1. Low-pressure valves with pressure below 2.5 Mpa are called low-pressure valves.

2. The pressure above 2.5 Mpa is called high pressure valve.

3. The manufacturer of valves has a certificate called Special Equipment Pressure License, which is the best proof to identify a manufacturer's production capacity. The best grade is A1.

4. Low pressure valves are generally made of copper, cast iron, ductile iron, cast steel, stainless steel, etc.

5.High-pressure valves are made of almost all materials except copper, cast iron and ductile iron which can not be used, such as cast steel, stainless steel, etc.

6. Low-pressure valves are generally used in urban civil buildings, such as urban water pipelines, building fire control systems, central air-conditioning systems and so on, and some common civil areas.

7. High-pressure valves are generally used in industrial buildings, gold treatment, petroleum, chemical industry, power plants and so on.

8. The material and manufacturing standards of High-pressure valves are higher than those of low-pressure valves.