Valve identification and model, the entrance must see!


Release time:

2020-02-13

Beginners to valves often mistake the faucet for a valve. In fact, the faucet strictly belongs to the bathroom series. Valves are divided into gate valve, globe valve, butterfly valve, high pressure valve, low pressure valve, fluorine lined valve, safety valve, pressure relief valve, anti-corrosion valve, filter, check valve, pressure reducing valve, over flow valve, ceramic valve, medium pressure valve, high temperature valve, low temperature valve and so on.

Beginners to valves often mistake the faucet for a valve. In fact, the faucet strictly belongs to the bathroom series. Valves are divided into gate valve, globe valve, butterfly valve, high pressure valve, low pressure valve, fluorine lined valve, safety valve, pressure relief valve, anti-corrosion valve, filter, check valve, pressure reducing valve, over flow valve, ceramic valve, medium pressure valve, high temperature valve, low temperature valve and so on.

I. Classification

By power points

1 Automatic valve

Valves that operate on the strength of the medium itself. Such as check valve, pressure reducing valve, trap, safety valve, etc.

2 Drive valve

Rely on manpower, power, hydraulic, pneumatic and other external forces to operate the valve. Such as globe valve, throttle valve, gate valve, disc valve, ball valve, plug valve, etc.

According to the structural characteristics of the points

1 Closure door: the closing piece moves along the center line of the seat.

2 Gate shape: The closing piece moves along the center line perpendicular to the seat.

3 Cock - shaped: The closing piece is a plunger or ball that rotates around its center line.

4 Swing: The closing piece rotates around a shaft outside the seat.

Disc: The closing member is a disc, revolving around the shaft in the seat.

6 Slide valve type: the closing part slides in the direction perpendicular to the channel.

According to the use of the points

1 off: used to cut off or connect the pipeline medium. Such as stop valve, gate valve, ball valve, plug valve, etc.

2 Adjustment: used to adjust the pressure or flow of the medium. Such as pressure reducing valve, regulating valve.

3 Distribution: used to change the flow direction of the medium, distribution role. Such as three-way cock, three-way globe valve, etc.

4 Check use: used to prevent the backflow of the medium. Such as a check valve.

5 Safe use: When the medium pressure exceeds the specified value, the excess medium is discharged to ensure the safety of the equipment. Such as safety valve, accident valve.

6 blocked air drainage: retain gas, exclude condensate water. Such as a trap.

According to the control method points

1 Manual valve: with the help of hand wheel, handle, lever, sprocket, gear, worm gear, etc., by human to operate the valve.

2 Electric valve: with the help of electricity to operate the valve.

3 Pneumatic valve: with compressed air to operate the valve.

4 Hydraulic valve: with the help of water, oil and other liquids, transfer external force to operate the valve.

According to the pressure points

Vacuum valve: absolute pressure less than 1 kg/cm 2 valve.

Low pressure valve: nominal pressure less than 16 kg/cm 2 valve.

3 Medium pressure valve: nominal pressure 25-64 kg/cm 2 valve.

4 High pressure valve: nominal pressure 100-800 kg/cm 2 valve.

5 Ultra-high pressure: nominal pressure of 1000 kg/cm 2 or greater valves.

According to the medium temperature points

1 Common valve: suitable for medium working temperature -40 to 450℃ valve.

2 High temperature valve: suitable for medium working temperature of 450 to 600℃ valve.

3 Heat-resistant valve: suitable for medium operating temperature of 600℃ above the valve.

4 Low temperature valve: suitable for medium working temperature -40 to -70℃ valve.

5 cryogenic valve: suitable for medium operating temperature -70 to -196℃ valve.

6 ultra-low temperature valve: suitable for medium operating temperature -196℃ below the valve.

According to nominal diameter points

1 Small diameter valve: nominal diameter less than 40 mm valve.

Medium diameter valve: nominal diameter 50 to 300 mm valve.

3 Large diameter valve: nominal diameter 350 to 1200 mm valve.

4 Large diameter valve: nominal diameter greater than 1400 mm valve.

The above categories are not absolute and can be classified from other perspectives, but mastering these basic categories is of great benefit to our understanding of a wide variety of valves.