The pneumatic control unit Type 8690 is designed for decentralised automation of
ELEMENT Type 21xx pneumatic process valves. Mechanical or inductive limit
switches register the valve position. The integrated pilot valve controls single or
double-acting actuators. The design of the control unit and the actuator enables an
internal control air routing without external tubings. Besides the electrical position
feedback, the status of the device is shown directly on the pneumatic control
unit itself. The housing is easy to clean and features proven IP protection and
chemically resistant materials for use in hygienic processing, in food, beverage and
pharmaceutical industries. Focused on wash down applications, the IP protection
of the housing is supported by a positive pressure inside the control head.
Combined with Bürkert ELEMENT actuators, the pneumatic actuating system
enables spring chamber aeration that avoids actuator chamber contamination from
the environment.
Type description