Danfoss 068U3707 Thermostatic Expansion Valve – R290 Propane

The Danfoss 068U3707 is a stainless steel thermostatic expansion valve (TXV) designed for use with R290 (propane) refrigerant in commercial refrigeration applications. This externally equalized, angleway valve ensures precise superheat control in systems requiring A3-class safety compliance.

Key Features

• Refrigerant: R290 (Propane)
• Capacity: 5.33 kW (1.51 tons)
• Temperature Range: –40°C to +10°C
• Inlet/Outlet: 1/4 inch ODF x 3/8 inch ODF
• Capillary Tube: 800 mm (31 inch)
• Equalization: External
• Configuration: Angleway, bidirectional
• Max Working Pressure: 34 bar (500 psig)
• Material: Stainless steel with bi-metal connections

Applications

Used in low- and medium-temperature commercial refrigeration systems using R290, including freezers, bottle coolers, and display cases where flammable refrigerants are approved.

Competitor or Equivalent Part Numbers

• Danfoss 068U3708 – Straightway version
• Danfoss 068U3709 – Internally equalized version

Frequently Asked Questions

• Can I use this valve with R22 or R404A?
  No, this valve is engineered specifically for R290.
• Is the superheat adjustable?
  Yes, it is factory set to 4°C and can be adjusted.