ASCO Solenoid Valve EF8551A321MO stainless steel valve body

Product Description:

The ASCO 551, 553, and 531 Series are compact spool-type solenoid valves, each designed with specific parameters such as port size and flow range to suit different application scenarios. These valves are widely employed in industries requiring precise gas control, including chemical processing and the food & beverage sector. The following sections provide an in-depth overview of the key features and characteristics of each series.

1. 551 Series

Also identified as the 8551 Series, this collection features 1/4-inch 3-way and 4-way compact spool solenoid valves. They are engineered primarily for controlling air and inert gases in demanding environments, including hazardous and corrosive conditions.

• Key Parameters: Operating pressure ranges from vacuum up to 150 psi; medium temperature tolerance spans from -60°C to 80°C. The flow range is between 0.5 to 1.0 Cv (0.43 to 0.86 Kv). A variety of voltage options are available, encompassing DC (6VDC, 12VDC, 24VDC, etc.) and AC (24VAC, 110VAC, 220VAC, etc.), ensuring compatibility with diverse power supplies.
• Structure & Materials: The valve bodies come in anodized aluminum, brass, and optionally stainless steel. Port configurations include G ISO228/1, G BSPP, and NPTF, with 1/4-inch NPT and BSP threaded connections. Multiple functional modes such as 3/2 Normally Closed (NC), 4/2, 4/3 Center Closed (CC), and 4/3 Normally Open (NO) are supported. Installation is versatile, allowing single-coil or double-coil setups in any orientation.
• Core Advantages & Applications: The combination of durable T-seals and flexible O-rings contributes to excellent sealing efficacy and resistance to particulate contamination, facilitating stable operation across millions of cycles. This series holds certifications including ATEX, UL, and CSA for explosion-proof performance. Its robust design is particularly suited for the chemical, oil refining, food & beverage, and life sciences industries.

2. 553 Series

Known also as the 8553 Series, these valves feature a larger 1/2-inch port size with enhanced flow capabilities compared to the 551 Series. They maintain a focus on air and inert gas management within industrial settings.

• Key Parameters: Operating pressure extends from vacuum to 150 psi, with an improved flow range between 2.0 to 6.0 Cv (1.73 to 5.19 Kv). Voltage options mirror those of the 551 Series. The series complies with an IP65 protection rating and supports safety functional loops with SIL3 and below, ensuring high reliability.
• Structure & Materials: Valve bodies are constructed from aluminum, brass, or 316L stainless steel. Ports conform to G ISO228/1, G BSPP, and NPTF standards with 1/2-inch NPT and BSP threaded connections. Installation can be performed either on actuators using NAMUR interfaces per the VDI/VDE3845 standard, or directly on piping systems through threaded connections.
• Core Advantages & Applications: Features such as a pipeable exhaust port and side-aligned NAMUR ports enhance dust and water resistance. The valves are waterproof and explosion-proof with a low power consumption design, ideal for remote power supply contexts. These characteristics make the 553 Series well suited for demanding industrial environments that require higher flow rates, such as chemical processing and refining.

3. 531 Series

This series targets applications demanding safety and dependability, offering both explosion-proof and standard variants. It is predominantly used for actuator pilot control in chemical and hybrid industrial environments. A representative model is the SCG531C001MS.

• Key Parameters: The operating pressure range is from -0.95 bar to +10 bar, with ambient temperature tolerance from -10°C to +60°C. At 6 bar, the flow rate reaches 1150 L/min (ANR). The interface size is G1/4, with a port diameter of 6 mm and a flow coefficient of 0.95 m³/h. Common voltage ratings include 220VAC and 24VDC. Coil power consumption features 6 VA inrush and 3.5 VA holding power.
• Structure & Materials: This series utilizes black anodized aluminum for the valve body, combined with low-friction, non-sticking T-seals and polyamide for top covers and end caps. Internal parts are composed of acetal and aluminum. Electrical connections use either DIN or metal M12 standards. Installation is facilitated through NAMUR, with threaded exhaust ports designed to minimize impurity ingress.
• Core Advantages & Applications: An internal air circulation mechanism prevents moisture entry into actuator and valve components, reducing corrosion risks. The series meets EN60730 safety regulations and carries explosion-proof certifications such as ATEX and IECEx. Its high levels of cleanliness and operational stability make it an excellent choice for sectors with stringent environmental cleanliness requirements, including pharmaceuticals and food, as well as for actuator pilot control within chemical industries.

Technical Parameters:

Applications:

The ASCO Solenoid Valve is a highly versatile and reliable electromagnetic valve designed to meet the demands of various industrial and commercial applications. With a sturdy aluminium body material, this 2-way solenoid valve is capable of operating efficiently within a wide temperature range of -60°C to 80°C, making it suitable for environments with extreme temperature variations. Its plate type connection method and 1/4 caliber size ensure easy installation and compatibility with numerous piping systems.
One of the primary application occasions for the ASCO solenoid valve is in automated fluid control systems. Industries such as water treatment, HVAC, and pneumatic automation rely on electromagnetic valves like this to regulate the flow of liquids and gases accurately and swiftly. Thanks to its CE certification, users can be assured of its quality and compliance with international standards, which is crucial for safety-critical applications.
The ASCO solenoid valve is also widely used in scenarios requiring precise control of air or liquid flow, such as in manufacturing plants, chemical processing, and food and beverage production. Its ability to handle different pressure levels and temperatures makes it ideal for controlling the delivery of fluids in complex machinery and equipment. Additionally, the valve’s quick response time enhances operational efficiency and reduces downtime.
For maintenance and replacement purposes, the ASCO valve’s minimum order quantity of just one unit allows for flexibility and convenience. The packaging details can be customized according to client requirements, shipped securely in cartons to prevent damage during transport. With a supply ability of 5000 pieces per month and a delivery time of 1-7 work days after payment, customers can depend on timely fulfillment of their orders.
Payment terms including T/T, Western Union, and PayPal provide multiple options for buyers worldwide, facilitating smooth transactions. The price is negotiable, catering to different budgetary needs while maintaining product excellence. Overall, the ASCO solenoid valve is an excellent choice for anyone seeking a durable, efficient, and certified electromagnetic valve for diverse application occasions and scenarios.

Packing and Shipping:

The ASCO Solenoid Valve is carefully packaged to ensure it arrives in perfect condition. Each valve is enclosed in a protective plastic bag to prevent dust and moisture exposure, then placed in a sturdy, custom-designed cardboard box that provides cushioning and support during transit.
For shipping, the packaged valves are securely packed into larger cartons with appropriate padding materials to minimize movement and potential damage. All shipments are labeled with handling instructions and product information to facilitate smooth logistics and delivery.
We use reliable shipping carriers to ensure timely and safe delivery of the ASCO Solenoid Valve to your specified location. Tracking information is provided to keep you informed throughout the shipping process.