IRTC’s own instructor, Zach, spoke at the Blue Ridge Chapter’s Western Virginia Expo on Thursday! His presentation topic was “Hands-On: Setting Hand Expansion Valves.”

“We looked at the three main applications of hand expansion valves in refrigeration systems (expansion, minimum flow, and metering for recirculated evaporators),” Zach said. “We quickly reviewed enthalpy (P-h) diagrams to explain why these applications are different, and how the correct setpoints could be calculated using engineering data. We then kicked on the system, and explored checking the setpoint, and different practical approaches to setting them that don’t involve calculations.”