Belimo Z2050QPTF+CQB24SRL Actuator

The Belimo Z2050QPTF+CQB24SRL is a high-performance 1/2 inch pressure independent characterized control valve (PICCV) assembly designed for precise hydronic regulation in demanding HVAC systems. This 2-way ZoneTight valve features a fixed 4.3 GPM flow rate and utilizes a 24V modulating actuator to maintain constant flow regardless of pressure fluctuations across the coil. Engineered for high-close-off requirements, the CQB24SRL non-spring return actuator provides linear control with a 2 to 10 VDC signal, ensuring domestic hot water or chilled water loops stay balanced. The Z2050QPTF series eliminates the need for manual balancing valves, reducing installation complexity and energy consumption. Its low-profile design is ideal for fan coil units and radiant ceilings where space is at a premium. By maintaining a constant differential pressure across the internal orifice, this assembly prevents overflow and starvation in variable flow systems, directly improving heat exchanger efficiency and pump performance.

• Pressure Independence: Maintains a consistent 4.3 GPM flow rate despite system pressure swings.
• Precise Modulation: 2-10 VDC control signal allows for fine-tuned temperature management.
• High Close-off: ZoneTight technology ensures zero leakage, preventing ghost energy loads.
• Labor Savings: Integrated PICCV design eliminates the requirement for a separate balancing valve.
• Compact Footprint: Low-profile assembly fits easily into tight plenum spaces and terminal units.

Common Questions

How does this valve handle varying pump speeds?
The internal regulator compensates for pressure changes, ensuring the output stays at 4.3 GPM even as the rest of the variable frequency drive system adjusts.

What is the control signal for the CQB24SRL?
This actuator operates on a 24V AC/DC power supply and accepts a modulating 2 to 10 VDC input for proportional control.

Is this unit suitable for steam applications?
No, this assembly is specifically designed for water-based hydronic systems (chilled or hot water) within the specified temperature limits of the ZoneTight series.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.