The ASCO Series 551 features a range of compact solenoid spool valves, perfectly suited for managing air or inert gas in demanding settings. These valves combine tough T-seals and adaptable O-rings to ensure a tight seal and resistance to contaminants, while supporting extended operational life through multiple million cycles. Available in anodized aluminium, brass, and stainless steel, the 551 Series offers ¼-inch NPT and BSP connections. This makes them an ideal choice for challenging conditions in the chemical, refining, food and beverage industries, as well as in life science processes.

Key features and benefits of ASCO™ 551 Solenoid Spool Valves

Key Features

The ASCO™ 551 series is designed to meet a wide range of international safety standards, including ATEX, IECEx, NEPSI, CUTR, KOSHA, UL, CSA, and InMetro. These certifications ensure that the valves can be safely operated in hazardous environments worldwide, making them suitable for a broad range of industrial applications.

Key Features

All ports of the NAMUR configuration are positioned on the same side, which provides an added layer of protection against water and dust ingress. This design feature helps to extend the operational life of the valve, particularly in challenging environments where exposure to moisture and particulate matter is a concern.

Key Features

The ASCO™ 551 series is available with a range of explosion-proof solenoids, including Ex d, Ex mb, Ex ia/Ib, Ex e mb, and NEMA-rated models. These solenoids are built to prevent ignition in hazardous atmospheres, ensuring safety in industries where explosive gases, dust, or vapours may be present.

Valve Specifications
Valve Actuation:	Solenoid - Air Pilot
Body Material:	Brass, Stainless Steel, Aluminium
Media:	Air, Inert Gas
Pipe / Port Size:	1/4 "
Port Type:	G ISO228/1-G BSPP, NPTF
Function:	3 way - 3/2 Normally Closed, 4 way - 5/2, 4 way - 5/3 - Closed Center, 4 way - 5/3 - Open Center
Flow:	From 0.5 Cv to 1.0 Cv, From .43 to .86 Kv
Voltage:	24 AC, 110 AC, 120 AC, 220 AC, 480 AC, 6 DC, 12 DC, 24 DC, 120 DC, 240 DC \| 50, 60
Operating Environment:	Corrosive, Hazardous, Indoor, Outdoor
Temperature Range:	-60°C to 80°C

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DATASHEET

ASCO Series 551 Solenoid Valves are used to control the flow of air and inert gas in a wide range of industrial applications, including hazardous and corrosive environments.

ASCO Series 551 Solenoid Valves come in various materials such as brass, stainless steel, and aluminum to suit different operational needs and environmental conditions.

These solenoid valves are available in multiple voltage options, including 24 AC, 110 AC, 120 AC, 220 AC, 480 AC, and DC variations like 12 DC, 24 DC, and 240 DC.

Yes, ASCO 551 Solenoid Valves are ATEX and SIL certified, making them ideal for hazardous environments, including ATEX Zone 1-21 and Zone 2-22.

The ASCO Series 551 operates with a solenoid air-pilot actuation system, ensuring efficient and precise control of valve operations.

The ASCO Series 551 Solenoid Valves offer a port size of 1/4" and support both G BSPP and NPTF port types for versatile installation.

The flow capacities of ASCO Series 551 Solenoid Valves range from 0.5 Cv to 1.0 Cv, or from 0.43 to 0.86 Kv, allowing for flexible flow control in various applications.

Yes, the ASCO Series 551 can operate in temperatures ranging from -60°C to 80°C, making them ideal for extreme temperature environments.

The ASCO Series 551 Solenoid Valves can handle a maximum differential operating pressure of vacuum to 150 PSIG, making them versatile for different pressure requirements.

The ASCO Series 551 offers multiple valve functions, including 3-way (3/2 normally closed) and 4-way configurations (5/2, 5/3 - Closed Center, Open Center).

Yes, the ASCO Series 551 is suitable for both indoor and outdoor use, with an ingress protection rating that includes standards like Type 4, Type 4X, and Type 6P.

Please feel free to request information and advice using the form below or call us on 0151 547 1221

ASCO™ Series 551 Solenoid Spool Valves