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.
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)
