Many valves sit alongside the refrigerant loop. Some are there to tinker with the refrigerant stress (enlargement valves), Many others to control what course the refrigerant is flowing based on heating or cooling manner (reversing valves and Test valves). Absorption heat pumps are more elaborate and call for larger models https://industrialheatpumps35678.canariblogs.com/fascination-about-heat-pumps-46162237