1. The nature of the liquid, including the name of the liquid medium, physical properties, chemical properties and other properties, physical properties include temperature, density, viscosity, the diameter of solid particles and gas in the medium, which involves the pressure of the system, the required power calculation Types of the right pump: Chemical properties mainly refer to the chemical corrosion and toxicity of the liquid medium. It is an important basis for using oil pump materials and using the shaft seal type.

2. Flow is one of the important performance data for the oil pump. It directly affects the production capacity and transportation capacity of the entire system device. When choosing a pump, based on the maximum flow, it takes into account the normal flow. When there is no maximum traffic, it is usually 1.1 times the normal traffic as the maximum traffic. Generally, the industrial pump can ignore the leakage in the pipeline system in the process, but the impact on flow when the process changes must be considered.

3. The pressure required for the device system is another important performance data for selecting the gear oil pump. Generally, the pressure of the gear pump should be selected with a 5%-10%balance. This includes: oil absorption pool pressure, oil discharge tank pressure, and pressure drop (pressure loss) in the pipeline system.

4. The pipe layout of the oil pump device system refers to the height of the delivery, the distance between the liquid delivery, and the direction of the liquid. In order to perform system pressure calculation and power school check. If the pipeline system data is required, the device characteristic curve should be made. When designing and laying pipes, pay attention to the following matters:

       A. Reasonably select the diameter of the pipeline, the diameter of the pipeline is large, under the same flow, the fluid flow rate is small, the resistance loss is small, but the price is high, the pipe diameter is small 

Large, increase the pressure of the selected pump, increase the power with power, and increase costs and operating costs. Therefore, we should comprehensively consider from the perspective of technology and economy.

B. The excreted side of the pump must be installed with valve and inverse valve. The valve is used to regulate the working point of the pump, and the inverse valve can prevent the oil pump from reversing when the liquid is flowing.

C. The layout of the pipeline should be arranged as a direct pipe as much as possible, minimizing the attachments in the pipeline and shrinking the length of the pipeline. When you must turn it, the bending radius of the elbow should be 3 to 5 times the diameter of the pipeline. ℃.