ASCO 553 Series Solenoid Spool Valve

Brand: ASCO

The ASCO Series 553, also known as 8553, is a line of 1/2" 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 ½-inch NPT and BSP connections.

It is suitable for the harsh conditions found in chemicals, refining, food & beverage applications, and life science processing.
  • 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 vent to spring side of the actuator to exhaust, preventing corrosion
  • Single- and dual-solenoid constructions are available that mount in any position
  • Compatible to Functional safety loop up to SIL 3
  • All ports of NAMUR on the same side for better water and DUST protection
  • Available with all explosion-proof solenoids: Ex d, Ex mb, Ex ia/Ib, Ex e mb, NEMA



Body Material

  • Stainless Steel, Aluminum, Brass


  • From 2.0 Cv to 6.0 Cv, from 1.73 to 5.19 Kv


  • 3-Way - 3/2 Normally Closed, 4-Way - 5/2

Maximum Differential, Maximum Operating Pressure

  • Vacuum to 150 psig


  • Air, Inert Gas

Operating Environment

  • Corrosive, Hazardous, Indoor, Outdoor

Pipe / Port Size

  • 1/2

Port Type

  • G ISO 228 / 1-G BSPP, Female NPT

Standards & Regulations

  • ATEX Zone 1-21, ATEX Zone 2-22, Class I, Div. 1, Class II, Div. 1, IP65, SIL, Typical 1, Typical 2, Typical 3,Typical 3S, Typical 4, Typical 4X, Typical 6, Typical 6P, Typical 7, Typical 9, UL

Valve Actuation

  • Solenoid - Air Pilot


  • 24 AC, 110 AC, 120 AC, 220 AC, 480 AC, 6 DC, 12 DC, 24 DC, 120 DC, 240 DC / 50, 60
show more