ETS 50 (034G1709) Danfoss Electric Expansion Valve

Product Overview

The ETS 50 (034G1709) is a high-resolution, electronically operated expansion valve (EEV) engineered for precision refrigerant mass flow control in industrial air conditioning and refrigeration systems. As a central component in high-efficiency thermal management, the Danfoss 034G1709 (034G1709) utilizes a bipolar stepper motor to provide accurate needle positioning, which is critical for maintaining stable superheat (SH) control and optimizing energy efficiency. This model features a straightway design with symmetric 1 1/8 inch ODF connections, making it a robust choice for B2B industrial chillers, heat pumps, and close-control units where fast response and high reliability are paramount.

Technical Configuration

The technical architecture of the 034G1709 is designed for seamless integration and long-term durability. It features bi-metal (steel/copper) solder connections that simplify the installation process while protecting the precision internal motor from excessive heat conduction. The electrical interface is a standardized M12 4-pin male connector, providing a vibration-proof and moisture-tight link to the electronic controller. Rated at IP67, the valve's enclosure is fully protected against dust and water ingress, ensuring reliable performance in environments with heavy condensation or frequent defrost cycles. The internal balanced needle design supports bi-flow operation, allowing for consistent flow regulation in both heating and cooling modes.

Technical Specifications

Technical FAQs

Why are bi-metal connections used on the 034G1709?

The bi-metal design allows for standard copper-to-copper brazing at the pipe ends, while the stainless steel portion acts as a thermal barrier, protecting the internal stepper motor and precision needle seals from high temperatures during soldering.

What control driver is required for this valve?

The 034G1709 requires a bipolar stepper motor driver (such as the Danfoss EKD or EKE series) that provides a constant current of approximately 100 mA RMS and is capable of driving 2625 steps for a full-stroke operation.

Can this valve be used in reversible heat pump systems?

Yes, the ETS 50 series features a balanced needle and cage design that ensures identical mass flow accuracy in both directions, eliminating the need for external check-valve loops in reversible circuits.

Engineering & Installation Guide

• Brazing Safety: During the installation process, it is mandatory to wrap the valve body in a wet cloth. Ensure the temperature of the valve housing remains below 100 Celsius to prevent permanent damage to the motor magnets and the internal PEEK seat.

• M12 Cable Installation: When connecting the M12 4-pin cable, ensure the nut is hand-tightened to compress the O-ring seal properly for IP67 integrity. Form a drip loop in the cable to prevent water from tracking directly into the electrical connector.

• Controller Calibration: Upon initial commissioning, the controller must perform an initialization run (overdrive) of at least 2625 steps to establish the mechanical "zero" (fully closed) position. Failure to calibrate will lead to inaccurate flow regulation and potential superheat hunting.