ASCO 551-553 Series | Ex ia Intrinsically Safe ATEX IECEx Aluminium Solenoid Valves NAMUR 3/2 NC 5/2 5/3

asco eX ia solenoid valves

intrinsically safe

551-553 3/2 Nc 5/2 5/3

ASCO 551-553 explosion proof solenoid valves are single/dual solenoid valves, which are pilot operated, have an aluminium body and are 1/4 and 1/2 tapped.

The monostable spool valves are manufactured and certified as Intrinsically Safe for hazardous area use according to IEC explosion protection techniques; IEC61508 Standard (2010 route 2H version) when used with ASCO LI or WSLI operators and are TÜV (551 series) and EXIDA (551-553 series) certified with integrity levels: SIL 2 for HFT = 0 / SIL 3 for HFT = 1.

eX ia INtrinsically safe solenoid Valves

features

The 3/2 NC spool solenoid valves have threaded port connections
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 ia 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

ASCO Solenoid Valves & Valve Operators are ATEX & IECEx certified for Class I, Division 2 and Zone 1 & Zone 2 hazardous areas.

asco 551-553 EX ia solenoid valves

specification

Differential Pressure: 2 – 10,4 bar [1 bar =100 kPa]
Flow (Qv at 6 bar): 1/4 = 700 l/min (ANR) | 1/2 = 3000 l/min
Fluids: air, inert gas, filtered
Temperature Range: -25°C to +60°C
Seal Materials: NBR (nitrile) + PUR (polyurethane)

asco ex ia solenoid valves – ordering information

Pipe Size	Orifice Size	Flow Coefficient Kv		Operating Pressure Differential (bar)			Power Level	Ex ia Prefix (Operator)	Thread Type	ASCO Order Code
				Minimum*	Maximum (PS)
					Air
		(m³/h)	(l/min)		∼	=	∼/=
3/2 NC – 5/2 – Solenoid air pilot operated – spring return (monostable)
1/4	6	0.6	10	0 / 2	10	10	Low Power 0.5W – 2W	LI WSLI	NPT ANSI 1.20.3	8551B301
									ISO G (228/1)	G551B301
1/2	13	2.49	41.5						NPT ANSI 1.20.3	8553A301
									ISO G (228/1)	G553A301
3/2 NC – 5/2 – Solenoid air pilot operated and return (bistable)
1/4	6	0.6	10	0 / 2	10	10	Low Power 0.5W – 2W	LI WSLI	NPT ANSI 1.20.3	8551B302
									ISO G (228/1)	G551B302
1/2	13	2.49	41.5						NPT ANSI 1.20.3	8553A302
									ISO G (228/1)	G553A302
5/3 – W1 – pressure held, solenoid air pilot operated and return
1/4	6	0.6	10	0 / 2	10	10	Low Power 0.5W – 2W	LI WSLI	NPT ANSI 1.20.3	8551B365
									ISO G (228/1)	G551B365
1/2	13	2.49	41.5						NPT ANSI 1.20.3	8553A365
									ISO G (228/1)	G553A365
5/3 – W3 – pressure release, solenoid air pilot operated and return
1/4	6	0.6	10	0 / 2	10	10	Low Power 0.5W – 2W	LI WSLI	NPT ANSI 1.20.3	8551B366
									ISO G (228/1)	G551B366
1/2	13	2.49	41.5						NPT ANSI 1.20.3	8553A366
									ISO G (228/1)	G553A366

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

asco 551-553 series

SOLENOID VALVES 3/2 nc 5/2 5/3 – dimensions

ASCO 551 – 553 NAMUR Solenoid Valves | Dimensions (mm)

Intrinsically Safe

Type 14 – LI/WSLI

Aluminium, cataphorese black painting / AISI 316L Stainless Steel
LI / WSLI: EN/IEC 60079-11, 60079-31

ASCO Solenoid Valves | Type 14 Dimensions (mm)

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Cable gland for unarmoured cable with 7 to 12 mm dia. sheath
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Manual operator location, suffix MO
External pilot air supply, 1/8 pipe size

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)

Low Power – Type 14
Power Ratings – Hot/Cold (W): 0.5/0.5
Operator Ambient Temperature Range (TS) : -40°C to +60°C
Hazardous Area Safety Code: II1G Ex ia IIC T6 Ga, II2D Ex tb IIIC Db
Electrical Enclosure Protection (EN 60529): IP66/67, Aluminium (LI) Stainless Steel (WSLI)
Electrical Connections: 1/2″ NPT threaded cable entry. Enclosures are supplied without cable gland

Safety Parameters