Comprehensive analysis of common valve types and functions of refrigeration units

solenoid valve

Concept: Solenoid valve is an automatic control device that uses the magnetic force generated by the solenoid coil to drive the valve to open and close. It is mainly used to adjust or switch the flow path of fluids (such as water, gas, oil, etc.).

Functions and functions: Solenoid valves can quickly respond to electrical signals, realizing remote control and automated operation. In industrial control systems, they are often used to control the direction, flow rate and pressure of the medium, and are suitable for various occasions where frequent operation and rapid reactions are required.

2. Thermal expansion valve

Concept: Thermal expansion valve is a key component in the refrigeration system, which automatically adjusts the flow rate of the refrigerant according to the superheat of the refrigerant at the outlet of the evaporator.

Functions and functions: The main functions include throttling and reducing the pressure, that is, converting high-pressure liquid refrigerant into low-pressure mist to facilitate evaporation; and adjusting the flow rate and automatically adjusting the refrigerant supply according to temperature changes to match the changes in the refrigeration load.

3. Electronic expansion valve

Concept: The electronic expansion valve is an automatic adjustment device controlled by electronic signals. Compared with the thermal expansion valve, it can adjust the refrigerant flow more accurately and quickly.

Functions and functions: In addition to the basic functions of thermal expansion valves, electronic expansion valves also provide more refined control, suitable for variable frequency air conditioning and precise temperature control refrigeration systems, improving energy efficiency ratio and system performance.

4. Four-way valve

Concept: A four-way valve is a reversing valve, which is usually used in refrigeration equipment, and can change the flow direction of refrigerant and switch the cooling and heating modes.

Function and Function: Through the positional changes of the internal piston or slider, the four-way valve can interchange the roles of the condenser and evaporator, thereby enabling the conversion of the refrigeration system from cooling to heating mode without the need for additional refrigeration cycles.

5. Evaporation pressure regulating valve

Concept: The evaporation pressure regulating valve is a device used to maintain the internal pressure of the evaporator.

Function and Function: By implementing a throttling effect on the suction pipe, the regulator can automatically adjust the refrigerant flow rate according to the load of the evaporator, avoiding the occurrence of too low evaporation pressure and ensuring the constant evaporation temperature.

6. Condensation pressure regulating valve

Concept: A condensation pressure regulating valve is a device used to maintain the internal pressure of the condenser.

Function and function: The condensation pressure regulating valve can automatically adjust the flow rate or air volume of the cooling medium according to the load of the condenser to maintain the pressure stability inside the condenser and improve the energy efficiency of the system

7. Safety valve

Concept: A safety valve is a protection device. When the pressure in the system exceeds the set value, the valve will automatically open and discharge a certain amount of medium to reduce the system pressure and prevent the system from explosion or damage due to overpressure.

Function and function: In the refrigeration system, safety valves are the key components to ensure the safe operation of the system. When the pressure rises abnormally due to failure or other reasons, the safety valve can be opened to relieve pressure in time to avoid equipment

damage and casualties, and ensure the safety of the entire refrigeration system.

Shanghai KUB Refrigeration Equipment Co., Ltd.

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