Danfoss 037N0059 is a thermostatic expansion valve used for refrigeration and air conditioning applications. It is designed with a manual lever operated equalizer, an integrated internal check valve, a capillary tube, and a built-in strainer. This valve can control the flow of refrigerant and can be used for various applications such as chilled water, CO2, and R410A systems. The valve has a range of 15 to 80 psig, a pressure drop of 2 psig, and a capacity of 70 tons of refrigeration.