ASCO 551 553 Solenoid Valves (Spool) 3/2 NC, ¼”-3/8”-1/2” Aluminium (15/16 Pilots) – Hazardous Area Valve Ex d, Ex mb, Ex e mb, Ex ia, NEMA
ASCO 551 553 – Pilot Operated Spool Solenoid Valves For Hazardous Areas & Potentially Explosive Atmospheres
ASCO 551 553 hazardous area solenoid valves are pilot operated spool type valves suitable for hazardous areas installation with international classifications including ATEX, UL, CSA and other local approvals on request.
3/2 – 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 551 553 SOLENOID VALVES
- The monostable spool valves in conformity with IEC 61508 Standard (2010 route 2H version) have TÜV (551 series) and EXIDA (551-553 series) certified with integrity levels: SIL 2 for HFT = 0 / SIL 3 for HFT = 1
- The spool valves 3/2 NC have threaded port connections • 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 ASCO 551 553 solenoid valves offer 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
- ASCO 551 553 solenoid valves satisfy all relevant EC Directives
Differential Pressure : 2 – 10.4 bar [1 bar = 100 kPa]
Flow (Qv at 6 bar): 1/4 = 860 l/min (ANR)
1/2 = 3800 l/min
| Fluids | Temperature Range (TS) | Valve Seal Materials |
| air, inert gas, filtered | -25°C to +60°C | NBR Nitrile + PUR Polyurethane |
ASCO 551-553 solenoid valves are available with NAMUR interface. NAMUR, translated from the German acronym to StandardiSation Association for Measurement and Control in Chemical Industries, is the specification for a standard interface between pneumatic actuators, solenoid valves and directional control valves.
ASCO 551 553 – valve FLUID CONTACT COMPATIBILITY
| ASCO 551 553 Solenoid Valve | |
| Body | Aluminium, black anodised |
| End cover (spring return) | Glass-filled PA |
| Spool valve internal parts | Zamak, stainless steel, POM, aluminium |
| Pilot end covers | Aluminium |
| Core and plugnut | Stainless steel |
| Seals | NBR |
| Shading coil | Copper |
ASCO 551 553 – valve ELECTRICAL CHARACTERISTICS
Valve Coil Insulation Class : F
Electrical Safety : IEC 335
Standard Valve Voltages : DC (=) 24V – 48V
AC (~) 24V – 48V – 115V – 230V(5)/50Hz; other voltages and 60Hz are available on request
ASCO 551 553 – VALVE SPECIFICATIONS
| Pipe size | Orifice size | Flow coefficient kV | Operating pressure differential (bar) | Power level ~/= | 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 551B405 |
| 1/4 | 6 | 0.75 | 12.5 | 0/2 | 10 | 10 | BP | ASCO 551H405 |
| 1/4 | 6 | 0.75 | 12.5 | 0/2 | 10 | 10 | LP | ASCO 551B305 |
| 1/4 | 6 | 0.75 | 12.5 | 0/2 | 10 | 10 | LP | ASCO 551H305 |
| 1/2 | 13 | 3.15 | 52.5 | 0/2 | 10 | 10 | BP | ASCO 553A405 |
| 1/2 | 13 | 3.15 | 52.5 | 0/2 | 10 | 10 | BP | ASCO 553G405 |
| 1/2 | 13 | 3.15 | 52.5 | 0/2 | 10 | 10 | LP | ASCO 553A305 |
| 1/2 | 13 | 3.15 | 52.5 | 0/2 | 10 | 10 | LP | ASCO 553G305 |
ASCO 551 553 – VALVE OPTIONS
- ASCO 551 553 solenoid 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 Solenoid Valves For Hazardous Area Oil, Gas & Petrochem Industries (ATEX & IECEx) – call T&D for sales, technical and specification support on all ASCO valves.
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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.
ASCO 551 553 Solenoid Valves (Spool) 3/2 NC, ¼”-3/8”-1/2” Aluminium (15-16 Pilots) – Hazardous Area Valve Ex d, Ex mb, Ex e mb, Ex ia, NEMA
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