The ASCO Series 551, also known as 8551, is a line of 1/4" 3-way and 4-way compact solenoid spool valves that are ideal for controlling air or inert gas in challenging environments. The valves’ unique design combines hard T-seals and flexible O-rings that provide bubble-tight shutoff, dirt resistance, and multi-million cycle reliability. The 551 Series comes in anodized aluminum, brass, and stainless steel bodies with ¼-inch NPT and BSP connections. It is suitable for the harsh conditions found in chemicals, refining, food & beverage applications and life science processing.
Series 551 Solenoid Spool Valve Features
- Available in two versions, mounted directly to actuators with NAMUR interface per VDI/VDE 3845 or threaded to mount on the pipe
- Valve body in Aluminum, Brass, or Stainless steel 316L
- Exhaust ports are pipeable, providing better protection against harsh environments
- DIN, watertight, and explosion-proof solenoids are available for use in mission-critical and hazardous areas
- Low-power constructions are ideal for remote and alternative power locations
- Integral breather block vents to spring side of the actuator to exhaust, preventing corrosion
- Single- and dual-solenoid constructions are available that mount in any position
- Global Ex approvals; ATEX, IEC EX, NEPSI, CUTR, KOSHA, UL, CSA, InMetro
- All ports of NAMUR on the same side for a better water , DUST protection
- Available will all Explosion proof solenoids: Ex d, Ex mb, Ex ia/Ib, Ex e mb, NEMA
- Available in an arctic version, suitable for use in temperatures as low as -60°C
- Compact spool valve convertible from 3/2 to 5/2 with a single flow plate design (551 Series only)
Series 551 Solenoid Spool Valve Specifications
- Valve Actuation: Solenoid - Air Pilot
- Body Material: Brass, Stainless Steel, Aluminum
- 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
- Max Differential / Max Operating Pressure: Vacuum to 150 PSIG
- Operating Environment: Corrosive, Hazardous, Indoor, Outdoor
- Standards / Regulations: ATEX Zone 1-21, ATEX Zone 2-22, Class I Div 1, Class II Div 1, SIL, Type 1, Type 2, Type 3, Type 3S, Type 4, Type 4X, Type 6, Type 6P, Type 7, Type 9
- Temperature: -60°C to 80°C
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