# Self-Acting Pressure Sustainer/Reducer

Self acting pressure sustainers and reducers control the pressure at any point in a flow system. The measurement and control mechanisms are encapsulated within a single device. For these types of pressure regulators the static pressure is measured and controlled. If you need to control stagnation pressure or are using say a pitot tube to measure pressure remotely then you should use a pressure control valve instead of the self regulating type.