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ASCO 551 Solenoid Valves (Spool) 5/2, ¼”, Brass (15/16 Pilots) – Hazardous Area Valves Ex d, Ex mb, Ex e mb, Ex ia, NEMA

ASCO 551 Solenoid Valves (Spool) 5-2, ¼”, Brass (15-16 Pilots) – Hazardous Area Valves Ex d, Ex mb, Ex e mb, Ex ia, NEMA

ASCO 551 – Pilot Operated or Air Operated Spool Solenoid Valves For Hazardous Areas & Potentially Explosive Atmospheres

ASCO 551 hazardous area solenoid valves are pilot operated or air operated spool type valves suitable for hazardous areas installation with international classifications including ATEX, UL, CSA and other local approvals on request.

5/2  Way Solenoid Valve

NC – Normally Closed Valve

NO – Normally Open Valve

Via ASCO Numatics FASTSHIP and SAMEDAY Express Delivery Service we are able to deliver 2,000+ ASCO valves from stock direct to you.

T&D are an Authorised UK Distributor for ASCO Numatics, part of Emerson Industrial Automation.

 

ASCO 551 SOLENOID VALVES

  • The ASCO monostable spool valves in conformity with IEC 61508 Standard (2010 route 2H version) have TÜV certified with integraty levels: SIL 2 for HFT = 0 / SIL 3 for HFT = 1
  • All the exhaust ports of this spool valve are connectable, providing better environmental protection, particularly recommended for sensitive areas such as clean rooms, and applications in the pharmaceutical and food processing sectors
  • The solenoid valve offers environmental protection against the ingress of liquids, dusts or any other foreign matter (environmentally-protected construction)
  • Can be externally piloted (external air pilot supply) to convert valve to zero minimum operation by flipping a gasket
  • The solenoid valves satisfy all relevant EC Directives

Differential Pressure :    2 – 10, 4 bar [1 bar = 100kPA]

Flow (Qv at 6 bar): 860 l/min (ANR)

Fluids Temperature Range (TS) Valve Seal Materials
air, inert gas, filtered -40°C to +60°C VMQ (silicone) + PUR Polyurethane

ASCO 551- valve FLUID CONTACT COMPATIBILITY

ASCO 551 Solenoid Valve
Body, end covers Brass
Spool Valve Internal Parts Brass, Stainless Steel, POM
Seals NBR
Core tube Stainless Steel
Core and plugnut Stainless steel
Core Spring Stainless Steel
Top Disc PA
Disc Holder POM
Cartridge (Low Power) Welded, packless AISI 430
Seat Brass
Seat Insert POM
Shading Coil Copper
Rider Ring (Low Power) PTFE (NF/WSNF Solenoids only)

ASCO 551 – valve ELECTRICAL CHARACTERISTICS

Valve Coil Insulation Class : F

Electrical Safety : IEC 335

Standard Valve Voltages : DC (=) 24V – 48V

AC (~) 24V – 48V – 115V – 230V/50Hz; other voltages and 60Hz are available on request

ASCO 551 –  VALVE SPECIFICATIONS – AIR OPERATED

Pipe size™™™™ Orifice size Flow coefficient kV Operating pressure differential (bar) Prefix option ASCO Catalogue number™
(mm) (m3/h) (i/min) Min Max (PS)
air (*)
* ~ = ~/=
Solenoid Air pilot operated – spring return (monostable)
1/4 6 0.75 12.5 0 / 2 10 10 BP ASCO *551A419
1/4 6 0.75 12.5 0 / 2 10 10 BP ASCO *551G419
1/4 6 0.75 12.5 0 / 2 10 10 LP ASCO *551A319
1/4 6 0.75 12.5 0 / 2 10 10 LP ASCO *551G319
Solenoid Air pilot operated and return (bistable)
1/4 6 0.75 12.5 0 / 2 10 10 BP ASCO *551A420
1/4 6 0.75 12.5 0 / 2 10 10 BP ASCO *551G420
1/4 6 0.75 12.5 0 / 2 10 10 LP ASCO *551A320
1/4 6 0.75 12.5 0 / 2 10 10 LP ASCO *551G320
 *Select 8 for NPT ANSI 1.20.3 or select G for ISO G (228/1)

ASCO 551 – VALVE OPTIONS

  • Valves configured for external pilot air supply, TPL 20547
  • Other pipe threads are available on request
  • Ex mb/mD (prefix “PV”) solenoid can be supplied with various cable lengths
  • Compliance with “UL”, “CSA” and other local approvals available on request
  • 1/2″ NPT (prefix “T”) and M20 x 1.5 (prefix “ET”) conduits (aluminium or 316 SS) available for steel solenoid housing

ASCO SOLENOID VALVES – ATEX, IEC EX & NEMA hazardous area CERTIFIED

ASCO Valves

ASCO Solenoid Valves For Hazardous Area Oil, Gas & Petrochem Industries (ATEX & IECEx) – call T&D for sales, technical and specification support on all ASCO valves.

Hazardous Area Equipment Certification - ATEX (Zone 1 Zone 2), IEC Ex, NEMA (Div 1 Div 2) & Explosion Protection

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Hazardous Area Certification

ATEX (Zone 1 Zone 2), IEC Ex, NEMA (Div 1 Div 2) & Explosion Protection

➡ Did you know?  T&D supply ATEX hazardous area certified Analytic Gas Heated Hoses.

➡ Did you know? T&D distribute Hazardous Area Instrumentation Equipment as Approved Vendors to global oil and gas operators and their EPC’s.

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Data Sheets