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

Correct Answer: Option B — B

Valve B incorporates an externally adjustable superheat spring mechanism and a flanged or threaded replaceable power element assembly. This design suits evaporators with minimal pressure drops by providing precise superheat control and easy servicing of the thermostatic charge element.