Valve Classification Methods

1. General Classification (Most Common)

Categorized by principle, function, and structure. Main types include:

Gate valve, globe valve, throttle valve, ball valve, butterfly valve, check valve, safety valve, pressure reducing valve, steam trap, control valve, diaphragm valve, plug valve, plunger valve, instrument valve, filter, drain valve, foot valve.The main gate valves product names of China gate Valve Network include:GB Bellows Wedge Gate Valve,High Temperature & pressure Power Station Gate Valve,Inside Screw Non-rising Stem Wedge Gate Valve,Insulation Jacket Gate Valve,Lined Gate Valve,MZ44W Rising Stem Gas Quick Open&close ParallelMZ48W Manual Non-rising Stem City Gas Quick Gate Valve,Manual Knife-shaped Gate Valve,Manual Slurry ValveManual Wedge Copper Gate Valve,Manual Vacuum Isolated Wedge Gate Valve

2.Classification by Purpose and Function

3.Shut-off Valves: Block or connect fluid flow. E.g., gate valve, globe valve, ball valve.

Check Valves: Prevent backflow. E.g., various check valves.

Control Valves: Regulate flow or pressure. E.g., control valve, throttle valve, pressure reducer.

Safety Valves: Overpressure protection. E.g., all types of safety valves.

Diverting Valves: Separate, distribute, or mix media. E.g., distribution valve, steam trap.

3. Classification by Pressure Rating

Vacuum valve: Operating pressure below atmospheric.

Low-pressure valve: PN < 1.6 MPa.

Medium-pressure valve: PN 2.5 - 6.4 MPa.

High-pressure valve: PN 10.0 - 80.0 MPa.

Ultra-high-pressure valve: PN > 100 MPa.

4. Classification by Media Temperature

Cryogenic valve: t < -100℃.

Low-temperature valve: -40℃ ≤ t < -100℃.

Normal temperature valve: -40℃ < t ≤ 120℃.

Medium-temperature valve: 120℃ < t ≤ 450℃.

High-temperature valve: t > 450℃.

5. Classification by Body Material

Metal valves: Cast iron, carbon steel, alloy steel, copper alloy valves.

Non-metallic valves: Plastic, ceramic, fiberglass valves.

Lined valves: Plastic-lined, glass-lined, rubber-lined valves.

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