🔍 Key Concepts

• Solenoid valve function in a refrigeration liquid line • Difference between a solenoid valve and a thermostatic expansion valve (TXV) • Meaning of throttling versus on/off control in a system

💭 Think About

• Ask yourself: does a solenoid valve have a sensing bulb or element that measures temperature or superheat, or is it operated another way? • Think about whether a solenoid valve is typically used for fine flow regulation or for starting/stopping flow altogether. • Consider what part of the system normally handles superheat control and what part simply allows or interrupts flow.

✅ Before You Answer

• Verify whether a solenoid valve is electrically actuated and whether it modulates or simply opens/closes. • Confirm which component in a typical refrigeration system actually senses superheat (name that device). • Check if a device that throttles refrigerant must be able to modulate flow continuously, or just switch between open and shut.