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What are the requirements for gaskets in refrigeration system valves?

December 06,2023

The gaskets in refrigeration system valves are crucial sealing components that ensure proper valve closure and prevent refrigerant leaks. The requirements for valve gaskets include material selection, sealing performance, corrosion resistance, and high-temperature resistance. Here is a detailed analysis of the requirements for gaskets in refrigeration system valves:

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Part 1: Material Selection:

Sealing Performance: Valve gaskets should have excellent sealing performance to effectively prevent refrigerant leakage. Therefore, the material needs to have a low permeability to maintain the seal.

Elasticity and Compressibility: Valve gaskets should have certain elasticity and compressibility to ensure a good seal when the valve is closed and withstand pressure and temperature changes without losing sealing performance.

Wear Resistance: Due to the opening and closing operation of the valve, gaskets may experience friction and wear. Therefore, the material needs to have good wear resistance to prolong the service life of the gaskets.

Chemical Corrosion Resistance: Chemical agents and refrigerants are commonly used in refrigeration systems, so valve gaskets need to have resistance to chemical corrosion to maintain their stability and sealing performance.

High-Temperature Resistance: The operating temperature in refrigeration systems is usually low, but in some cases, gaskets may come into contact with higher temperatures, such as near compressors. Therefore, valve gaskets need to have a certain level of high-temperature resistance.

Part 2: Sealing Performance:

Low Leakage Rate: Valve gaskets should have a low leakage rate, meaning they can effectively prevent refrigerant leakage when the valve is closed. This is crucial for the efficiency and safety of the refrigeration system.

Good Sealing Performance: Valve gaskets need to provide good sealing performance under different pressure conditions. Whether under high or low pressure, valve gaskets should maintain a stable sealing state.

Part 3: Corrosion Resistance:

Refrigerant Barrier: Valve gaskets should effectively prevent refrigerants and other chemicals from corroding the valve and other components of the system to extend their service life.

Corrosion Resistance: Corrosive substances such as ammonia and hydrogen fluoride may be present in the refrigeration system. Valve gaskets need to resist the corrosion caused by these substances to maintain a good seal.

Part 4: High-Temperature Resistance:

Temperature Range: Valve gaskets need to maintain their performance stability within the operating temperature range of the refrigeration system. Typically, the working temperature of a refrigeration system can range from -40°C to 150°C, so valve gaskets need to have the corresponding high-temperature resistance.

Part 5:

The gaskets in refrigeration system valves are crucial sealing components that ensure proper valve closure and prevent refrigerant leaks. Different types of valves play different roles in refrigeration systems, so the requirements for their gaskets may vary. Below are the specific requirements for  check valves, electronic expansion valves, thermostatic expansion valves, solenoid valves, and electric control valves: 

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Check Valve Gasket Requirements:

Check valves are mainly used to prevent refrigerant backflow and have a one-way flow function. Therefore, the requirements for check valve gaskets are as follows:

Sealing Performance: Check valve gaskets should have good sealing performance to effectively prevent refrigerant backflow when the valve is closed.

Wear Resistance: Since check valves frequently open and close, gaskets need to have good wear resistance to extend their service life.

High-Temperature Resistance: Some check valves may come into contact with higher temperatures, so gaskets should have high-temperature resistance to maintain their normal function.

Electronic Expansion Valve Gasket Requirements:

Electronic expansion valves are used to control the flow of refrigerants and ensure the appropriate amount enters the evaporator. The requirements for electronic expansion valve gaskets are as follows:

Sealing Performance: Electronic expansion valve gaskets should have good sealing performance to ensure accurate control of refrigerant flow by the expansion valve.

Corrosion Resistance: Electronic expansion valves may come into contact with chemical agents or corrosive refrigerants, so gaskets should have corrosion resistance to maintain their stability and sealing performance.

High-Temperature Resistance: Electronic expansion valves may come into contact with higher temperatures, so gaskets should have high-temperature resistance to maintain their normal function.

Thermostatic Expansion Valve Gasket Requirements:

Thermostatic expansion valves are used to control the flow and pressure of refrigerants based on the system's load requirements. The requirements for thermostatic expansion valve gaskets are as follows:

Sealing Performance: Thermostatic expansion valve gaskets should have good sealing performance to ensure accurate control of refrigerant flow and pressure under different load conditions.

High-Temperature Resistance: Thermostatic expansion valves may come into contact with higher temperatures, so gaskets should have high-temperature resistance to maintain their normal function.

Solenoid Valve Gasket Requirements:

Solenoid valves are used to control the flow and direction of refrigerants, typically through electromagnetic forces to open and close the valve. The requirements for solenoid valve gaskets are as follows:

Sealing Performance: Solenoid valve gaskets should have good sealing performance to ensure complete valve closure and prevent refrigerant leakage.

Wear Resistance: Due to the frequent opening and closing operations of solenoid valves, gaskets need to have a certain level of wear resistance to extend their service life.

High-Temperature Resistance: Solenoid valves may come into contact with higher temperatures, so gaskets should have high-temperature resistance to maintain their normal function.

Electric Control Valve Gasket Requirements:

Electric control valves are used to control the flow and pressure of refrigerants by electric motors to open and close the valve. The requirements for electric control valve gaskets are as follows:

Sealing Performance: Electric control valve gaskets should have good sealing performance to ensure accurate control of refrigerant flow and pressure by the valve.

Wear Resistance: Due to the frequent opening and closing operations of electric control valves, gaskets need to have good wear resistance to extend their service life.

High-Temperature Resistance: Electric control valves may come into contact with higher temperatures, so gaskets should have high-temperature resistance to maintain their normal function.

In summary, gaskets in refrigeration system valves need to have good sealing performance, wear resistance, corrosion resistance, and high-temperature resistance. However, the specific requirements may vary depending on the type of valve. It is important to choose a gasket material that meets the specific requirements to ensure proper valve closure, prevent refrigerant leakage, and maintain the efficiency and safety of the refrigeration system.


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