Definition
The diaphragm pump is actually an embolic pump that separates the liquid to be separated from the column and the pump cylinder by means of a membrane, thereby protecting the column and the pump cylinder. The part of the diaphragm that is in contact with the liquid on the left side is made of a corrosion-resistant material or coated with a layer of corrosion-resistant material, the right side of the diaphragm is filled with water or oil.
Combination
There are 4 types of combination: positive (gas-closed), positive and negative (air-open), anyway (air-open), anti-reverse (air-closed)
Considerations: a) process production safety; b) characteristics of the medium; c) product quality assurance, economic loss is minimal.
Flow characteristics
The flow characteristic of the diaphragm pump refers to the relationship between the relative flow rate of the medium flowing through the valve and the displacement (relative opening 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.
Specifically consider the following aspects:
1 From the adjustment quality of the adjustment system analysis and selection.
2 Considering the situation of process piping.
3 Analysis from load changes.
