ASCO 551-553 Valves | Ex e mb Increased Safety Encapsulated Stainless Steel Solenoid Valves NAMUR

Product Overview

551-553 namur 3/2 nc & 5/2

ASCO 551-553 Series explosion proof solenoid valves are NAMUR Style 1/4 and 1/2 tapped, stainless steel bodied, pilot operated, spool type, single/dual solenoid valves.

The Ex e mb spool valves are manufactured and certified for hazardous area use according to IEC 61508 Standard (2010 route 2H version) and are TÜV and EXIDA certified with integrity levels: SIL 2 for HFT = 0 / SIL 3 for HFT = 1.

These solenoid valves are supplied with ASCO EM or WSEM Increased Safety & Encapsulated valve operators.

features

• In order to provide better environmental protection against the ingress of liquids, dusts and other foreign matter, all of the exhaust ports are connectable. This is particularly recommended for sensitive areas, such as clean rooms, and applications within the pharmaceutical and food processing sectors
• The Ex e mb solenoid valves can be externally piloted via an external air pilot supply, in order to convert the valve to zero minimum operation by flipping a gasket
• The solenoid valves satisfy all relevant EU directives

specification

Differential Pressure: 2 – 10,4 bar [1 bar =100 kPa]
Flow (Qv at 6 bar): 1/4 tapped – 700 l/min (ANR) | 1/2 tapped – 3000 l/min
Fluids: air, inert gas, filtered
Temperature Range: 553: -40°C to +60°C | 551: -40°C to +80°C
Seal Materials: VMQ (silicone) + PUR (polyurethane)

Type EM:

• Waterproof IP66/67 – Metal enclosure (EN/IEC 60079-7,-18 and -31)
• ATEX/IECEx valves using these solenoids are approved according to EN ISO 80079-36 (2016) and EN ISO 80079-37 (2016) [non electrical]

TYPE 04: Metal, epoxy coated / AISI 316L SS | EM / WSEM: EN/IEC 60079-7+18+31

Order Codes: 551A409 / 551A410 / 553A409 / 553A410

Type WSEM:

• Waterproof IP66/67 – 316 SS enclosure (EN/IEC 60079-0+7+18+31)
• ATEX/IECEx valves using these solenoids are approved according to EN ISO 80079-36 (2016) and EN ISO 80079-37 (2016) [non electrical]

TYPE 09: Metal, epoxy coated / AISI 316L SS | EM / WSEM: EN/IEC 60079-7+18+31

Order Codes: 551A309 / 551A310 / 553A309 / 553A310

asco ex e mb valves – ordering information

* Zero minimum is only achieved if external pressure is applied.

**Use suffix “SL” where IEC 61508 Functional Safety data certification is required.

asco 551-553 valves – dimensions

Type ASCO 551-553 3/2 NC & 5/2

1. Interface plate
2. 2 mounting holes: 5,3 mm dia. (Spotfacing: 9 mm dia., depth 5 mm); 2 screws (CHc M5 x 35), engaged length: 7 mm
3. One 5 mm dia. hole for dowel pin:
   – in position C1: 3/2 NC function plate
   – in position C2: 5/2 function plate
4. 2 O-ring seals (supplied)
5. 2 mounting holes: 6,5 mm dia. (Spotfacing: 11 mm dia., depth 6 mm); 2 screws (CHc M6 x 50), engaged length: 7 mm

electrical characteristics & connections

Coil insulation class: F
Electrical safety: IEC 335
Standard voltages: DC (=) 24V – 48V | AC (~) 24V – 48V – 115V – 230V/50Hz; (other voltages and 60Hz are available on request)

Basic Power – Type 04

• Power Ratings – Inrush (VA): 55, Holding (VA): 23, Holding (W): 10.5, Hot/Cold (W): 9/11,2
• Operator Ambient Temperature Range (TS) : -40°C to +40°C
• Hazardous Area Safety Code: II2G Ex eb mb IIC Gb T3, II2D Ex tb IIIC Db
• Electrical Enclosure Protection (EN 60529): IP66/67, steel /SS
• Electrical Connections: M20 plastic cable gland for cables with an outer diameter from 7 to 12 mm

Low Power – Type 09

• Power Ratings – Inrush (VA): 1.5, Holding (VA): 1.5, Holding (W): 1.5, Hot/Cold (W): 1,7/1,7
• Operator Ambient Temperature Range (TS) : -40°C to +40/55°C
• Hazardous Area Safety Code: II2G Ex eb mb IIC Gb T6/T5, II2D Ex tb IIIC Db
• Electrical Enclosure Protection (EN 60529): IP66/67, steel /SS
• Electrical Connections: M20 plastic cable gland for cables with an outer diameter from 7 to 12 mm