The difference between throttling orifice plate and limiting orifice plate
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Release Time：2020-07-20
The measurement principle of the throttle orifice plate device is that when the fluid filling the pipe flows through the orifice plate, local contraction will occur, the flow beam will be concentrated, the flow rate will increase, and the static pressure will decrease. Therefore, there will be a static pressure difference before and after the orifice plate, which has a certain functional relationship with the flow rate. The greater the flow rate of the orifice, the greater the pressure difference. The differential pressure signal is transmitted to the differential pressure transmitter through the pressure conduit and converted to a standard signal of 4 to 20 mA. DC, and then display the instantaneous and cumulative flow in the pipeline through the flow indicator. There are three commonly used pressure taking methods for orifice plate throttling devices: angle pressure taking (ring chamber \drilling) and flange pressure taking. Throttle orifice plate
Throttle orifice plateThe device is the main device in the differential pressure flow measurement system.Throttle orifice plate, pressure taking device, front and rear straight pipe sections and connecting flanges, etc. It can be used with differential pressure transmitters to measure the single-phase and homogeneous flow of various liquids, gases and vapors in pipelines. Throttle orifice plate
The measurement principle of the restriction orifice plate is that it can be used as a flow measurement element to measure the flow, or as a throttling element to limit the flow and reduce the pressure. When there is a certain pressure difference before and after the orifice plate, the fluid flows through the orifice plate. For a certain hole diameter, the flow through the orifice plate increases with the increase of the pressure difference. Jiangsu Zhongneng Instrument Technology Co., Ltd. However, when the pressure difference exceeds a certain value (called the critical pressure difference), the speed of the fluid passing through the orifice plate and the orifice reaches the speed of sound. At this time, no matter how the pressure difference increases, as long as the pressure upstream of the orifice plate remains unchanged, the flow through the orifice plate will remain at a certain value and will not increase. The restriction orifice plate is based on this principle to limit the flow rate of the fluid and reduce the pressure.Throttle orifice plate
A restriction orifice plate is provided in the conduit to restrict the flow of the fluid or reduce the pressure of the fluid. The flow limiting orifice plate is suitable for the following aspects: process materials need to be depressurized, and the accuracy is not high; where the fluid needs small flow and continuous circulation, such as the flushing pipeline of the pump, the bypass pipeline of the hot standby pump (low flow protection pipeline), and analysis Sampling pipes, etc.; when there is a large pressure drop upstream/downstream of the valve in the pipeline, in order to reduce the erosion of the fluid on the valve, when the orifice, the orifice plate may be connected in series upstream of the valve.
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