this valve features 5/16-inch ODF x 5/8-inch ODF connections and includes a 36-inch capillary tube to ensure accurate superheat monitoring at the evaporator outlet

making it highly adaptable for varied 24Vac valve assembly requirements

Universal Compatibility: Consolidates inventory by replacing nearly all existing oil primary controls

Malleable iron provides better resistance to impact and thermal expansion

The reversible rotation capability and shell-band/thru-bolt mounting options ensure a versatile fit for various furnace and air handler configurations

Siemens DDC R540-103 Controller 318172-701 this valve features 5/16-inch ODFThe Siemens R540 103 is a precision engineered constant volume controller designed for integration into Siemens DDC HVAC systems. As a refurbished unit equivalent to the 540 103N, it serves as a critical component for maintaining stable airflow in commercial ventilation and air handling applications. This direct digital control unit manages airflow by ensuring a steady output against varying duct static pressures, making it essential for building