Many control tasks involve simple control loops with predictable operating patterns. The reference variable remains constant over long periods of time, often during the entire service life. Furthermore, deviations in the controlled variable are acceptable.
The use of self-operated regulators can help to drastically reduce costs spent on control equipment intended for such control tasks. These regulators draw their energy from the process medium itself and use it in measuring and positioning the valve.
There is no need to invest in equipment such as transmitters and control units together with their wiring and maintenance. What's more, no auxiliary power supply is required - a cost-cutting factor especially where extensive gas, water or heat supply networks are concerned.
