Four Seasons' expansion devices are specifically calibrated to provide proper flow to the evaporator as well as restricting or modulating high pressure liquid causing a pressure drop to lower the refrigerant temperature. They also provide optimum cabin comfort for both the driver and passengers.

• Block Valves are aluminum construction; all internal parts are designed to OE specifications
• Internally and Externally Equalized Valves are copper and brass construction
• Tubes to Cap connections are double soldered to insure integrity
• Coverage includes both forward and reverse flow designs
• Tonnage and Superheat is matched to OE specifications
• Power valve is seasoned for 30 days, assembled and 100% function tested prior to shipping

Expansion Valves regulate refrigerant flow within the system. Other than the Compressor, this is the only other moving part in the system.

• Expansion Valves can become contaminated with system debris
• Expansion Valves cannot be flushed and should be replaced whenever the Compressor is replaced

A Ein erstklassiges variables Expansionsventils (VOV) ist so konzipiert, dass es die Leistung je nach Betriebsbedingungen ändert. Dies verbessert die Leistung der Klimaanlage bei niedrigen Geschwindigkeiten und im Leerlauf erheblich, da mehr Kältemittel fließen kann.