Product Overview

The ETS 50 (034G1708) is a high-precision, electronically operated expansion valve (EEV) engineered for the exact regulation of refrigerant mass flow in industrial air conditioning and refrigeration systems. As a core component of the Danfoss ETS series, the Danfoss 034G1708 (034G1708) utilizes a bipolar stepper motor to provide high-resolution needle positioning. This precision is vital for maintaining stable superheat (SH) control and optimizing the energy efficiency of high-capacity chiller and heat pump units. Featuring a symmetrical 7/8 inch x 7/8 inch ODF bi-metal connection, this valve is designed for seamless integration into B2B thermal management loops where reliability and fast response times are non-negotiable.

Technical Configuration

The technical architecture of the 034G1708 is characterized by a straightway design and a balanced valve assembly, ensuring consistent flow characteristics in both directions (bi-flow capable). It is equipped with a standardized M12 4-pin male electrical connector, providing a secure, vibration-resistant interface for electronic control signals. The bi-metal connection material (steel/copper) is a specific engineering choice that facilitates easy soldering to copper piping while protecting the internal stepper motor from excessive thermal conduction. With an IP67 enclosure rating, the actuator is fully protected against moisture and dust, making it suitable for environments with frequent defrost cycles or heavy condensation.

Technical Specifications

Technical FAQs

What are the advantages of the M12 electrical connection?

The M12 4-pin connector is an industry-standard interface that ensures a hermetic, moisture-proof electrical link. It simplifies maintenance by allowing for quick-disconnect cabling and prevents the common "wicking" effect where moisture travels through wire insulation into the motor housing.

Can the 034G1708 be used in reversible heat pump systems?

Yes, the ETS 50 series features a balanced needle design that supports bi-flow operation. It maintains the same high degree of mass flow accuracy regardless of the refrigerant direction, eliminating the need for external check-valve piping.

Is this valve compatible with modern low-GWP refrigerants?

The 034G1708 is compatible with most standard HFC and HCFC refrigerants, as well as several low-GWP blends. Always verify that the specific refrigerant and oil type are listed in the Danfoss Coolselector software for the given operating pressures.

Engineering & Installation Guide

• Thermal Protection Protocols: During the brazing process, it is critical to wrap the valve body in a wet cloth to keep the temperature below 100 Celsius. Failure to do so can permanently damage the internal magnets of the stepper motor and the PEEK valve seat.

• Cable Routing (M12): When installing the M12 cable, ensure the connector is hand-tightened to ensure the IP67 seal. Always create a "drip loop" in the cable before it enters the valve to prevent water from accumulating at the electrical interface.

• Controller Initialization: Upon initial commissioning, the EEV controller must perform an initialization sequence (approx. 2625 steps) to establish the fully closed position. This ensures the valve's logic is synchronized with its physical mechanical state to prevent superheat hunting.