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Datasheet generated 2026-10-07
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Danfoss TUB thermostatic expansion valve, R404A/R452A, 6 mm x 12 mm solder ODF

Danfoss · HVAC & Refrigeration · Expansion Valves · Denmark · danfoss.com
Part Number
068U3881  ·  HS 8481.80
Danfoss TUB thermostatic expansion valve, R404A/R452A, 6 mm x 12 mm solder ODF

Danfoss TUB universal thermostatic expansion valve, OEM P/N 068U3881. Internally equalized, stainless-steel body and capillary (fixed orifice, adjustable superheat, internally equalized). Refrigerant R404A/R452A. Nominal capacity 2.1 kW (0.6 TR) at the standard rating condition. Evaporating temperature range -15 to 10 °C. Inlet 6 mm, outlet 12 mm, Solder ODF. Static superheat 4 °C (adjustable). Capillary/bulb length 800 mm. Max working pressure 34 bar (500 psig). Angleway flow direction. Hermetic laser-welded design per EU F-gas Regulation 517/2014. EAN 5702428540353. MOP point -10 °C at MOP 50.

Technical Specifications

BrandDanfoss
Part number068U3881
TypeTUB (fixed orifice, adjustable superheat, internally equalized)
CategoryExpansion valves — thermostatic
RefrigerantR404A/R452A
Nominal capacity2.1 kW (0.6 TR)
Pressure equalizationInternally equalized
Orifice size4
Inlet connection6 mm, Solder ODF
Outlet connection12 mm, Solder ODF
Static superheat4 °C (7.2 °F), adjustable
Evaporating temperature range-15 °C to 10 °C (5 °F to 50 °F)
Capillary tube / bulb length800 mm
Max working pressure34 bar (500 psig)
Body materialStainless steel
Flow directionAngleway
EAN5702428540353
ApprovalsUL, EAC
Net weight0.149 Kilogram
Product groupExpansion valves
ApprovalEAC
Capillary tube length [in]31 in
Capillary tube length [mm]800 mm
China RoHS complianceYes with exemptions
China RoHS exemption clause7.1
Connection materialBi-metal: Steel/copper
DirectionStraightway
EU RoHS complianceYes with exemptions
EU RoHS exemption clause6(a)
Flow direction indicatorLaser engraved 1-way arrow
Fluid Group2
Inlet connection typeSolder, ODF
Inlet size [mm]6 mm
Max. Working Pressure [bar]34 bar
Max. Working Pressure [psig]500 psig
MOP Point [psig]MOP 50
MOP Point [°C]-10 °C
MOP Point [°F]15 °F
Orifice capacities [kW]2.1 kW
Orifice capacities [TR]0.6 TR
Outlet connection typeSolder, ODF
Outlet size [mm]12 mm
Parts includedBulb strap
PED categoryArt. 4, par. 3
Rated cap. cond. Range N [IMP]OS=7.2 ºF
Rated cap. cond. Range N [SI]OS=4K
REACH Candidate List substancesLead (CAS no. 7439-92-1)
RefrigerantsR404A/R452A
SealNo
Static Superheat (SS) [°C]4 °C
Static Superheat (SS) [°F]7.2 °F
Superheat settingAdjustable
Temperature range [°C] [max]-15 °C
Temperature range [°C] [min]-40 °C
Temperature range [°F] [max]5 °F
Temperature range [°F] [min]-40 °F
UL approved refrigerantsR404A
UL markYes

Properties

MaterialStainless steel
Pressure rating34 bar (500 psig) max working pressure
Temperature range-15 °C to 10 °C (evaporating)
Standard size6 mm x 12 mm
MOQ1

Compatibility

Rated for R404A/R452A. Select capacity to the evaporator load and rating condition per the TU/TC data sheet before ordering.

Approvals

Attached Documents