Danfoss 003N-7252 Temperature Regulator

The Danfoss 003N-7252 is a professional-grade AVTB 20 thermostatic water valve engineered for self-acting temperature regulation in demanding HVACR environments. This 3/4 inch NPT temperature regulator operates without auxiliary energy, utilizing a liquid-filled thermostatic element to maintain precise control in hot water tanks, heat exchangers, and oil preheaters. Featuring a 70-140°F temperature range, this direct-acting controller is designed to close on rising temperature, effectively throttling flow as the setpoint is reached to prevent overheating and ensure system efficiency. The valve body is constructed from high-quality brass with a linear flow characteristic, supporting a Kvs value of 3.4 m³/h and a maximum working pressure of 232 psi (16 bar). Reliability is maximized through a robust bellows assembly and a 2-meter capillary tube, providing consistent mechanical temperature control across diverse media, including fresh water and neutral brine solutions. This self-contained unit simplifies installation for contractors by eliminating the need for wiring or external sensors.

• Self-Acting Operation: Operates entirely on thermal expansion, requiring no electrical power or compressed air for regulation.
• Precise Control Logic: Configured for "Close on Rise" functionality, ideal for maintaining stable temperatures in heating-side applications.
• High-Durability Construction: Features a forged brass body and NBR sealing to ensure long-term performance in district heating and industrial circuits.
• Flexible Mounting: The 2-meter capillary allows the sensor to be positioned in the optimal flow path regardless of valve orientation.
• Wide Compatibility: Standard 3/4" FNPT connections and a 232 psi pressure rating make it compatible with most standard commercial hydronic systems.

What is the difference between AVTB and AVTA valves?
The AVTB series, like this 003N-7252 model, is specifically designed for heating applications and typically closes as the temperature at the sensor increases. In contrast, the AVTA series is a cooling water valve that opens on rising temperature to provide cooling flow.

Can the 003N-7252 be used with glycol solutions?
Yes, this regulator is suitable for use with water or neutral brine, including glycolic water mixtures up to 30%, provided the media pH remains between 7 and 10.

How do I adjust the temperature setpoint?
The valve features an integrated handle with a calibrated scale. Rotating the handle adjusts the reference spring tension against the thermostatic bellows to set the desired closing temperature within the 70-140°F range.

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.