Hazardous Area & Process Heating · ASCO Solenoid Valves (SIL3 NACE ATEX NAMUR Valves)

ASCO 551-553 Valves | Ex e mb Increased Safety Encapsulated Stainless Steel Solenoid Valves 5/2 5/3

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

CategoryProcess Instrumentation

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Product Overview

551-553 5/2 5/3

ASCO 551-553 Series explosion proof solenoid valves are 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 = 860 l/min (5/2) ; 760 l/min (5/3) (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: 551A421 / 551A422 / 551A438 / 551A439 / 553A421 / 553A422

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: 551A321 / 551A322 / 551A338 / 551A339 / 553A321 / 553A322

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 5/2 5/3

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

Technical Specifications

Category	Process Instrumentation

Valve Operator Type	Valve Operator Prefix	Power Level	Series	A	B	C	Weight (including coils & connectors)
							Monostable	Bistable
04	EM/WSEM	Basic Power	551	160 mm	216 mm	103 mm	1.70 kg	3.49 kg
			553	198 mm	261 mm	109 mm	2.69 kg	5.04 kg

Valve Operator Type	Valve Operator Prefix	Power Level	Series	A	B	C	Weight (including coils & connectors)
							Monostable	Bistable
09	EM/WSEM	Low Power	551	160 mm	216 mm	102 mm	1.70 kg	3.49 kg
			553	198 mm	261 mm	108 mm	2.69 kg	5.04 kg

Pipe Size	Orifice Size	Flow Coefficient Kv		Operating Pressure Differential (bar)			Power Level	Ex e mb Prefix	Thread Type	ASCO Order Code
				Minimum*	Maximum (PS)
					Air
		(m³/h)	(l/min)		∼	=	∼/=
5/2 Solenoid air pilot operated – spring return (monostable)
1/4	6	0.75	12.5	0 / 2	10	10	Basic Power	EM	NPT ANSI 1.20.3	8551A421**
									ISO G (228/1)	G551A421**
							Low Power		NPT ANSI 1.20.3	8551A321**
									ISO G (228/1)	G551A321**
1/2	13	2.49	41.5				Basic Power		NPT ANSI 1.20.3	8553A421**
									ISO G (228/1)	G553A421**
							Low Power		NPT ANSI 1.20.3	8553A321**
									ISO G (228/1)	G553A321**
5/2 Solenoid air pilot operated and return (bistable)
1/4	6	0.75	12.5	0 / 2	10	10	Basic Power	EM	NPT ANSI 1.20.3	8551A422
									ISO G (228/1)	G551A422
							Low Power		NPT ANSI 1.20.3	8551A322
									ISO G (228/1)	G551A322
1/2	13	2.49	41.5				Basic Power		NPT ANSI 1.20.3	8553A422
									ISO G (228/1)	G553A422
							Low Power		NPT ANSI 1.20.3	8553A322
									ISO G (228/1)	G553A322
5/3 – W1 – pressure held, solenoid air pilot operated and return
1/4	6	0.66	11	0 / 2	10	10	Basic Power	EM	NPT ANSI 1.20.3	8551A438
									ISO G (228/1)	G551A438
							Low Power		NPT ANSI 1.20.3	8551A338
									ISO G (228/1)	G551A338
5/3 – W3 – pressure release, solenoid air pilot operated and return
1/4	6	0.66	11	0 / 2	10	10	Basic Power	EM	NPT ANSI 1.20.3	8551A439
									ISO G (228/1)	G551A439
							Low Power		NPT ANSI 1.20.3	8551A339
									ISO G (228/1)	G551A339

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