The flow restrictor is a safety protection valve used for non-corrosive media such as oil. When the flow rate of the medium in the pipeline exceeds the set value, it is immediately closed. When the pipeline or accessories are damaged and the flow rate is too high, it is automatically closed to prevent the occurrence or expansion of accidents. It is generally installed at the inlet and outlet of the storage tank or the outlet of the pipeline to protect the safety and safety of downstream equipment. reliability.