ClimateMaster 69172600 Reversing Valve 340155-7026 What does 'Normally Closed' mean

What does 'Normally Closed' mean for this specific part

low-absorption filters

This HVAC motor capacitor is built to withstand the demanding duty cycles of industrial equipment

It includes the necessary high-grade components to restore factory-spec protection in condensing units and walk-in coolers

ClimateMaster 69172600 Reversing Valve 340155-7026 What does 'Normally Closed' meanThe ClimateMaster 69172600 Reversing Valve is a critical OEM replacement part designed for high performance heat pump systems. This heavy duty 4 way reversing valve facilitates the precise redirection of refrigerant flow, allowing the unit to toggle seamlessly between heating and cooling modes. Engineered for R 410A refrigerant applications, it maintains system integrity under high pressure conditions up to 690 psig. As a ClimateMaster 69172600