Working Temperature of API Valves

Ultra-low Temperature Valves

Temperature range: -196°C to -100°C

Application: For ultra-low temperature media such as liquefied natural gas (LNG), liquid oxygen, and liquid nitrogen.

Material: Usually low temperature resistant materials such as stainless steel and nickel alloy are used.

Cryogenic Valves

Temperature range: -100°C to -29°C

Application: For cryogenic gas, refrigeration system, etc.

Material: Commonly used materials include stainless steel, low temperature carbon steel, etc.

Normal Temperature Valves

Temperature range: -29°C to 120°C

Application: For normal temperature media such as water, air, and oil.

Material: Commonly used materials include carbon steel, cast iron, bronze, etc.

Medium Temperature Valves

Temperature range: 120°C to 450°C

Application: For medium temperature media such as steam, hot water, hot oil, etc.

Material: Common materials include carbon steel, alloy steel, stainless steel, etc.

High Temperature Valves

Temperature range: 450°C to 600°C

Application: For high temperature media such as high temperature steam, hot air, high temperature oil, etc.

Material: Common materials include alloy steel, stainless steel, heat-resistant steel, etc.

Ultra-high Temperature Valves

Temperature range: above 600°C

Application: For extreme high temperature environments such as high temperature furnaces, nuclear reactors, and spacecraft.

Material: Common materials include special alloys, ceramics, high temperature resistant composite materials, etc.

Selection Points

Medium temperature: Select the appropriate valve type and material according to the highest and lowest operating temperatures of the medium.

Material temperature resistance: Ensure that the valve material has good mechanical properties and corrosion resistance within the operating temperature range.

Sealing material: Select sealing material suitable for the working temperature to ensure sealing performance.

Thermal expansion: Consider the thermal expansion and thermal stress of the valve at high temperature to ensure structural stability.

Cooling measures: In ultra-high or ultra-low temperature environments, additional cooling or insulation measures may be required.