A multiple evaporator system is equipped...

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Question 1 of 205eccef9dbacbc34ba4d4600f

A multiple evaporator system is equipped with a evaporator back pressure regulating valve on the warmer of the two boxes. This valve must be bypassed when pumping down the system for repairs because reduction of suction pressure would cause the valve to do what?

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🔍 Key Concepts

• Evaporator back pressure regulating valve function in a multi-box refrigeration system • Relationship between suction pressure and the position (open/closed) of a back pressure regulating valve • What happens to a pressure-controlled valve when the sensed pressure drops below its set point

💭 Think About

• Think about whether a back pressure regulating valve is designed to maintain a minimum pressure or a maximum pressure on the evaporator it serves. • If you are pumping down the system, what is happening to the suction pressure, and how would a valve that tries to hold back pressure respond to that change? • Consider which valve action (rupture, open, close, chatter) would be the normal mechanical response to low pressure, and which would be unusual or damaging and therefore not the basic control action.

✅ Before You Answer

• Review how a back pressure regulating valve is supposed to control the evaporator pressure in normal operation. • Confirm whether lowering suction pressure tends to force the valve toward a more open or more closed position. • Eliminate options that describe failure modes (like mechanical damage or instability) versus the intended control response to a low pressure condition.

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