Product Overview

The Danfoss EV250B series represents a specialized class of 2/2-way forced-lift (assisted lift) solenoid valves, engineered specifically to bridge the gap between direct-acting and standard pilot-operated designs. This hardware excels in systems characterized by fluctuating pressures, very low differential pressures, or vacuum conditions where a standard valve would fail to remain open. By mechanically linking the actuator to the diaphragm, the EV250B ensures reliable opening and closing from 0 bar up to 10 bar. This makes it an ideal solution for gravity-fed systems, closed-loop cooling circuits, and industrial vacuum applications. Its robust construction ensures precise fluid regulation for neutral media such as water, oil, and compressed air, providing the mechanical certainty required in complex process automation where pressure stability cannot be guaranteed.

Core Technical Advantages

Forced-Lift Mechanical Linking

The internal design features a mechanical connection between the solenoid armature and the diaphragm. When energized, the coil forces the valve to open regardless of the system's differential pressure. This "assisted lift" mechanism provides the zero-pressure functionality of a direct-acting valve but with the high flow rates (Kv values) typically reserved for larger pilot-operated units.

Anti-Corrosive DZR Brass Body

Eaton utilizes Dezincification Resistant (DZR) brass for the EV250B valve body as standard. This high-grade material prevents the selective leaching of zinc in aggressive water conditions, ensuring the valve body maintains its structural integrity and sealing surfaces even in environments with brackish water or high mineral content.

High-Vacuum Performance

The specialized sealing architecture allows the EV250B to operate effectively in vacuum systems down to 99% (10 mbar). The forced-lift action ensures that the valve does not "chatter" or partially close under low-flow conditions, providing a stable and airtight path for vacuum-assisted processing and packaging lines.

Technical Specifications

Engineering Installation Guide

Upstream Filtration Requirements

Because the EV250B utilizes a diaphragm for its assisted lift mechanism, it remains sensitive to large particulates. Install a 50 to 100-micron strainer upstream of the valve inlet. This prevents debris from interfering with the diaphragm’s movement and ensures the valve achieves a bubble-tight shutoff.

Mounting Orientation for Vacuum

For vacuum applications, always install the valve with the flow direction following the arrow on the body. While the forced-lift mechanism allows for various mounting angles, we recommend installing the coil in the vertical upright position. This orientation prevents condensate or particles from collecting in the armature tube, which can impair response time.

Coil and Electrical Termination

Ensure you utilize the correct Danfoss "Clip-on" coil for your specific voltage (24V DC, 110V AC, or 230V AC). Always use a plug with a functional gasket to maintain the IP65/IP67 rating, especially in environments prone to washdowns or high humidity.

Engineering Advantages

The EV250B excels in versatility, functioning perfectly in both high-pressure and zero-pressure scenarios. Its high-flow design allows for smaller pipe sizing compared to direct-acting valves of similar capacity, reducing overall system weight and cost. The use of EPDM seals makes it highly resistant to heat and common industrial cleaning agents, while the FKM option provides the necessary chemical resistance for oil and air systems. By utilizing the EV250B, procurement specialists secure a "universal" valve that eliminates the need for separate inventories for pressurized and gravity-fed lines, streamlining spare parts management and ensuring long-term operational uptime in demanding industrial facilities.

Delivery & Logistics

Delivery time: 3-5 days when payment finish.

Shipping Carriers: BY DHL/FEDEX/UPS.

Packaging: We utilize moisture-barrier anti-static bags and reinforced industrial crating. Each EV250B is delivered in its original factory-sealed box to guarantee that the precision mechanical lift assembly and electrical coils arrive in perfect condition.

Technical FAQs

Q1: When should I choose the EV250B over a standard pilot-operated valve like the EV220B?

A1: Select the EV250B if your system has very low pressure (less than 0.1 bar) or if the pressure fluctuates significantly. Standard pilot-operated valves require a minimum pressure differential to stay open, whereas the EV250B stays open mechanically.

Q2: Is this valve suitable for steam applications?

A2: For low-pressure steam, the EPDM version can handle up to 120°C. For high-pressure steam, we recommend dedicated steam valves with specialized seals to ensure long-term durability.

Q3: Can the EV250B handle aggressive media?

A3: The DZR brass body is highly resistant to corrosive water. For more aggressive chemicals, check the FKM seal compatibility. If the chemical is incompatible with brass, a stainless steel series would be required.

Q4: What is the benefit of the "Clip-on" coil system?

A4: The Danfoss Clip-on system allows for tool-free coil replacement. You can swap the electrical component without opening the fluid system, which drastically reduces maintenance time and prevents system contamination.