This is an original Trane VAL10643 3-way solenoid valve body (without coil), designed for capacity control in Trane ACRA series screw chillers. It is used to switch air or oil circuits to achieve compressor loading and unloading, ensuring stable and reliable operation of the chiller unit. It is a genuine OEM replacement part, perfectly matching the original installation size and interface, and can be used with the matching Trane coil COL23107. It is widely applied in industrial and commercial central air conditioning, water chillers, and HVAC systems, with high durability, stable performance, and long service life under refrigerant and lubricating oil working conditions.