DANFOSS EV260B 032U8057 Proportional NC Solenoid Valve

Product Overview

The 032U8057 (032U8057) is a high-precision 2/2-way proportional solenoid valve from the Danfoss EV260B series, engineered for stepless flow regulation in industrial automation and process control. Utilizing a 6 mm orifice and a specialized proportional actuator, the 032U8057 allows for infinite adjustment of the flow rate based on the electrical input signal, rather than simple on/off operation. The valve body is constructed from durable brass with high-grade PTFE sealing material, making it suitable for a variety of fluids including water, oil, and compressed air. Designed for high-reliability applications, this Normally Closed (NC) valve ensures precise control in dosing systems, cooling loops, and mixing applications where maintaining a specific flow or pressure is critical to process integrity.

Technical Configuration

The EV260B series hardware is optimized for linear flow characteristics and industrial endurance:

• Proportional Operation: Unlike standard solenoid valves, the 032U8057 utilizes a specialized B-type actuator (13.5 mm system) that translates variable electrical current into proportional plunger travel.

• Normally Closed (NC) Function: The valve remains closed when de-energized, providing a fail-safe position for critical fluid circuits.

• PTFE Sealing Technology: High-performance PTFE seals offer excellent chemical resistance and thermal stability, allowing for reliable operation across diverse fluid groups.

• Servo-Operated Mechanics: Employs a servo-driven principle that utilizes the differential pressure of the medium to assist in valve actuation, ensuring smooth and stable flow regulation.

• Directional Accuracy: Features an embossed 1-way arrow on the brass body to ensure correct single-flow installation, preventing backflow issues and mechanical chatter.

Technical Specifications

Technical FAQs

Does this valve require a minimum differential pressure to operate?

Yes. As a servo-operated valve, the 032U8057 requires a minimum differential pressure of 0.5 bar (approx. 7.25 psi) to function correctly. If the system pressure is below this threshold, the valve may not open fully or provide stable proportional control.

What type of signal is required to control the proportional function?

The 032U8057 is typically controlled via a Pulse Width Modulation (PWM) signal or a 4-20 mA / 0-10V signal through a dedicated Danfoss signal converter (such as the ECI electronic controller). The variable current changes the magnetic force to position the plunger accurately.

Is this valve suitable for high-viscosity fluids?

The EV260B series is optimized for clean fluids. While it can handle light oils, high-viscosity liquids may affect the response time and the linearity of the proportional control. For maximum precision, the fluid should be free of debris that could interfere with the 6 mm orifice or the servo mechanism.

Engineering & Installation Guide

• Fluid Filtration: To protect the 6 mm orifice and the sensitive proportional mechanism, it is highly recommended to install a 50-micron filter upstream of the valve. Particles in the fluid can cause the valve to "stick" or prevent it from sealing completely in the NC position.

• Orientation and Mounting: For optimal performance, mount the valve with the coil in a vertical position (actuator facing up). This prevents sediment from settling in the armature tube and reduces wear on the internal guiding parts during proportional movement.

• PID Tuning: When integrating the 032U8057 into a control loop, ensure the PID parameters of your PLC or controller are tuned to account for the servo-operated response time. Excessive "gain" in the control signal can cause the valve to hunt or oscillate, potentially leading to premature mechanical fatigue.