Home » Emerson / ASCO Valves » ASCO Valve 8551 1/4″ Air Pilot Solenoid Spool Valves
ASCO Valve 8551 1/4" Air Pilot Solenoid Spool Valves
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.
Prices Starting at $160.00
Shop ASCO 8551 Valves
ASCO 8551 Valve Specs
- 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
ASCO 8551 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)
ASCO 8551 Valve Documents
Related Articles To ASCO 8551 Valves
Understanding The New Lead-Free Water System Regulations & Choosing Valves To Comply
Understanding The New Lead-Free Water System Regulations & Choosing Valves To Comply By Rob Lindquist, P.E. Product Marketing Manager, ASCOAnne-Sophie Kedad-Chambareau Director of Marketing, Process,
Effective Compliance with IEC 61508 When Selecting Solenoid Valves for Safety Systems
Effective Compliance with IEC 61508 When Selecting Solenoid Valves for Safety Systems By David Park and George Wahlers Introduction Regulatory modifications in 2010 have raised
How Some Supervisory and Leakage Currents Can Affect Today’s Low-Power Solenoid Valves
How Some Supervisory & Leakage Currents Can Affect Today’s Low-Power Solenoid Valves By Manny Arceo and Jack Haller Introduction As fluid automation users embrace the
How New Low-Power Solenoid Valve Technology Changes The Game
How New Low-Power Solenoid Valve Technology Changes The Game By Fabio Okada, Jack Haller, and Manny Arceo Introduction Process plants worldwide often place considerable reliance
Optimizing Power Management in Solenoid Valves
Optimizing Power Management in Solenoid Valves By Stephen Glaude – Vice President, Engineering Introduction Solenoid valves have been used for more than 100 years in
Breakthrough Solenoid Valve Technology for Upstream Oil and Gas Heating Equipment
Breakthrough Solenoid Valve Technology for Upstream Oil and Gas Heating Equipment by Bob Cadwell, Gerry Longinetti, and James Chiu A White Paper From ASCO Introduction