1.Flow Rate and Head

During the operation of a rotary lobe pump,the flow rate and head exhibit a typical inverse proportional relationship.When the viscosity of the conveyed medium and the rotational speed are constant,an increase in flow rate leads to a corresponding decrease in head.This relationship forms the basis of the pump's performance curve.Therefore,it is necessary to ensure that the process-required flow rate-head point falls within the pump's high-efficiency operating range.If the actual operating point deviates from the best efficiency zone,it not only increases energy consumption but may also cause operational problems such as cavitation and vibration,affecting the equipment's service life.

2.Flow Rate and Pressure

The relationship between flow rate and working pressure needs to be analyzed through the entire conveying system.The pressure generated by the pump is primarily used to overcome pipeline resistance,and the magnitude of this resistance is directly related to the flow rate.When the system resistance increases(e.g.,due to a partially closed valve or a clogged filter),the flow rate decreases accordingly,while the working pressure increases.

3.Pressure and Head

From a physical essence perspective,there is a definite proportional relationship between the head and the outlet pressure,following the fundamental principle of P=ρgH.The density factor here is crucial:for media of different natures,the same head will produce different outlet pressures.For example,when conveying a high-density medium,the same head results in a higher system pressure.This characteristic requires that the pump's strength design and material selection must comprehensively consider all possible media to be conveyed,ensuring the equipment's safety and reliability under all operating conditions.

The conversion formula between pressure and head is as follows:p=ρgh

That is:Pressure=Density×Gravitational acceleration×Height(i.e.,Head).

H=P/ρ.If P is 1kg/cm²,

Then H=(1kg/cm²)/(1000kg/m³)

H=(1kg/cm²)/(1000 kg/m³)=(10000 kg/m²)/1000 kg/m³=10m.1MPa=10kg/cm²,H=(P₂-P₁)/ρ

(P₂=Outlet Pressure,P₁=Inlet Pressure).

Pressure and head correspond,where a pressure of 1MPa equals a head of 100 meters.Power can be thought of as the capability–how much'force'you have to lift how much water to how great a height.For the same power,a higher head results in a smaller flow rate.The specific calculation of the outlet pressure is based on formulas in fluid mechanics.Valves and elbows on the outlet pipeline have a significant impact on pressure.

Bonve always adheres to the philosophy of "Wholeheartedly Making Good Rotor Pumps," committed to providing global customers with customized conveying and mixing solutions. If you have technical inquiries, selection needs, case references, or other cooperation intentions related to Bonve rotor pumps, please feel free to contact us.  

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