Brief introduction to the structure and principle of differential pressure flowmeter
The differential pressure flowmeter consists of a primary device (detection piece) and a secondary device (differential pressure conversion and flow display instrument). Differential pressure flowmeters are usually classified in the form of detection parts, such as orifice flowmeters, Venturi flowmeters, and uniform velocity tube flowmeters.
The secondary devices are various mechanical, electronic, electromechanical integrated differential pressure gauges, differential pressure transmitters and flow display instruments. It has developed into a large class of instruments with a high degree of three modernizations (serialization, generalization and standardization) and a large variety of specifications. It can measure flow parameters and other parameters (such as pressure, level, density, etc.) ).
The detection parts of the differential pressure flowmeter can be divided into several categories according to their working principles: throttling device, hydraulic resistance type, centrifugal type, dynamic pressure head type, dynamic pressure head gain type and jet type.
Test pieces can be divided into two categories according to their degree of standardization: standard and non-standard.
The so-called standard detection part is designed, manufactured, installed and used according to the standard documents, and its flow value and estimated measurement error can be determined without actual flow calibration.
Non-standard test pieces are less mature and have not yet been included in international standards.
Differential pressure flowmeter is the most widely used flowmeter, and its usage occupies the first place among all kinds of flowmeters. In recent years, due to the advent of various new flowmeters, its usage percentage has gradually decreased, but it is still the most important type of flowmeter.
