According to power

Automatic valve: a valve that relies on the power of the medium itself to operate. Such as check valves, pressure reducing valves, traps, safety valves, etc.

Driven valve: a valve that relies on external forces such as manpower, electricity, hydraulic power, and pneumatic power to operate. Such as globe valve, throttle valve, gate valve, butterfly valve, ball valve, plug valve, etc.

According to usage

Break valve: cut off or connect the pipeline medium. Such as stop valves, gate valves, ball valves, plug valves, etc.;

Regulating valve: regulates the pressure or flow of the medium. Such as pressure reducing valves and regulating valves;

Check valve: prevents medium from flowing back. Such as check valve.

Distribution valve: changes the flow direction of the medium and plays a distribution role. Such as three-way cock, three-way stop valve, etc.

Safety valve: When the pressure exceeds the limit value, the excess medium is discharged to ensure the safety of the equipment. Such as safety valves and emergency valves;

Gas blocking drain valve: retains gas and removes condensation water, such as a drain valve.

Break valve: cut off or connect the pipeline medium. Such as stop valves, gate valves, ball valves, plug valves, etc.;

Regulating valve: regulates the pressure or flow of the medium. Such as pressure reducing valves and regulating valves;

Check valve: prevents medium from flowing back. Such as check valve.

Distribution valve: changes the flow direction of the medium and plays a distribution role. Such as three-way cock, three-way stop valve, etc.

Safety valve: When the pressure exceeds the limit value, the excess medium is discharged to ensure the safety of the equipment. Such as safety valves and emergency valves;

Gas blocking drain valve: retains gas and removes condensation water, such as a drain valve.

According to operation method

Manual valve: A valve that is operated by human power with the help of handwheels, handles, levers, sprockets, gears, worm gears, etc.

Electric valve: A valve operated by electricity.

Pneumatic valve: A valve operated by compressed air.

Hydraulic valve: a valve that uses liquids such as water and oil to transmit external force to operate.

Pressure points

Vacuum: Valves with absolute pressure less than 1 kg/cm2.

Low pressure: valves with nominal pressure less than 16 kg/cm2.

Medium pressure: valve with nominal pressure 25-64 kg/cm2.

High pressure: valves with nominal pressure of 100-800 kg/cm2.

Ultra-high: valves with nominal pressure reaching or greater than 1000 kg/cm2.

According to medium temperature

Ordinary valves: -40 to 450℃ (medium temperature)}.

High temperature valve: valve between 450 and 600℃ (medium temperature).

Heat-resistant valves: valves with temperatures above 600°C (medium temperature).

Low temperature valve: -40 to -70℃ (medium temperature) valve.

Cryogenic valves: valves from -70 to -196°C (medium temperature).

Ultra-low temperature valve: valve below -196℃ (medium temperature).

According to nominal diameter

Small diameter: valves with a nominal diameter less than 40 mm.

Medium diameter: valves with nominal diameters from 50 to 300 mm.

Large diameter: valves with nominal diameters from 350 to 1200 mm.

Extra large diameter: valves with a nominal diameter greater than 1400 mm.

The above classification is not absolute and can be classified from other perspectives. As long as you master these basic classifications, it will be of great benefit to understand the wide range of valves.

Welcome to YOONAD valve factory , pls feel free to contact us with any valves, such as ball valve, butterfly valve, check valve, globe valve,gate valve,safety valve, control valve etc.