What's inside a Thermal Expansion Valve TXV - how it works hvac

The video explains the role of expansion valves in refrigeration systems, focusing on a T2 thermal expansion valve. It covers the valve's components, such as the power head, capillary tube, and sensing bulb, and their materials. The video details how expansion valves regulate refrigerant flow based on superheat, preventing liquid refrigerant from damaging the compressor. It includes a demonstration of disassembling the valve to show its internal parts and explains the mechanism of pressure and flow control. Finally, it discusses adjusting the superheat and tuning the valve for optimal performance.

What is the primary function of an expansion valve in a refrigeration system?

• To compress the refrigerant

• To increase the temperature of the refrigerant

• To control the flow of refrigerant into the evaporator

• To cool the refrigerant

What material is the main body of the T2 thermal expansion valve made from?

• Brass

• Copper

• Plastic

• Aluminum

How does the sensing bulb contribute to the operation of the expansion valve?

• It filters the refrigerant

• It senses superheat and adjusts pressure

• It measures the temperature of the refrigerant

• It compresses the refrigerant

What happens to the refrigerant as it passes through the expansion valve?

• It becomes a low-pressure liquid vapor mixture

• It remains a high-pressure liquid

• It becomes a high-pressure gas

• It turns into a solid

What role does the diaphragm play in the expansion valve?

• It moves to control the pin and refrigerant flow

• It adjusts the refrigerant temperature

• It filters the refrigerant

• It compresses the refrigerant

How can the superheat control be adjusted in an expansion valve?

• By replacing the sensing bulb

• By altering the capillary tube length

• By rotating the plug to adjust spring force

• By changing the refrigerant type

What is the purpose of the spring in the expansion valve?

• To filter the refrigerant

• To heat the refrigerant

• To provide resistance against the diaphragm

• To compress the refrigerant