ETS 250 (034G2611) Danfoss Electric Expansion Valve

Product Overview

The ETS 250 (034G2611) is a high-capacity, electronically operated expansion valve (EEV) engineered for precision refrigerant mass flow regulation in large-scale industrial refrigeration and air conditioning systems. As a flagship component in the Danfoss ETS series, the Danfoss 034G2611 (034G2611) utilizes a high-resolution bipolar stepper motor to achieve accurate needle positioning. This level of precision is critical for maintaining stable superheat (SH) control, maximizing the energy efficiency of high-output chillers, and protecting compressors in B2B thermal management loops. Featuring a straightway design with symmetric 42.00 mm copper ODF connections, this valve is optimized for high-performance systems where reliability and high mass flow rates are mandatory.

Technical Configuration

The technical architecture of the 034G2611 is built for durability and high-resolution control. It features a balanced internal cage and needle design that ensures linear flow characteristics and supports native bi-flow operation—essential for reversible heat pump circuits. The electrical interface is a standardized M12 4-pin male connector, providing a vibration-proof and moisture-tight link to the electronic controller. With an IP67 enclosure rating, the actuator is fully hermetic, ensuring reliable operation in harsh industrial environments prone to heavy condensation and frost. The 42.00 mm copper solder connections facilitate standard brazing integration into large-diameter piping architectures.

Technical Specifications

Technical FAQs

What are the advantages of the M12 electrical connection on the ETS 250?

The M12 4-pin connector is an industry-standard interface that provides a hermetic, moisture-proof electrical link. It simplifies maintenance through quick-disconnect functionality and eliminates "wicking," where moisture travels through wire strands into the motor housing.

Does the 034G2611 support bi-directional flow?

Yes, the ETS 250 series is designed with a balanced internal needle that maintains identical mass flow accuracy in both directions. This is essential for heat pump systems that switch between heating and cooling modes.

What control driver is required for this large-capacity valve?

The 034G2611 requires a bipolar stepper motor driver (such as the Danfoss EKD or EKE series) capable of providing a phase current of 100 mA RMS. A total of 3810 steps is required for a full-stroke operation in the ETS 250 range.

Engineering & Installation Guide

• Brazing Thermal Management: Due to the large 42 mm copper connections, significant heat is required for brazing. It is mandatory to wrap the valve body in a wet cloth and ensure the internal temperature stays below 100 Celsius. Excessive heat will permanently damage the stepper motor magnets and the internal PEEK valve seat.

• M12 Cable Security: When attaching the M12 cable, hand-tighten the connector to ensure the O-ring seal achieves its IP67 rating. Always implement a "drip loop" in the cabling to prevent water or condensate from tracking directly into the electrical interface.

• Controller Calibration Sequence: Upon initial commissioning, the EEV controller must perform a full stroke initialization (overdrive) of at least 3810 steps to establish the mechanical "zero" (fully closed) position. Failure to synchronize the controller with the valve's physical state will lead to unstable superheat regulation and potential compressor damage.