DANFOSS ETS 50 034G1706 Electric Expansion Valve

Product Overview

The 034G1706 (034G1706) is a high-precision Electric Expansion Valve (EEV) from the Danfoss ETS 50 series, engineered for accurate liquid injection in air conditioning and refrigeration systems. Utilizing a sophisticated stepper motor actuator, the 034G1706 provides precise control of refrigerant flow, ensuring optimal evaporator efficiency and maintaining stable superheat even under rapidly changing load conditions. The valve features a straightway design with 1 1/8 inch solder ODF connections and a bi-metal (steel/copper) construction for simplified installation. Designed for integration with electronic controllers, this ETS 50 valve is essential for high-performance chillers, heat pumps, and commercial refrigeration units, where it reduces energy consumption and protects the compressor by preventing liquid carry-over.

Technical Configuration

The ETS 50 series is characterized by its balanced design and robust electrical interface, specifically built for high-demand industrial cooling cycles:

• Balanced Flow Design: The valve is internally balanced, allowing it to operate efficiently in both flow directions (bi-flow) while ensuring stable regulation across a wide range of pressure differentials.

• Stepper Motor Precision: Features a high-resolution stepper motor that provides precise positioning of the valve cone, enabling extremely fine adjustments to the refrigerant mass flow.

• Advanced Metallurgy: Incorporates bi-metal connections (steel/copper), which allows for direct soldering to copper piping while maintaining the structural integrity and corrosion resistance of the stainless steel valve body.

• Standardized Electrical Interface: Equipped with a standard 4-pin M12 male connector, facilitating a secure and moisture-proof connection to external drivers or controllers.

• Environmental Protection: The actuator and electrical housing are rated IP67, providing total protection against dust and temporary immersion, which is critical for valves mounted in damp evaporator sections or outdoor units.

Technical Specifications

Technical FAQs

How does the bi-metal connection benefit the installation process?

The bi-metal connectors on the 034G1706 feature a stainless steel sleeve with a copper outer layer. This allows technicians to perform standard copper-to-copper brazing without the need for specialized flux or complex procedures typically required for stainless steel, significantly reducing the risk of leaks at the joints.

What type of controller is required to operate the ETS 50?

The 034G1706 requires a bipolar stepper motor driver (such as a Danfoss EKD 316 or similar electronic controller). The driver must be capable of providing the correct current and step pulses to accurately position the valve based on pressure and temperature sensor feedback.

Can this valve be used for both cooling and heating cycles in a heat pump?

Yes. The ETS 50 series is designed for bi-flow operation. It can effectively regulate refrigerant flow in both directions, making it an ideal choice for reversible heat pump systems where the valve must function as the expansion device during both heating and cooling modes.

Engineering & Installation Guide

• Brazing Protocol: When soldering the 1 1/8 inch ODF connections, it is critical to use a wet cloth or heat-sink paste to wrap the valve body. Excessive heat transfer to the internal stepper motor or the valve seat can cause permanent damage to the motor windings or calibration.

• Mounting Orientation: The valve should ideally be mounted with the actuator pointing upwards (within 90 degrees of vertical). This prevents compressor oil or liquid refrigerant from pooling in the actuator housing, ensuring the longevity of the stepper motor assembly.

• Electrical Shielding: Use a shielded M12 cable for the electrical connection, especially in panels containing variable frequency drives (VFDs). Proper shielding prevents electromagnetic interference from causing "lost steps" in the motor, which would result in inaccurate superheat control.