ASCO 551 552 553 - Solenoid Valves Spool Type

ASCO Solenoid Valves - 551 Series, 552 Series & 553 Series

ASCO Spool Type Solenoid Valves

551, 552 & 553 ASCO solenoid valves are primarily used for valve piloting applications.

ASCO are a world leader in the manufacture of solenoid valves and pressure operated valves providing solutions to meet almost all client requirements - ATEX certified hazardous area solenoid valves are available for hazardous area Zone 1 and Zone 2. 

ASCO 551, 552 & 553 Solenoid Valves -  ApplicationsASCO-551-Solenoid-Valves

  • Sterilisation & Pasteurisation in the Food Industry
  • Valve Piloting for Offshore Applications
  • Cylinder Piloting (Hoppers)
  • Valve Piloting in Pulp & Paper Industry
  • Control of Air Tightness

ASCO 551 Valves

Solenoid valves are of non breathing construction - the pilot exhaust is collected in the main valve exhaust for dust and water protection. Valve actuator and pilot valve are isolated from the main environment.

ATEX Hazardous Area Solenoid Valves

Low Power Pilot Ex d

Low power 0.5W solenoid available in aluminium and 316 Stainless Steel. Ideal for harsh industrial environments and offers low energy solution for actuator piloting.

Intrinsically Safe Pilot – Ex ia  

Low power 0.5W solenoid available in aluminium and 316 Stainless Steel. Available in 24V, -40-60C and IP 67. Also available with flameproof enclosure.

This protection method is suitable for all process industries, Zone 0-21. IECEx approved, IEC61508 functional safety SIL 3.  ASCO 551, 552 & 553 valves with Ex-is solenoids provide and ideal solution for Oil & Gas industry applications.

Ultra Low Power Pilot for 551 Series

ASCO have developed an ultra low power pilot which is compatible with intrinsically safe barriers mounted in zone and controlled by fieldbus. The ultra low power pilot provides an ideal solution for chemical, Oil and pharmaceutical applications.

ATEX & IECEx Hazardous Area DefinitionsATEX Hazardous Area - Solenoid Valves ASCO

Ex i Intrinsic Safety

A protection concept in which the electrical energy within the equipment is restricted to a level which is below that what may cause an ignition or to limit the heating of the surface of the equipment.

There are two main sub types to Ex i protection, these being “ia” and “ib”. Type “ia” protection allows for the occurrence of two faults during operation Type “ib” protection allows for the occurrence of one fault during operation.

Ex d Flameproof

The equipment that may cause an explosion is contained within an enclosure which can withstand the force of an explosion and prevent transmission to the outside hazardous atmosphere.

This method of protection also prevents the hazardous atmosphere from entering the enclosure and coming into contact with equipment.

Ex m Encapsulation

A protection concept where by equipment that could potentially cause an ignition is encapsulated within a compound or resin so as to prevent contact with the explosive atmosphere.

The concept also limits the surface temperature of the equipment under normal operating conditions.

Ex e Increased Safety

Precautions are applied to the installation to ensure increased security against the possibility of excessive temperatures and sparks from electrical equipment.

Equipment that normally causes sparks is excluded from use within this method of protection.

NEMA 7 Enclosures are for indoor use in locations classified as Class I, Groups A, B, C, or D and shall be capable of withstanding the pressures resulting from an internal explosion of specified gases, and contain such an explosion sufficiently that an explosive gas-air mixture existing in the atmosphere surrounding the enclosure will not be ignited.

Enclosed heat generating devices shall not cause external surfaces to reach temperatures capable of igniting explosive gas-air mixtures in the surrounding atmosphere. Enclosures shall meet explosion, hydro-static, and temperature design tests.

NEMA 9 Enclosures are intended for indoor use in locations classified as Class II, Groups E, F, or G, and shall be capable of preventing the entrance of dust.

Enclosed heat generating devices shall not cause external surfaces to reach temperatures capable of igniting or discolouring dust on the enclosure or igniting dust-air mixtures in the surrounding atmosphere.

Enclosures shall meet dust penetration and temperature design tests and aging of gaskets (if used).

Contact T&D for competitive prices and fast delivery for ASCO valves. 

ASCO Solenoid Valves

ASCO 551 552 553 - Solenoid Valves Spool Type

Heat Tracing - Thorne & Derrick