The fluid filled with the pipe flows through the throttling device in the pipe, causing local contraction near the throttling part, increasing the flow rate, and producing a static pressure difference on the upper and downstream sides. Under the condition of known relevant parameters, according to the flow continuity principle and Bernoulli equation can be derived between the flow pressure and the flow of the flow throttling device, also known as the differential pressure flowmeter, is composed of a primary detection part (throttle part) and a secondary device (differential pressure transmitter and flow display instrument) is widely used in gas. Steam and liquid flow measurement. It has the characteristics of simple structure, easy maintenance, stable performance and reliable use. Orificule throttling device is a standard throttling part without calibration directly in accordance with national standards
1. National standard GB2624-81< Design, Installation and use of flow measurement throttling device >;
2. International standard ISO5167< Various throttling devices stipulated by the International Standards Organization >;
3. Ministry of Chemical Industry standard GJ516-87-HK06;