Valves Classified by Nominal Pressure

The nominal pressure is an important parameter of a valve, which reflects the pressure range that the valve can withstand under normal operating conditions. According to this parameter, valves can be classified into different categories for easy selection and use. The common nominal pressure ratings of valves include low pressure, medium pressure, and high pressure, and different types of valves have different application ranges and performance requirements under these pressure ratings.

1. Vacuum valve: This type of valve is designed specifically for vacuum systems, with a working pressure lower than standard atmospheric pressure. In processes such as vacuum coating, vacuum drying, and vacuum distillation, it is responsible for controlling the inflow and outflow of gases and maintaining the necessary vacuum degree. Due to high sealing performance being its key, any leakage of external air may affect the process effect.

   
   

2. Low pressure valve: This type of valve is suitable for daily life and general industrial fields, such as urban water supply, building water supply and drainage, and low-pressure steam pipelines. They meet the common needs of low-pressure fluid transportation and control, characterized by low cost, simple structure, and convenient operation. Household faucets and ordinary heating pipe valves belong to this category.

3. Medium pressure valves: They are suitable for industrial scenarios with moderate pressure, such as medium pressure steam systems and pipelines in some chemical processes. Medium pressure valves require reliable control of medium flow and pressure to ensure system stability, and their manufacturing process and sealing performance requirements are high.

   
   

4. High pressure valve: This type of valve is specially designed for the high-pressure industrial field, such as high-pressure hydrogenation, natural gas transportation, and high-pressure boilers in the petrochemical industry. They have a sturdy structure, are made of high-strength alloys, and are equipped with a complex sealing system to ensure safe and stable control of medium flow and pressure in high-pressure environments.

   
   

5. Ultra high pressure valve: used in special industrial applications with extreme high pressure, such as ultra-high pressure water jet cutting and experimental equipment. Its design, manufacturing, and testing all face extremely high technological challenges, requiring the use of cutting-edge materials and processes to meet the stringent requirements for strength, sealing, and reliability in ultra-high pressure environments.