I have a question about “pressure difference” that I’d like to ask everyone

Pressure difference is just a difference in pressure; what’s the problem? The pressure difference of the pump? Pump outlet pressure minus inlet pressure? Pumps are generally referred to by head rather than pressure difference.

This post was last edited by 3983596_FPPZ on 2019-1-15 at 12:41. Differential pressure is the difference between pressure values; vacuum degree represents this differential pressure and is used to describe negative pressure, which is the difference between atmospheric pressure and absolute pressure (atmospheric pressure > absolute pressure). The greater the vacuum degree, the lower the absolute pressure

At the beginning of learning, understand the relevant basic definitions by referring to the legend, and then you’ll be able to use it effortlessly

Pressure difference is the difference between the pressures at the two ends, right? The pressure difference of a pump is the difference between the pressure at the inlet and the outlet; it is generally referred to as head. A low pressure difference indicates that the flow rate is not good

Pump pressure difference, purrrp differential pressure, refers to the difference between the discharge pressure and the suction pressure of the pump. It represents the increase in energy (pressure energy) obtained by the liquid after passing through the pump. Changes in the pressure difference of the pump will affect its discharge pressure and power. If there is a control valve at the pump outlet, the calculation of the pump pressure drop is as follows: 1. Calculate the total pressure drop in the pipeline. 2. Take 25–30% of this total pressure drop as the pressure drop across the control valve, provided that this value is not less than 0.5 KG. 3. Provide this value to the automation team and the manufacturer in order to determine the CV value of the valve. 4. Calculate the valve pressure drop based on the specifications provided back from them (this is generally not necessary), unless there are other operating conditions that result in significant differences. Additional note: The CV value is a characteristic of the valve, provided by the manufacturer; some reference books offer recommended values. It is advisable to choose a relatively large pressure drop for the control valve; otherwise, its regulating performance will be poor!

Is there an inevitable relationship between vacuum level and the pressure difference of the pump? Seeking an answer

Vacuum level is used to indicate the pressure at the pump inlet, while pressure difference generally refers to the difference between the pressure at the pump outlet and the inlet pressure; it is related to the pump’s head and the specific gravity of the medium, but not to the inlet pressure