Question 127Refrigeration/AC - 1st Asst/Chief70% to pass
Which of the following illustrated thermal expansion valves would be appropriate to use on an evaporator coil with a 2 psi pressure drop, where externally adjustable superheat and a replaceable power element are both desired? Illustration GS-RA-06
AI Explanation
The correct answer is B.
The illustrated thermal expansion valve type B would be the most appropriate choice for an evaporator coil with a 2 psi pressure drop, as it provides externally adjustable superheat and a replaceable power element, which are both desired features in this application.
The other options would not be as suitable - type A lacks external superheat adjustment, type C does not have a replaceable power element, and type D is typically used for higher pressure drop applications.
Related Questions
#125 In the multi-evaporator refrigeration system shown in the illustration, what is the proper name for the valve labeled "29"? Illustration GS-RA-12 #126 When the sensing bulb of a thermostatic expansion valve is charged with a fluid different from the charge used in the system, what name of the charge is associated with the power element? #128 Constant superheat is maintained at the evaporator coil outlet of a refrigeration system or unit by the action of what device? #129 Refrigerant flow through a thermostatic expansion valve is greatest under what conditions? #130 In refrigeration systems with multiple evaporators, the metering of refrigerant to each refrigerated space evaporator is accomplished by what device?