ATEX should not limit your choice of process control equipment

Applications involving potentially explosive environments can sometimes appear restrictive when selecting process control valves that adhere to ATEX standards. However, with more than 25 years’ experience in delivering solutions for hazardous areas, Bürkert has a solution to meet your needs.

As one of the leading manufacturers of control and measuring systems for fluids and gases, Bürkert has been delivering solutions for hazardous areas for the last quarter of a century. The development of ATEX and IECEx certified versions of its industry leading components, as well as complete control systems, has been supported by the establishment of a centre of competence in Menden, Germany.

Types of ATEX rated control valves

At the operational end, the ELEMENT valve controllers were initially designed to operate Bürkert’s CLASSIC range of process valves and they are now rapidly becoming the global standard for process control, setting the benchmark for the major manufacturers. Having already been developed to control third party process valves, the latest improvements include ATEX and IECEx approvals for operation in Zones 2/22 and 1/21 where potentially explosive atmospheres may exist.

Similarly, with such a wide variety of applications, the use of quarter turn valves has become widespread. But it is very important to ensure that the selection process is carried out carefully, so as to avoid poor performance or incompatible equipment. Development of this commonly used valve actuator includes the Type 3004 actuator, which is classified as ATEX II 2 GD Ex d II B T6 and rated to IP67 and therefore suitable for installation in areas classified as Zone 1.

Further enhancements can be made using servo-assisted pneumatic valves, such as the Type 6519, which can be installed individually or in manifolds and can be used to control double or single acting actuators. Available in EEx m and EEx i versions, they provide a high flow rate capacity and reduced power consumption, which is often an important factor, especially in larger installations, where the cumulative power consumption of a process control system can be significant.

AirLINE Ex 8650 electro-pneumatic automation system

However, the benefits of these individual components can only be properly appreciated when they are brought together within a comprehensive design structure that maximises their benefits. This can be accomplished with the AirLINE Ex 8650, which is one of the only electro-pneumatic automation systems designed for installation in Zone 1.

This system is particularly suited to decentralised process control tasks concerning fine chemicals, pharmaceuticals, cosmetics and oil & gas. It can be used, for example, to automate the filling of potentially volatile solvents, alcohol or lacquers. In these application areas, the system is unique, as it is the only compact electro-pneumatic automation solution allowing integration of EEx ia rated pneumatic valves without additional wiring.

Systems such as this can only really deliver the expectations of the client if they are conceived, designed and manufactured by a single, dedicated team with the experience to appreciate the fine detail involved.

Innovative process control solutions

When there is a requirement, but not a product or solution to fit it yet, then custom built is still a viable route. By creating the Systemhaus concept, Bürkert provides experienced teams of designers, project managers and engineers who work together to produce innovative solutions. The Dortmund Systemhaus, for example, maintains a very high level of expertise specific to delivering control cabinets for installations for potentially explosive atmospheres.

From initial concept, to on-site commissioning, a dedicated team is assigned to each project to ensure both continuity and understanding of project requirements are maintained. Due to the multiple competencies within each team, it is possible to design compact, integrated solutions that often contain both electrical and pneumatic circuits and even fluidic connections as well. In this way it is possible to deliver a single control cabinet, minimising space requirements as well as all the equipment that will deliver the process control itself, which reduces commissioning time and improves final delivery.

For more information about Bürkert’s complete range of ATEX rated products, please visit www.burkert.co.uk or phone +44 (0) 1285 648720.