ETS 250 (034G2601) Danfoss Electric Expansion Valve

Product Overview

The ETS 250 (034G2601) is a high-capacity, electronically operated expansion valve (EEV) engineered for precision refrigerant mass flow regulation in large-scale industrial air conditioning and refrigeration systems. As a cornerstone of the Danfoss ETS series, the Danfoss 034G2601 (034G2601) utilizes a high-resolution bipolar stepper motor to provide accurate needle positioning, which is critical for maintaining stable superheat (SH) control and maximizing the energy efficiency of high-output chillers and heat pumps. Featuring a straightway design with 35 mm copper ODF connections, this valve is designed for high-performance B2B thermal management loops where reliability, fast response times, and high mass flow rates are mandatory.

Technical Configuration

The technical architecture of the 034G2601 is optimized for heavy-duty industrial applications. It features a balanced internal needle design that ensures linear flow characteristics and supports bi-flow operation, making it suitable for reversible heat pump circuits without additional check valves. The electrical interface is a standardized M12 4-pin male connector, providing a secure, vibration-resistant, and moisture-tight link to the electronic controller. With an IP67 enclosure rating, the actuator is fully protected against the harsh conditions of industrial plant rooms, including heavy condensation and frost during low-temperature operation. The 35 mm copper solder connections facilitate standard brazing practices in large-diameter piping systems.

Technical Specifications

Technical FAQs

What are the benefits 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 the risk of "wicking," where moisture travels through wire strands into the motor housing.

Does the 034G2601 support bi-directional flow?

Yes, the ETS 250 series is designed with a balanced internal cage and 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 034G2601 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 35 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 high-resolution 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.