ASCO 551 553 Valves | Exd Flameproof ATEX IECEx Solenoid Valves NAMUR (Aluminium)

ASCO 551-553 NAMUR Ex d Flamproof Solenoid Valve – Pilot Operated

eX D Flameproof

ASCO 551-553 NAMUR solenoid Valves

ASCO 551-553 Exd Flameproof Valves are NAMUR style 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 for hazardous area use according to IEC 61508 Standard (2010 route 2H version) 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 D Flameproof solenoid Valves

features

ASCO flameproof aluminium 551 & 553 NAMUR solenoid valves can be adapted for 3/2 NC or 5/2 functions to control both double and single-acting actuators
The solenoid operated spool valves have threaded port connections and a ‘NAMUR’ interface
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 d flameproof 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 can be mounted in any position without affecting operation
Ex mb/mD (prefix “PV”) solenoid can be supplied with various lengths of cable
Other pipe threads are available on request

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

asco 551-553 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)

Materials In Contact With Fluid

Body, end cover	Aluminium, black anodised
End cover (spring return)	Glass fibre filled PA
Spool valve internal parts	Zamak, stainless steel, POM, aluminium
Interface plates	Glass fibre filled PA
Pilot end covers	Aluminium
Core tube	Stainless steel
Core and plugnut	Stainless steel
Core spring	Stainless steel
Seals	NBR (Nitrile Butadiene Rubber)
Top disc	PA (Polyamide Nylon)
Disc holder	CA (Cellulose Acetate)
Cartridge (low power)	Welded, stainless steel or aluminium
Seat	Brass
Seat insert	POM
Shading coil	Copper
Rider rings (low power)	PTFE (NF/WSNF solenoids only)