ETS 50 (034G1705) Danfoss Electric Expansion Valve

Product Overview

The ETS 50 (034G1705) is a sophisticated electronically operated expansion valve (EEV) designed for precise refrigerant mass flow regulation in high-capacity air conditioning and refrigeration systems. As a critical component in the Danfoss ETS series, the Danfoss 034G1705 (034G1705) utilizes a high-resolution bipolar stepper motor to provide accurate needle positioning. This precision is essential for maintaining optimal superheat (SH) and enhancing the energy efficiency of the entire thermal loop. Engineered for B2B industrial applications, this valve features a bi-metal connection (steel/copper) to ensure maximum reliability and leak-proof performance in demanding chiller and heat pump configurations.

Technical Configuration

The technical architecture of the 034G1705 is defined by a straightway flow direction and a balanced internal assembly that provides linear flow characteristics. The valve is equipped with a professional-grade M12 4-pin male electrical connection, facilitating a secure and standardized interface with electronic controllers. Its bi-metal solder ODF connections (7/8 in inlet and 1 1/8 in outlet) allow for seamless integration into diverse piping systems while minimizing heat transfer to the valve body during installation. The actuator housing is rated at IP67, providing a hermetic seal against dust and water ingress, which is vital for systems operating under heavy condensation or extreme ambient conditions.

Technical Specifications

Technical FAQs

What are the benefits of the bi-metal connections on the 034G1705?

The bi-metal (steel/copper) design allows for standard copper-to-copper soldering at the pipe ends while the steel portion protects the internal valve mechanism. This significantly reduces the risk of overheating the precision motor during the installation process.

What type of control signal is required for the M12 4-pin connector?

The 034G1705 requires a bipolar stepper motor driver (such as the Danfoss EKD or EKE series) that provides a phase current of 100 mA RMS. The M12 4-pin configuration is the industry standard for ensuring a moisture-proof electrical link.

Can this valve be used in reversible heat pump systems?

Yes, the ETS 50 series features a balanced needle design that supports bi-flow operation, providing the same high-accuracy regulation regardless of the refrigerant flow direction, making it ideal for heating and cooling cycles.

Engineering & Installation Guide

• Brazing Protocol: Even with bi-metal connections, it is mandatory to wrap the valve body in a wet cloth during soldering. Ensure the internal temperature remains below 100 Celsius to protect the high-resolution stepper motor magnets and the internal PEEK valve seat.

• M12 Connection Security: When attaching the M12 4-pin cable, ensure the connector is hand-tightened to maintain the IP67 rating. Avoid using pliers, which can damage the threaded housing. A drip loop should be formed in the cable to prevent moisture from tracking directly into the electrical port.

• Controller Initialization: Upon first power-up, the controller must perform a reference run (overdrive) of at least 2625 steps to establish the "zero" fully closed position. Failure to calibrate the valve properly can result in hunting, unstable superheat, or potential liquid slugging at the compressor.