Sanhua RFGB04-0.44-32 Thermostatic Expansion Valve – R134a, Internally Equalized, 0.44 USRT (≈1.5 kW), Built-In Orifice

Sanhua RFGB04-0.44-32, R134a refrigerant thermostatic expansion valve (TXV). It continuously adjusts the refrigerant flow entering the evaporator according to the superheat at the evaporator outlet. It is used in refrigerators, freezers, ice machines, dehumidifiers and small air conditioning systems.

Orifice Built Into the Body: No Need to Buy a Separate Orifice

The distinguishing feature of the RFGB series is its built-in orifice. In Sanhua's RFKH series, the orifice is sold separately and must be ordered together with the valve; in the RFGB, the orifice is inside the valve — the product works on its own straight out of the box.

The trade-off is this: the capacity is fixed by the valve itself and cannot be changed later. If you want to change the capacity, the whole valve is replaced. This is preferred in small and series-production applications; in systems where capacity changes frequently, RFKH is more flexible.

Technical Specifications (Official Sanhua Datasheet)

• Model: Sanhua RFGB04-0.44-32
• Refrigerant: R134a
• Nominal Capacity: 0.44 USRT (≈ 1.5 kW)
• Equalization Type: Internal equalization — the body has no separate equalizer connection
• Orifice: Built into the body (built-in), not replaceable
• Max. Working Pressure: 2.1 MPa (21 bar) — for R134a
• Refrigerant Temperature: −40 … +70 °C | Ambient Temperature: −35 … +55 °C
• Capillary Tube: 800 mm | Connection tubes: all copper
• Construction: Warm thermo head construction
• Certificates: UL/CSA · PED declaration
• Code reading: RFGB = TXV with built-in orifice · 04 = R134a · no letter E = internal equalization · 0.44 = nominal capacity (USRT)

• ⚠️ Confirm the connection size before ordering. Sanhua produces this capacity with two connection options: 1/4" inlet → 3/8" outlet or 3/8" inlet → 1/2" outlet (ODF brazed). There are also straight and angle body options — on the straight body the superheat can be adjusted in the field, on the angle body it is factory-set. Tell us your system pipe size and we will confirm the correct variant.
• 🔧 When is internal equalization sufficient? It works correctly in single-pass evaporators with low pressure drop. Distributor-fed, multi-pass or long evaporators require the externally equalized (E) version.
• 🔧 Sensing bulb connection: clamp it to the suction pipe on a horizontal run at the 3-4 o'clock position, in full contact, and insulate it. If it is attached under the pipe, oil accumulation causes false readings.
• Cool the body with a wet cloth during brazing and purge with nitrogen; the built-in orifice and internal seal are damaged by heat.
• ⚠️ Refrigerant compatibility: This valve is charged for R134a. It must not be used in an R404A, R407C or R290 system — the thermal charge is different and superheat control goes off. For other refrigerants, the codes RFGB02 (R407C), RFGB03 (R404A/R507A) and RFGB06 (R290) are used.