The specific selection method of asphalt insulation pump is as follows:
1. Selection of flow characteristics of asphalt heat preservation pump
The flow characteristic of the asphalt heat preservation pump refers to the relationship between the relative flow rate of the medium flowing through the valve and the displacement (relative opening degree of the valve). The ideal flow characteristics mainly include four types: straight line, equal percentage (logarithm), parabola and quick opening. The commonly used ideal flow characteristics are only straight lines, equal percentages (logarithmic), and quick opening. The parabolic flow characteristics are between straight and equal percentages. They can generally be replaced by equal percentage characteristics. The fast opening characteristics are mainly used in two-position adjustment and program control. Therefore, the selection of asphalt insulation pump characteristics is actually straight line and equal percentage flow. The choice of features.
2, the choice of the role of asphalt insulation pump
The function of the asphalt heat preservation pump is only when the pneumatic actuator is selected, and its action mode is formed by the combination of the positive and negative action of the actuator and the positive and negative action of the valve. There are 4 kinds of combined forms, namely, positive (gas-closed), positive and negative (air-open), anyway (air-open), anti-reverse (air-closed), and the asphalt insulation pump formed by these four combinations has Both gas and gas are off. The choice of the mode of action of the asphalt insulation pump is mainly considered from three aspects:
(1) Process production safety;
(2) characteristics of the medium;
(3) Guarantee product quality and minimize economic loss.
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