Double Coil ASCO Solenoid Valve EF551H402MO G1/4

Product Description:

This line of 1/4-inch single-coil solenoid valves employs a pilot-operated working mechanism. A low-power solenoid coil controls the pilot valve, which subsequently utilizes the medium’s pressure difference to actuate the primary spool. This approach enables a small coil to manage relatively large flow rates, making it ideal for applications requiring frequent switching.

Featuring a single-coil configuration, the valve operates by energizing and de-energizing the single solenoid coil. Upon de-energization, the valve automatically returns to its default position via spring force. This setup ensures simple, reliable control, particularly suited for use with single-acting actuators.

The valve body is equipped with standardized 1/4-inch NPT or BSP threaded ports. Its compact construction allows for easy installation within equipment that has limited space. The small footprint makes it perfect for integration into control panels or pneumatic systems across various automation devices.

Available in brass or 316L stainless steel, the valve bodies cater to diverse industrial needs. Brass versions provide excellent pressure resistance up to 25 bar, suitable for general industrial environments. Stainless steel variants offer superior corrosion resistance, ideal for demanding sectors such as chemical processing, food production, and marine applications.

These valves incorporate a unique sealing method that combines a T-shaped seal with a flexible O-ring. This design achieves bubble-tight sealing and outstanding dirt resistance. The robust sealing structure withstands millions of operational cycles, ensuring a long service life and high reliability.

Equipped with solenoid coils that consume minimal power—some models operating between 1.5W and 2.5W—these valves contribute to significant energy savings. They support a variety of voltage options, including DC 24V and AC 220V, making them compatible with PLCs and other automation control systems. Additionally, protection ratings of IP65 and IP67 provide dust-tight and water jet resistance, suitable for harsh industrial conditions.

Designed for speedy operation, these valves boast an opening time of ≤15 ms and a closing time of ≤20 ms. Their robust construction guarantees a design life exceeding 5 million cycles, with some premium models capable of surpassing 100 million cycles, thereby fulfilling the demands of high-frequency start-stop usage.

Standard features include a manual reset device or manual operator, facilitating easier equipment setup, maintenance, and emergency manual operation. This feature allows valve operation without electrical input, enhancing overall system safety and ease of upkeep.

The valves are versatile in installation methods, supporting direct inline piping connections and direct mounting onto pneumatic actuators with standard NAMUR interfaces. There are no restrictions on installation orientation, allowing flexible placement according to space availability at the site.

Applications:

These systems are extensively applied in automated production environments, including packaging machinery, assembly equipment, and material handling setups. They are designed to control various actuators such as single-acting cylinders and pneumatic grippers. Their functionalities encompass actions like clamping, positioning, and pushing, enhancing the efficiency and precision of production lines.

Serving as essential components within pneumatic control architectures, these devices facilitate switching and directional control in equipment like air compressor stations, pneumatic tools, and compressors. The standard 1/4-inch port size is optimum for small to medium pneumatic circuits. With typical flow rates ranging from 700 to 860 liters per minute at 6 bar pressure, they adequately fulfill the requirements of most pneumatic actuators.

In pulse jet dust collector systems, these valves manage the rapid release of compressed air necessary for on-line filter cleaning. Additionally, they are instrumental in automating valve operations within environmental protection facilities, including wastewater treatment plants and exhaust gas purification systems, thereby supporting sustainable industrial processes.

These valves are well-suited for various energy sector applications such as controlling boiler feed valves, ensuring safety shut-off in gas pipelines, and managing burner controls. Certain models come with ATEX and IEC Ex explosion-proof certifications, making them safe for use in hazardous industrial environments typical of petrochemical plants and propane control systems.

Models with stainless steel construction comply with stringent sanitary standards, making them ideal for applications demanding high levels of cleanliness. These include food processing, beverage bottling, and pharmaceutical equipment. To support food-grade media and cleaning protocols, sealing materials are available in EPDM or Viton, ensuring compatibility with both operational and sanitization processes.

Within automotive production lines, these components are utilized in welding fixtures, painting machinery, and assembly stations to control pneumatic tools and auxiliary devices. Low-power variants are particularly advantageous for integration with PLC systems, addressing the automotive industry's requirements for high reliability and efficient cycle times.

Models certified with ATEX, IEC Ex, UL, and other international explosion-proof standards are designed for safe operation in flammable and explosive environments common in petrochemical and gas-related applications.

Certain valve models can function reliably in very low temperatures, down to –60°C. This capability makes them suitable for use in cold storage facilities, outdoor installations, and other applications subjected to extreme cold conditions.

High-temperature variants are capable of handling steam and hot water systems, tolerating media temperatures up to 99°C (210°F), ensuring performance in thermal fluid control scenarios.

For mildly acidic, alkaline, or otherwise corrosive fluid applications, stainless steel-bodied valves combined with corrosion-resistant sealing materials provide durable and reliable control solutions.

Support and Services:

ASCO solenoid valves are designed to provide reliable and efficient control of fluid and gas flow in a wide range of industrial applications. For technical support, users can access detailed product documentation, including installation guides, operation manuals, and maintenance instructions to ensure optimal performance.

Our technical support team is equipped to assist with product selection, troubleshooting, and application advice to help you maximize the value of your ASCO solenoid valve. We recommend verifying compatibility with your system requirements and following all safety guidelines during installation and operation.

In addition to standard support, ASCO offers repair and maintenance services performed by certified technicians to extend the life of your solenoid valves. Replacement parts and accessories are also available to keep your equipment running smoothly.

For complex applications or custom solutions, ASCO provides engineering support to tailor solenoid valve configurations that meet specific operational needs. Comprehensive training resources and webinars are available to enhance user knowledge and ensure proper handling of the products.

Packing and Shipping:

The ASCO Solenoid Valve is carefully packaged to ensure maximum protection during transit. Each valve is securely placed in a custom-fitted box with protective padding to prevent damage from shocks and vibrations. The packaging materials are designed to safeguard the product from moisture, dust, and external impacts.

For shipping, ASCO Solenoid Valves are shipped in sturdy outer cartons labeled with handling instructions and product information. Multiple units are palletized and shrink-wrapped to ensure stability and ease of handling during transportation. We partner with reliable carriers to ensure timely and safe delivery to your location.