Tanggu valves are mainly divided into two categories: electric valves and pneumatic valves. The flow characteristics of the Tanggu valve refer to the relationship between the relative flow of the medium flowing through the Tanggu valve and its opening under the condition that the pressure difference between the two ends of the valve remains stable.

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There are three kinds of flow characteristics of Tanggu valve: linear characteristic, equal percentage characteristic and parabolic characteristic. The meanings of the three fluence properties are as follows:

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Equal percentage characteristic (logarithm): The relative stroke and relative flow of the equal percentage characteristic are not in a linear relationship. The change in flow caused by the change of unit stroke at each point of the stroke is proportional to the flow at this point, and the partial ratio of the flow change is equal. Therefore, its advantage is that when the flow rate is small, the flow rate change is small, and when the flow rate is large, the flow rate change is large, that is, it has the same adjustment accuracy at different opening degrees.

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2. Linear characteristic (linear): The relative stroke of the linear characteristic and the relative flow are in a linear relationship. The flow change caused by the change of unit stroke is constant. When the flow rate is large, the relative flow value changes little; when the flow rate is small, the relative flow value changes greatly.

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3. Parabolic characteristics: The flow rate changes according to the quadratic proportion of the stroke, and generally has the central characteristics of linear and equal percentage characteristics.

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From the analysis of the above three characteristics, it can be seen that in terms of its conditioning performance, the equal percentage characteristic is the best, its conditioning is stable, and its conditioning performance is good. The parabolic characteristic has better conditioning performance than the linear characteristic, and any one of the flow characteristics can be selected according to the requirements of the application.