ATEX Solenoid Valves – ASCO Valves for International Hazardous Area Installations

Published 22 Sep 2016

Hazardous Area Valves

Hazardous Area Valves With ATEX Certification


  • By Chris Dodds : estimated reading time 3 minutes

ATEX Solenoid Valves For Hazardous Areas ASCO  

T&D are an ASCO Numatics Authorised Distribution Channel and suppliers of ASCO Solenoid Valves to the oil, gas, chemical and process industries – this includes the most extensive range of hazardous area solenoid valves for all Zone, Class & Division with ATEX and IECEx certifications

T&D are pleased to present the new ASCO Hazardous Area Location Solutions Catalogue : the publication assists, informs and supports the specification and selection of the correct solenoid valve with ATEX certification for hazardous area locations and process industry applications, including Ex d flameproof valves and explosion proof solenoid operators. 

What is ATEX?

“ATEX” is an acronym for “ATmosphere EXplosive” i.e. explosive atmosphere. An explosive atmosphere is a mixture of flammable gases, vapours, mists or dusts with air, under specific atmospheric conditions in which, after ignition has occured, combustion propagates to the flammable mixture.

In order for a potentially explosive atmosphere to form, the flammable substances must be present in a certain concentration. If the concentration is too low (lean mixture) or too high (rich mixture), no explosion occurs: instead there is just a slow combustion reaction or no reaction at all.

To summarise, the explosion can occur only in the presence of an ignition source and when the concentration is within the explosive range of substances i.e. between the lower explosive limit (LEL) and upper explosive limit (UEL). The explosive limits depend on the ambient pressure and the percentage of oxygen in the air.

ATEX Directives

The European Union has implemented two harmonized hazardous area directives, known as ATEX 94/9/EC (also ATEX 100a, which, as of April 2016, will be replaced by the new directive 2014/34/UE and ATEX 99/92/EC (also ATEX 137).

For further information about ATEX click here.


ASCO manufacture globally approved three-way and four-way solenoid valves for a wide variety of process applications in hazardous areas or potentially explosive environments. The majority of the valves included in the catalogue are part of the ASCO Express Shipping Program and can be shipped by T&D within five days or less.


ASCO – don’t delay, call T&D today. 2000+ ASCO products ready for immediate shipment.






Here is a Slideshare of the Hazardous Area Valve Guide – a download version is at the bottom of this page.


Hazardous area solenoid valves from ASCO include : EX Proof, Intrinsically Safe, Non-Incendive Field Wiring and Harsh Environment valves with UL, CSA, FM, ATEX, IECEx, NEPSI and TR CU approvals.

ASCO Valves

T&D – The Specialist Supplier of ASCO ATEX Solenoid Valves

ASCO Valves for Hazardous Areas

ASCO Valves - Stainless steel spool valves

ASCO Valves – Stainless steel spool valves for hazardous area oil and gas projects

Fluid automation equipment must operate flawlessly in hazardous areas and explosive environments. Solenoid-operated valves from ASCO are essential flow control components in these challenging applications. Solenoid valves must comply with the strictest safety regulations while staying up and running, cycle after cycle, year after year.

ASCO offers the world’s most comprehensive family of ATEX solenoid valves that hold approval from the leading global hazardous area certification agencies – UL, CSA, FM, ATEX, and IECEx.

In addition, ASCO valves are inspected and certified to ATEX in Europe, NEPSI in China, INMETRO in Brazil, and TR CU in Russia.

ASCO users can specify highly reliable ASCO valves in their designs and be assured they are approved for use in dangerous conditions — anywhere in the world.

ATEX Solenoid Valves

ASCO Hazardous Area Solenoid Valves – ATEX • CSA • FM • UL • IECEx • INMETRO • TR CU

Valves - NEPSI Hazardous Area Solenoid Valves

Valves - IECEx Hazardous Area Solenoid Valves


Valves - TR CU

Valves - INMETRO Hazardous Area Solenoid Valves

Solenoid Valves : International Hazardous Area Classifications

ATEX – Definition of a Location Where A Potentially Explosive Atmosphere May Occur

ATEX Hazardous Areas

ATEX Certified Valves

The hazardous area classification of an installation into distinct zones has two objectives (according to ATEX 1999/92/EC) : –

  1. To define the categories of equipment, including solenoid valves, used in the zones indicated, provided they are suitable for gases, vapours or mists and/or dusts.
  2. To classify hazardous places into zones to prevent ignition sources and be able to select the correct electrical and non-electrical equipment accordingly. The zones are defined on the basis of the occurrence of explosive gaseous or dusty atmospheres.

Consult T&D Technical Sales Engineers for specification support in determining the correct ATEX solenoid valves.

Hazardous Area Valves - Zone 1 Zone 2 ATEX Solenoid Valves

For expert technical support in Hazardous Area Valve selection, just call T&D.

ASCO Valves – History & Future Innovation

Age builds trust.

ASCO, in 1888 started out manufacturing elevator, compressor and generator controls.

In 1910 ASCO became the first company to develop and manufacture a new electrically operated control device known as the solenoid valve.

Since then, ASCO have pioneered and patented many designs of ATEX solenoid valves for flow control in hazardous areas – a track record that extends back decades but continues to innovate in the field of flow control today.

ASCO offers hundreds of solenoid valve constructions, many with ATEX certification and various global approvals that can be exported worldwide.

ASCO solenoid valves are famous for their robust operator heads and extended service lives – the valves are ideal for the mission-critical demands of power generation, chemical processing, oil, gas, and refining applications, plus general machinery, wellhead control, mining equipment and measuring and controlling devices.

Solenoid Valves

Hazardous Area ATEX Solenoid Valves

ASCO 551 

ASCO 551 solenoid valves are primarily used for valve piloting applications. 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.

Hazardous Area Classification – Useful Links

Hazardous Area Certification

more asco reading

 ➡ ASCO Valves – Selecting & Ordering The Correct Valve    


Hazardous Area Knowledge & Experience

All T&D Sales Engineers hold CompEx Certificates (Hazardous Awareness Course EX F) and undertake advanced and ongoing technical training with suppliers – we can be safely trusted to specify and supply Electrical, Mechanical, Process & Instrumentation Equipment for use in hazardous areas and explosive atmospheres.

The CompEx Scheme is now the global solution for validating core competency of employees and contract staff of major users in the gas, oil & chemical sectors, both with offshore and onshore activities – designed and developed by industry for industry.

Hazardous Area Explosion Protection Equipment

T&D UK & International: Project Suppliers To The Onshore & Offshore Oil, Gas, Petrochem & Hazardous Area Industries.

Invitation – network, engage, promote

Thorne & Derrick are inviting you to join LinkedIn’s fastest growing Discussion Group – Process & Hazardous Area Industries : Heat Tracing, Gas Detection, Fluid Control & Flow Measurement. News, projects, videos, promotions, whitepapers, jobs, webinars, press plus much more. Instrumentation, Mechanical, Heating, Metering, Process, Flow Control - Hazardous Areas

Thorne & Derrick


Thorne & Derrick International are your single-source supplier of Electrical, Mechanical, Process & Instrumentation Equipment. T&D provide an outstanding service to UK and international customers – we are highly customer responsive and absolutely committed to providing a world-class service.

T&D supply utilities, power, renewable energy, construction, rail, manufacturing, food/beverage, mining, oil, gas and petrochemical industries – distributing 100,000+ products from 100+ manufacturers from multi-million pound stocks. Since 1985 we have established a solid reputation based on service, integrity and trust.

Further Reading