Applicable medium and temperature range of low temperature valve

In the modern industrial field, low-temperature valves, as a key equipment, are mainly used to deal with fluid media under low temperature conditions to ensure the safety and efficiency of fluid control systems. The design and material selection of cryogenic valves must be able to withstand extreme low temperature environments to prevent material embrittlement and seal failure. The following will discuss in detail the medium and temperature range for low temperature valves.

Applicable medium

Low temperature valve is mainly suitable for dealing with some media that need to be stored or transmitted in a low temperature environment, common are:

1. Liquefied natural gas (LNG) : LNG is a medium of natural gas cooled to about -162°C (-259°F), which requires the use of special low-temperature valves to ensure the tightness and safety of the system during storage and transportation.

2. Liquefied petroleum gas (LPG) : LPG is generally liquefied under the conditions of -40°C to -45°C (-40°F to -49°F), and the low temperature valve in this medium ensures its stability during pressurization and storage and transportation.

3. Liquid oxygen (LOX) : Liquid oxygen is an accelerant liquefied at -183°C (-297°F). In aerospace and hospital oxygen supply systems, cryogenic valves ensure the safe delivery and use of liquid oxygen.

4. Liquid nitrogen (LIN) : Liquid nitrogen is a medium from which nitrogen is liquefied under conditions below -196°C (-320°F) and is widely used in food freezing, metal handling and scientific experiments, where cryogenic valves play a key fluid control role.

5. Liquid hydrogen (LH2) : Liquid hydrogen is usually liquefied below -253°C (-424°F), which is used in space launch, energy storage and other fields, and its storage and transportation process requires very high low temperature resistance of the valve.

Temperature range

The temperature range that cryogenic valves can withstand is generally from -45°C (-49°F) to -253°C (-424°F), depending on the low temperature properties of different materials. For example:

1. Stainless steel and nickel-based alloys: These materials can better resist low temperature embrittlement, often used in liquid nitrogen, liquid oxygen and other media treatment, suitable for temperatures between -196°C (-320°F) and -253°C (-424°F).

2. Polytetrafluoroethylene (PTFE) and polyurethane and other polymer materials: These materials have excellent low temperature resistance and are often used to make seals. They can be applied in the temperature range from -40°C to -196°C (-40°F to -320°F).

3. Low temperature steel: Specially designed low temperature steel is suitable for extreme low temperature environments such as liquefied natural gas and can withstand temperatures of -162°C (-259°F).

Through a wide selection of materials and advanced design, cryogenic valves can maintain effective working conditions in extremely cold environments, ensuring the safety and reliability of industrial processes. In the future, with the development of new materials and new technologies, the application range and performance of low temperature valves will be further improved to meet the application needs of more extreme low temperature conditions.