Product Description
Product Overview
The QBO3A motorized ball valve is a two-way on/off valve designed for HVAC terminal water-loop control. Driven by a reversible synchronous motor and controlled by a thermostat or building automation signal, it opens or closes the flow path to regulate heating or cooling delivery. Its compact actuator, reliable sealing and low power consumption make it suitable for fan-coil units, air handling units and small chilled-water distribution systems.
Key Features
- Reversible synchronous motor with power consumption only during switching (2 VA)
- Manual override lever for commissioning and emergency operation
- IP54 actuator enclosure resists dust and splashing water
- Low close-off pressure drop and tight shut-off performance
- Straight-through flow path resists blockage and reduces water hammer
- Quick actuator removal for easy field maintenance
- AC 24 V standard power with AC 220 V optional
Specifications
| Model | QBO3A |
| Valve Type | Two-way motorized ball valve |
| Nominal Diameter | DN32-DN50 (other sizes available in series) |
| Power Supply | AC 24 V ±10% (AC 220 V optional), 50/60 Hz |
| Power Consumption | 2 VA (only during opening/closing) |
| Motor Type | Reversible synchronous motor |
| Running Time | 60 s / 100 s |
| Output Torque | 4 N·m (QB02A) / 8 N·m (QB03A) |
| Lead Wire Length | 700 mm (customizable) |
| Nominal Pressure | 1.6 MPa |
| Close-off Pressure | < 0.6 MPa |
| Connection | G-thread (BSPP) |
| Medium | Chilled water, hot water or 50% ethylene glycol solution |
| Medium Temperature | 2~70 °C / 2~90 °C |
| Protection Rating | IP54 |
Applications
- Fan-coil unit water-side on/off control
- Air handling unit heating/cooling coils
- Small-zone chilled and hot water distribution
- Commercial building HVAC retrofit projects
Installation Notes
- Keep the actuator above the horizontal centerline to avoid water ingress
- Do not apply excessive force to the actuator during installation
- Use matching G-thread fittings and proper thread sealant
- Flush the pipeline before commissioning to protect the ball and seats
- Verify wire polarity: red = open, blue = close, black = neutral
- Insulate the valve body and pipework, but leave the actuator exposed for cooling