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差压计或差压变送器与节流件配套进行流量测量时,由于用户为制造厂提供的参数不准,或者由于生产工艺的变更,设备的更新改造等,会使流体的实际参数与节流件设计时所采用的流体参数不同,从而造成流量测量的附加误差。这种附加误差虽然可以采用示值校正的办法减小,但由于存在着计算繁杂,示值不直观等缺点,在使用上受到限制,通常采用更改节流件的办法。考虑到在实际运行中变更的只是个别参数,若能在原设计的基础上改变个别参数而达到更改节流件孔径的目的,将使计算大大简化。角接取压标准孔板和标准喷咀使
Differential pressure or differential pressure transmitters and flow pieces supporting the flow measurement, due to the user for the manufacturer to provide the parameters are not allowed, or due to changes in production processes, equipment, renovation, etc., will make the actual fluid parameters and Throttle design fluid parameters used in the different, resulting in additional measurement error flow. Although this additional error can be used to reduce the indication correction method, but due to the complexity of calculation, the indication is not intuitive and other shortcomings, is limited in use, the method is usually used to change the throttle. Taking into account the changes in the actual operation of only individual parameters, if the original design can be changed based on the individual parameters to achieve the purpose of changing the throttle aperture will make the calculation greatly simplified. Angle access pressure standard orifice and standard nozzle make