Which of the following illustrated expansion...

Question 1 of 2921866636eee28f7522a1c51e9b1

Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? Illustration RA-0024

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Question 1 of 29218

Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? Illustration RA-0024

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🔍 Key Concepts

• Difference between a thermostatic expansion valve (TXV) and an automatic/constant-pressure expansion valve (AEV) • How a remote sensing bulb and capillary tube are used to control superheat at the evaporator outlet • How evaporator pressure is transmitted to the valve diaphragm or bellows to maintain a nearly constant pressure in the evaporator

💭 Think About

• In which illustration is the main controlling force on the diaphragm coming from evaporator pressure, not from temperature at the outlet? • Which valves in the drawings clearly use a remote bulb on the outlet line, and what variable do those valves control? • Which illustration shows a valve that will tend to throttle flow to hold a set suction/evaporator pressure, even if the load or superheat changes?

✅ Before You Answer

• Identify any valve that has a remote sensing bulb and capillary attached to the evaporator outlet line – these typically control superheat, not constant pressure. • Look for a design where the diaphragm or bellows is exposed directly to evaporator pressure on one side and a spring on the other, with no remote bulb. • Confirm that the valve you choose could maintain a nearly constant evaporator pressure even when the evaporator load varies, rather than maintaining a fixed superheat.