Since 1879
Rieger Ventilprogramm

FAQ automation technology

What is NO or NC?

NO means Normally Open
NC means Normally Closed

These figures relate to the situation when the power supply to the actuator fails (= normal position). Then, the spring inside the actuator moves the valve into the rest position.

What differentiates a control top of a positioner ?

  • Control tops always indicate only a 0 or 1 signal, ie. the end position.
  • Positioners indicate the position from 0-100 %, with intermediate positions.

Note: This section will be updated regularly.

If your question was not answered on these pages, please send us an email or call us at +49 7361 5702 0.


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Gebr. Rieger GmbH & Co. KG
Kochertalstraße 32
73431 Aalen - Germany

Tel.: +49 (0) 7361 - 5702-0
Fax: +49 (0) 7361 - 5702-51

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