In modern HVAC/R systems, the widespread adoption of refrigerants like R32 and R410A has increased the demand for flow control sensitivity. The EEV 0.6A-4.5B series electronic expansion valves from Ningbo Brando are engineered to address the limitations of traditional thermostatic expansion valves (TXV), such as lagging response and superheat fluctuations under low loads. By utilizing precise stepper motor drives, this series achieves full-range coverage from micro-adjustments to high-flow supply, providing essential hardware for energy-efficient digital control in heat pumps and multi-split systems.

The EEV series classification is directly based on the orifice diameter, serving as the primary parameter for engineering selection.

• Precision Control for Low Loads: The EEV0.6A to EEV1.3A models feature orifice sizes from 0.6mm to 1.3mm, ideal for small cooling units ranging from 0.5kW to 9.2kW.
• Mid-Range System Compatibility: The EEV1.6A to EEV2.4A models expand orifice sizes from 1.6mm to 2.4mm, covering cooling capacities between 7kW and 28.8kW.
• High-Capacity Commercial Demand: Models EEV3.0A to EEV4.5B offer orifice sizes up to 4.5mm. Under R32 conditions, the nominal capacity reaches 117kW, meeting the requirements of commercial chillers and modular heat pumps.

In demanding environments, EEV reliability hinges on structural pressure limits and motor torque performance.

• Pressure Integrity: All EEV series are designed with a Maximum Operating Pressure (MOP) of 43 bar, preventing fatigue deformation in high-pressure R410A cycles.
• Dynamic Opening Performance: The Maximum Operating Pressure Difference (MOPD) ranges from 27 bar to 35 bar, ensuring the stepper motor responds instantly and resets precisely even under high back-pressure.
• Connection Versatility: Products feature ODF solder connections with tube diameters from 6.35mm to 17mm, matching standard copper pipe specifications to minimize leakage risks.