Bürkert Type 8681 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. The Type 8681 offers the same control features as Bürkert’s Element angle-seat, globe and diaphragm valves.

Designed for use in hygienic processes in the dairy, food/beverage, biotechnology or pharmaceutical industries, the 8681 head has a smooth and chemically resistant IP65/67 enclosure that is easily cleaned and suited to use in washdown areas, Bürkert claims. Internally, the contactless internal positioning system reduces internal wear and the pneumatic pilots have manual overrides.

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 is suitable for use in dairy and food/beverage plants, where process machinery often spans a wide distance or stretches above walkways.

The 8681 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 inclusions are: automatic configuration ‘teach-in’ software, which 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.