Types of valve and their function

Types of the valve and their functions

The valve can be classified on their-

1. Basic by-operating pressure.
2. Basic by-By function.
3. By Specific types.
* Table of content👇

1. Basic Type - By Operating Principle

Valves can be classified into the following types based on their operating system.

* Ball valve

The ball valve is used for on / off control without pressure drop. Ideal for quick shut-off, as the 90 ° turn is completely shut-off compared to many 360 ° turns for other manual valves.

* Butterfly valve

A butterfly valve is used for on / off flow control in large diameter pipes.

* Choke Valve

in the choke valve, the choke moves the solid cylinder up or down around or inside another cylinder with a valve, hole, or slot. Used for high pressure drops found in oil and gas wells, not to be confused with engine choke valves.

* The diaphragm or membrane valve

The diaphragm valve or membrane valve is used for controls the flow by the movement of the diaphragm. It is used in pharmaceutical applications.

* Gate valve

Gate valve is mainly used for on/off control with low-pressure drop.

* Globe valve

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The globe valve is good for regulating flow. it is using a cylindrical movement over a seat.

Knife valves

 Knife valve is similar to gate valves, but usually more compact. Often used for on / off control of slurry or powder.

Needle valve

The needle valve is used for precise flow control.

Pinch valves

A pinch valve is used for the slurry flow regulation and their control.

Piston valve

The piston valve is used for regulating liquids that carrying solids in suspension.

Plug valves

The plug valve is used for on/off control, but with some pressure drop.

Solenoid valves

A solenoid valve is an electrically actuated valve that controls pneumatic and hydraulic fluid flow.

Spool valves

A spool valve is similar to choke valves, which are used for hydraulic control.

2. Basic Type - By Function

Valves can also be classified based on their function.

* The check valve or non-return valve

Check valve or non-return valve allows the fluid to move in one direction only.

* Flow control valves

 The flow control valve is used to maintain and control a variable flow rate through the valve.

* Poppet valves

The poppet valve is typically used to control fuel mixture intake and exhaust in piston engines.

* Pressure reducing valve

A pressure-reducing valve is used to control fluid pressure.

* Safety valve or relief valve

A safety valve or relief valve is operated automatically at a specified pressure or set pressure to fix a potentially dangerous situation, usually, overpressure.

3. Specific type

These are the more specialized types of valves, which are used only in particular areas or applications. Often they are subcategories of classification by operation theory and function.

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* Aspin valve

Aspin valve is a cone-shaped metal part mounted on the cylinder head of the engine.

* Ball cock

Ball cock valve is often used as a water level controller (furrow)

* Bibcock

Bibcock valve is used to provides a connection with a flexible hose.

* Blast valve

The blast valve prevents rapid pressure in the fallout shelter or bunker.

* Boston Valve

In the Boston valve, there is a three-part two-port check valve used on inflatable boats, air mattresses, airbeds, etc..., It is available in two sizes, normal and small.

* Clock

Colloquial for a small valve or stopcock

* Ceramic disc valves

Ceramic disc valves are mainly used on high duty cycle applications or abrasive fluids. Ceramic discs may also provide class IV seat leakage.

Choke valve

Internal combustion engines use butterfly valves to limit air intake. There is no confusion with it, so choke valves used in industrial flow control.

Clapper Valve

A type of check valve used in Siamese fire equipment allows only 1 hose to be connected instead of two (the clapper valve prevents leaking on the other side).

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Fill and drain valve

A valve used in the space and missile industry to achieve extremely tight leakage, while providing redundant prevents against external leakage.

Flow divider valve

 It is a valve providing a multiplicity of flow from a single fluid source.

Pulsation (Heimlich) Valve:

A pulsation valve is a specialized one-way valve used at the end of a chest drain tube to treat pneumothorax.

Foot valve

It is a check valve at the foot of the suction line to prevent backflow.

Four-way valve

A four-way valve is used to control the flow of steam in the cylinders of early double-acting steam engines.

Freeze Seal / Freeze Plug

In which the freezing and melting of the fluid forms and remove the plug of the frozen material acting as a valve.

The gas pressure regulator

It controls the flow and pressure of the gas.

Heart valve

 It regulates the flow of blood through the heart in many organisms.

Hydrodynamic Vortex Valve

An idle flow control valve that uses hydrodynamic forces to regulate the flow.

The needle control valve

The needle control valve is often in great shape used in water supply systems.

Leaf valve

A leaf valve is a one-way valve with a diagonal barrier covered by a hinged flap.

Line Blind Valve

Line blind valve is a thin sheet oriented and perpendicular to the pipe. The sheet has a solid end and a flow-through end, By moving it from one position to another, the flow opens or stops. It is also called a sliding blind valve.

Outflow valve

Outflow valve controls flow and pressure, part of cabin pressure.

Pilot Valve

The pilot valve controls the flow or pressure of other valves.

Pinch Valve

"Beach Ball Valve": Simple, single-part two-port check valve made of soft plastic and molded on inflatable units such as beach balls, air mattresses, water fins; Can be inflated by pump or by mouth.

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Plunger valve

A plunger valve is used to control the flow while reducing pressure.

Poppet Valves and Sleeve Valves

Typically used to control fuel mixture intake and exhaust in piston engines.

Pressure regulator or pressure reducing valve (PRV)

It is used to reduces the pressure to a predetermined level of the valve.

Pressure-retaining valve, or back-pressure regulator

it is maintaining pressure at a predetermined level of the valve.

Presta, Schrader, or Dunlop valves

Tt valve used to capture air in bicycle tires

Reed valve

It consists of two or more flexible materials that are pressed together along their length, but the flow field is open to allow unilateral flow, much like heart valves.


Used in scuba diving equipment and gas cooking equipment to reduce high-pressure gas supply to low working pressure.

Rotary valves and piston valves

Rotary valves and piston valve parts of brass instruments used to change their pitch.

Rupture discs

the use of one-time usable valves for rapid pressure relief used to protect the piping system from excessive pressure or vacuum; More reliable than the safety valve.

Saddle valves

Saddle valve where permitted used to tap pipe requiring low flow.

Shredder valve

A shredder valve is used to hold air inside the automobile tire.

Slide Valve

The slide valve is used in early steam engines to control the ingress and emission of steam from the piston.

Slide Gate Valve

Slide Gate Valve. Ideal for handling dry bulk materials in gravity flow, tapered phase, or dense phase pneumatic conveying applications. Similar to a sliding line blind valve, but the latter is intended for high-pressure applications.


The stopcock is restricting or separates the flow through pipes.

Sliver Valve

The specially designed Jul-Thompson pressure reduction/expansion valve provides a centrifugal force on the discharge stream to improve gas-liquid phase separation.

Tap (British English), Tap (American English): Common name for valves

A tap valve is used in homes to control the flow of water.

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Tesla Valve

A form of check valve that has no moving parts, invented by Nikola Tesla is used liquids.

Thermally operated valve:

  • Thermal expansion valves

These are used in refrigeration and air conditioning systems.

  • Thermostatic mixing valve
  • Thermostatic Radiator Valves
  • Thermal shut off valve or thermally release shut off valve

It prevents excessive temperature, is mandatory in some countries gas installation.

Trap Primer

Sometimes other types of valves are included or are the valves themselves.

Vacuum breaker valve

prevents back-siphonage of contaminated water into potable water supply under pressure.

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