What is a throttling orifice? What is the difference with a throttling orifice?
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Release Time：2022-07-20
When the pressure difference between the front and back of the pipeline is large, the orifice plate is often used. The principle is: when the fluid flows in the pipeline, the local resistance of the orifice plate will cause energy loss, because the pressure of the fluid is reduced. This phenomenon is thermodynamically known as throttling. This method is simpler than using a regulating valve, but it must be properly selected, otherwise the liquid is prone to cavitation and affects the safe operation of the pipeline.
When the pressure difference between the front and back of the pipeline is large, the orifice plate is often used. The principle is: when the fluid flows in the pipeline, the local resistance of the orifice plate will cause energy loss, because the pressure of the fluid is reduced. This phenomenon is thermodynamically known as throttling. This method is simpler than using a regulating valve, but it must be properly selected, otherwise the liquid is prone to cavitation and affects the safe operation of the pipeline.
The orifice throttling device is the main device in the differential pressure flow measurement system, which consists of a pressure device, a throttling orifice, front and rear straight pipe sections and a connecting flange. Used in conjunction with a differential pressure transmitter, it can measure the single-phase uniform flow of various liquids, gases and vapors filling the pipeline.
structure of throttle orifice plate:1Throttling components: standard nozzle, standard orifice plate, large diameter nozzle, circular orifice plate, double orifice plate,1/4Circular orifice plate, eccentric orifice plate, conical inlet orifice plate, etc.2Pressure taking device: pressure taking flange, annular chamber, snap ring, pressure pipe, etc.3Connecting flange(Flanges for national standards, various standards and other design departments)and fasteners.
The working principle of the orifice plate: the fluid filled in the pipeline flows through the throttling device in the pipeline, causing local contraction near the throttling element, increasing the flow rate, and generating a static pressure difference between the upstream and downstream sides. When the relevant parameters are known, the relationship between the pressure difference and the flow rate can be derived, and the flow rate can be obtained according to the principle of flow continuity and the Bernoulli equation.
Throttle orifice plate measurement principle: when the fluid filled with the pipe flows through the orifice plate, it will produce concentrated flow, increased flow, local contraction and reduced static pressure, so the static pressure difference will be generated before and after the orifice plate. The greater the flow rate, the greater the pressure difference, and the static pressure difference has a certain function relationship with the flow rate. The instantaneous and cumulative flow in the pipeline can be displayed by the flow indicator, and the differential pressure signal is transmitted to the differential pressure transmitter through the pressure conduit and converted4 ~ 20 mA DCstandard signal. There are three commonly used pressure taking methods for orifice plate throttling devices: angle pressure taking(Ring chamber, drilling)And flange pressure.
Orifice orifice measurement standard: Flow measurement throttling device uses orifice plate, nozzle and venturi tube to measure the flow of fluid filled with circular tube. The flow measurement of the main pipeline of urban artificial gas adopts the method of standard orifice plate throttling device, and the standard orifice plate flowmeter is used to measure the flow of natural gas.
A restriction orifice plate is provided in the pipe to restrict the flow of the fluid or reduce the pressure of the fluid. The flow limiting orifice plate is used in the following aspects: the accuracy requirement is not high, and the process material needs to be depressurized. In order to reduce the erosion of the fluid on the valve, when the upstream and downstream pressure drop of the valve in the pipeline is large and the gas phase is not generated by the orifice plate throttling, the orifice plate can be connected in series upstream of the valve. Where the fluid needs a small flow of continuous circulation, such as the bypass pipe of the hot standby pump(Low flow protection pipeline)1. Analysis of sampling pipes, flushing pipes of pumps, etc. Where decompression is required to reduce noise or wear, such as ventilation systems.
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