🔍 Key Concepts

• Note the water inlet and outlet labels on the body of the valve – this valve is controlling water flow, not refrigerant flow directly. • Look at the remote sensing bulb and capillary tube (item 1) and the diaphragm/bellows (item 4). Think about which system pressure or temperature they would logically be sensing. • Review what each device does: head pressure regulating valve, suction pressure regulating valve, evaporator pressure regulating valve, and thermostatic expansion valve, and where each one is normally installed in a refrigeration system.

💭 Think About

• Ask yourself: is this valve located in a water line, a liquid refrigerant line, or a suction refrigerant line, based on the illustration? Which of the listed devices is normally found in that location? • Consider what condition this valve is designed to keep nearly constant (pressure or temperature, and on which side of the system) by throttling the flow that passes through it. • Compare this construction with the typical look and location of a thermostatic expansion valve: does that valve usually regulate water flow or refrigerant flow to the evaporator?

✅ Before You Answer

• Verify which of the four answer choices is associated with controlling condenser cooling water to maintain a desired condenser or discharge pressure. • Confirm that a suction pressure regulating valve and an evaporator pressure regulating valve are normally installed in the refrigerant suction line, not in a water line. • Make sure a thermostatic expansion valve is recognized as the valve that meters liquid refrigerant into the evaporator, not one that has water inlet/outlet connections as shown.