Bürkert Type 8681 process valve control head

Bürkert’s Type 8681 Control Head, integrating pneumatic actuation, feedback, diagnostics and fieldbus interface, has been engineered to assemble with all commercially available hygienic ball valves, butterfly valves, single-seat, double-seat and mix-proof valve configurations. It offers the same control features as the company’s Element angle-seat, globe and diaphragm valves.

Designed for use in hygienic processes in the dairy, food/beverage, biotechnology or pharmaceutical industries, the head has a smooth and chemically resistant IP65/67 enclosure that is easily cleaned and suited to use in washdown areas. The contactless internal positioning system negates internal wear and there are manual overrides on the pneumatic pilots. The product is designed for longevity and functionality within the sanitary process environment.

The product’s super-bright LED position indication is designed to be visible from across the plant floor. The green, amber and red LEDs indicate valve switching position, or maintenance/fault requirement, with status/colour settings customised via DIP switch. This feature is suitable in dairy and food/beverage plants, where process machinery commonly spans a wide distance or stretches high above walkways.

The control head controls strokes up to 85 mm with three positions, with 200 L/min pneumatic air for each pilot valve, and is certified for explosive environments, with ATEX Cat 3, Zone 2/22. Other features include: automatic configuration ‘teach-in’ software that autocommissions the control head; the ability to adjust chamber switching speed individually in both directions of movement; and a non-return valve to prevent faulty switching due to back-pressure.