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ASCO™ 553 1/2
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.
ASCO™ 553 1/2" Solenoid Spool Valve


Valve Actuation
Solenoid - Air Pilot
Body Material
Stainless Steel, Aluminum, Brass
Air, Inert Gas
Pipe / Port Size
1/2 "
Port Type
3 way - 3/2 Normally Closed, 4 way - 5/2
From 2.0 Cv to 6.0 Cv, From 1.73 to 5.19 Kv
24 AC, 110 AC, 120 AC, 220 AC, 480 AC, 6 DC, 12 DC, 24 DC, 120 DC, 240 DC
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, IP65, SIL, Type 1, Type 2, Type 3,Type 3S, Type 4, Type 4X, Type 6, Type 6P, Type 7, Type 9, UL


  • 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
  • Compatible to Functional safety loop up to SIL 3
  • 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