YORK 025-38170-000 Expansion Valve

025-38170-000 is the original part number of York (a brand under Johnson Controls). The standard description is Thermostatic Expansion Valve (TXV); in the domestic York parts system, it is listed alongside 025-35133-000 and is uniformly classified as "Oil-Cooled Expansion Valve" (the former is often referred to as "Oil-Cooled Expansion Valve Small").
Specification: Brass valve body; interface type is 3/4" pipe ORFS (O-ring face seal) + 1" Female Orifice Swivel (internal thread hole type adapter), it is a detachable joint rather than a welded one; the actual size is approximately 21.1 cm in length, 16.8 cm in width, and 11.2 cm in height, weighing about 1.1 kg (different channels may mark it as 1 lb or 6 kg, the difference should be due to different packaging or data).
Function： The thermostatic expansion valve senses the temperature and pressure changes at the outlet of the evaporator (or oil cooler) through the temperature sensing bulb, automatically switches to regulate the throttling opening, control the liquid refrigerant flow entering the evaporator, maintain a stable superheat, ensuring heat exchange efficiency and preventing excessive liquid supply from causing compressor liquid strike. On York units, this component is mainly used in the lubricating oil cooling circuits of centrifugal/large-screw chiller units, by controlling the refrigerant flow entering the oil cooler to maintain the oil temperature within an appropriate range, ensuring the viscosity and lubrication, sealing performance of the lubricating oil.