-gate-valve-The-Alloy-Valve-Stockist.JPG|Cryogenic gate valve
File:Inside-tilting-disc-check-valve-The-Alloy-Valve-Stockist.jpg|Inside tilting disc check valve
File:Duplex-ball-valves-The-Alloy-Valve-Stockist.JPG|Duplex ball valves
File:Cryogenic-stainless-steel-gate-valve-The-Alloy-Valve-Stockist.JPG|Cryogenic stainless steel gate valve
File:Duplex-ball-valves-The-Alloy-Valve-Stockist-side.JPG|Side view of duplex ball valves
File:Flanged-Nozzle-check-valve-The-Alloy-Valve-Stockist.JPG|Flanged nozzle check valve
File:Inside-wafer-check-valve-The-Alloy-Valve-Stockist.JPG|Inside wafer check valve
File:Large-swing-check-valve-The-Alloy-Valve-Stockist.jpg|Large swing check valve
File:Nozzle-check-valve-disc-The-Alloy-Valve-Stockist.jpg|Nozzle check valve disc
File:Valve-balls-The-Alloy-Valve-Stockist.jpg|Valve balls
File:Wafer-check-valve-The-Alloy-Valve-Stockist.JPG|Wafer check valve
File:Valve-nuts-bolts-The-Alloy-Valve-Stockist.jpg|Valve nuts and bolts
File:Check-valve-springs-in-inconel-The-Alloy-Valve-Stockist.JPG|Check valve springs in Inconel
File:Ball-valve-ball-The-Alloy-Valve-Stockist.jpg|Ball valve ball
</gallery>


== External links ==
{{Reflist}}
 
* [http://www.example.com Official website]


[[Category:Valves]]
[[Category:Valves]]
[[Category:Plumbing]]
[[Category:Fluid dynamics]]
[[Category:Mechanical engineering]]
[[Category:Hydraulics]]
{{stub}}

Revision as of 01:23, 10 February 2025

Valve

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.

Types of Valves

Valves vary widely in form and application. Some of the most common types include:

Ball Valve

A ball valve is a quarter-turn valve that uses a hollow, perforated, and pivoting ball to control flow through it. It is open when the ball's hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.

Gate Valve

A gate valve opens by lifting a barrier (gate) out of the path of the fluid. Gate valves are used when a straight-line flow of fluid and minimum restriction is desired.

Globe Valve

A globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.

Check Valve

A check valve, also known as a non-return valve, allows fluid to flow through it in only one direction. Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave.

Butterfly Valve

A butterfly valve is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates.

Applications

Valves are used in a variety of applications, including:

Operation

Valves can be operated manually, either by a handle, lever, pedal, or wheel. They can also be automated, driven by changes in pressure, temperature, or flow. More complex control systems using actuators are used for automatic control.

Materials

Valves are made from a variety of materials, including:

Related Pages

Gallery

<references group="" responsive="1"></references>

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