ETS 50 (034G0508) Danfoss Electric Expansion Valve

Product Overview

The ETS 50 (034G0508) is a high-precision, electronically operated expansion valve (EEV) engineered for superior refrigerant mass flow control in air conditioning and refrigeration systems. As a critical component in high-efficiency B2B thermal management, the Danfoss 034G0508 (034G0508) utilizes a bipolar stepper motor to provide precise needle positioning, which is essential for maintaining optimal superheat (SH) and enhancing energy efficiency. Its native bi-flow capability makes it an ideal solution for heat pump applications, where it provides equally accurate regulation in both heating and cooling modes. By integrating this valve, facility operators can significantly reduce compressor wear and prevent liquid slugging in high-capacity chiller and evaporator units.

Technical Configuration

The technical architecture of the 034G0508 is centered on a balanced internal assembly that ensures linear flow characteristics across its entire operating range. The valve is driven by a precision bipolar stepper motor that interprets electronic pulses from a controller to modulate the valve opening with high resolution. This configuration features a factory-integrated 2 meter (6.6 ft) cable, providing a robust electrical connection rated to IP67 standards for protection against dust and moisture ingress. The hermetically sealed design is compatible with a wide range of refrigerants, including R410A and R134a, making it a versatile choice for modern industrial HVAC-R systems requiring fast response times and stable pressure regulation.

Technical Specifications

Technical FAQs

How does the Bi-flow design benefit heat pump systems?

The bi-flow design of the 034G0508 ensures that the valve maintains identical flow characteristics in both directions. This eliminates the need for separate expansion valves and bypass check valves in reversible heat pump circuits, simplifying the piping architecture and reducing potential leak points.

What type of control signal is required for the 034G0508?

This valve requires a bipolar stepper motor driver (such as a Danfoss EKD or EKE controller) capable of providing the correct phase current (typically 100 mA RMS) and step rate. It is not compatible with standard 0-10 V or 4-20 mA direct analog signals without a dedicated EEV driver.

What is the significance of the IP67 enclosure rating?

The IP67 rating indicates that the actuator and cable assembly are completely dust-tight and protected against temporary immersion in water. This is vital for refrigeration applications where heavy condensation or ice buildup is common.

Engineering & Installation Guide

• Brazing Protection: When installing the valve, it is mandatory to wrap the valve body in a wet cloth to ensure the internal temperature does not exceed 100 Celsius. Excessive heat can permanently damage the precision stepper motor and the internal needle seals.

• Mounting Orientation: For optimal oil management and to prevent refrigerant pooling in the motor housing, the ETS 50 should be mounted with the actuator in a vertical position (upward). Ensure the 2 meter cable is routed through a drip loop to prevent water from traveling down the cable into the actuator seal.

• Calibration and Startup: Upon initial power-up, the controller must perform a full stroke initialization (typically 2625 steps) to calibrate the zero position. Ensure the controller is programmed with the correct step rate (typically 52 steps per second) to prevent motor stall or missed steps during high-speed regulation.