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8691 On/Off Control Head


Control head for decentralized automation of ELEMENT process valves

Harco offers the Bürkert Type 8691 On/Off Control Head, designed for decentralized automation of ELEMENT Type 21xx pneumatic process valves. Registration of the valve position is done through a contact-free analogue sensor element, automatically recognizing and saving the valve end position through the Teach function during start-up. The integrated pilot valve controls single or double- acting actuators. As an option a communication interface, AS-Interface, IO-Link or büS (based on CANopen) can be chosen.

The design of Bürkert’s Type 8691 On/Off control head and the actuator enables an internal control air routing without external tubing. Besides the electrical position feedback, the status of the device is shown directly on the control head itself through colored powerful LEDs, even in difficult ambient conditions.

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.

Choose Harco and the Bürkert Type 8691 On/Off Control Head for reliable, efficient, and hygienic automation solutions in your processing applications.


  • Contact-free inductive valve position registration (Teach-In function)
  • Colored illuminated status display
  • Integrated control air routing in the actuator
  • Fieldbus interface AS interface, IO-Link or Bürkert system bus (büS)
  • With ATEX II cat. 3G/D / IECEx approval

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