Sanhua SHF(L)-7H-34U-52 4-Way Reversing Valve – 3/8"→1/2", Kv 2.9, Inverter Compatible, Without Coil

Sanhua SHF(L)-7H-34U-52 is a 4-way valve that reverses the cycle in heat pumps and heating-cooling systems. Its inlet is 3/8" ODF and its other three connections are 1/2" ODF solder.

Reverses the Cycle in a Heat Pump — Also Suitable for Systems with Inverter Compressors

The 4-way valve determines which heat exchanger the compressor discharge gas is sent to. In the cooling position the outdoor unit is the condenser and the indoor unit is the evaporator; when the valve changes position, the roles are reversed and the same circuit heats. The defrost cycle is also carried out with this valve.

This model is in Sanhua's "Variable & Fixed Speed" class — meaning it can also be used in systems with variable speed (inverter) compressors. In inverter systems, the pressure differential in the system decreases when the compressor runs at low speed; in this series, the minimum pressure differential required for the valve to change position has been reduced to 0.1 MPa (1 bar). In the older -51 series this value was 0.25 MPa — this is the real cause of failure to reverse at low speed.

Technical Specifications (Official Sanhua Datasheet, Table 1)

• Model: Sanhua SHF(L)-7H-34U-52 | Part no: 10180952602
• System type: Variable & Fixed Speed — inverter and fixed-speed systems
• Connection ØD: 3/8" ODF solder | ØE / S / C: 1/2" ODF solder
• Port diameter: 11.1 mm | Kv value: 2.9 m³/h
• Max. operating pressure (MOP): 4.7 MPa = 47 bar
• Changeover pressure differential (OPD): min 0.1 MPa · max 4 MPa
• Media temperature (TS): −30 … +135 °C | Ambient temperature: −30 … +50 °C
• Net weight: 0.3 kg
• Certification: UL / CSA · PED Article 4.3 (Fluid Group 1 and 2)
• Compatible refrigerants: R22 · R134a · R404A · R407C · R410A · R507 · R450A/R513A · R32 · R290 · R1234ze(E) · R1234yf

🚨 Coil Not Included

Sanhua 4-way valves are sold without a coil. The valve is operated by gas pressure; electricity goes only to the coil that drives the pilot valve, which sets the direction. The coil is selected separately according to the supply voltage:

• 🔧 Mounting position: Sanhua's instruction is clear — the valve is mounted with the coil facing upward or with the body axis horizontal. The flow direction is set according to the installation instructions.
• ⚠️ Brazing warning: the body is thin-walled and contains a PTFE slide. While brazing, wrap the body in a wet cloth and do not point the flame directly at the body — excessive heat permanently jams the slide.
• Fault diagnosis: if the valve does not change direction, check in order — (1) is the coil winding intact, (2) is voltage reaching the coil, (3) is there a pressure differential of at least 0.1 MPa in the system. If all three are fine, the problem is in the pilot valve.
• Need more capacity? In the same series with 3/8" inlet / 1/2" outlet, the next size up is SHF(L)-11H-35U and the next size down is SHF(L)-4H-23U-52 (5/16"→3/8").