Optimal speed control:
Cavitation occurs when changes in pump pressure lead to the intense formation and collapse of air bubbles in a liquid. This generates heat and shock waves that can lead to issues including reduced pump efficiency, increased noise, mechanical wear, and damage to the pump housing, the diaphragm, and other components. In pump systems, cavitation happens when the
local pressure drops below the pumped liquid’s vapor pressure, such as during high-speed flow or in areas of turbulence. Controlled pressure and flow, along with advanced pump design, are essential to reducing or eliminating the effects of pump cavitation and maintaining the integrity and efficiency of the pump system.
Diaphragm pumps can handle a wide range of fluids – fromcorrosive, abrasive and low-viscosity substances to delicate liquids. Changes in the liquid mixture can affect
pump performance and system integrity. KNF has developed diaphragm pumps that use special BLDC (brushless DC) technology to
offer precise pump control and performance. This means the pump’s flow rate can be matched to the fluid being handled.
Diaphragm pumps are a premium choice for handling sensitive, abrasive, and shear-sensitive media. However, cavitation can impact the quality and integrity of any substance being pumped. Cavitation damage is particularly significant
in pharmaceutical, food processing and ink manufacturing wheremaintaining liquid quality is essential. With the sensitivity of these substances, industries need to implement strategies to minimise cavitation effects in their pump systems.
Preventing cavitation damage in diaphragm pumps is vital formaintaining good operational efficiency, meeting the pump’s performance curve, and protecting sensitive substances. Proper pump sizing and speed control are also essential, as is regular maintenance. Smooth Flowpump technology: Smooth Flow
technology can prevent cavitation in diaphragm pumps. This design prioritises low pulsations and pressure fluctuations, promoting a consistent and steady liquid flow. By minimising disruptions in flow, Smooth Flow pumps reduce the formation of vapor bubbles, reducing the risk of cavitation.
Another strategy is to choose a larger pump that operates at lower speeds, which contribute to maintaining suction pressure above the vapor pressure of the liquid being pumped. This reduces pressure drops, helping to reduce/prevent cavitation. Diaphragm movement optimisation: Selecting
a diaphragm pump with a smaller eccentric offers another possibility for cavitation prevention. By minimising the diaphragm’s movement during pump operation, this reduces the occurrence of pressure fluctuations that can cause cavitation. Notably, this feature benefits applications where precise fluid handling is essential, ensuring stable and reliable pump performance while minimising the risk of cavitation issues. However, using a smaller eccentric will also lead to reduced pressure and flow rate performance. By implementing these preventive measures,
industries can minimise the detrimental effects of cavitation increases on pump performance and ensure the reliable operation of liquid systems. However, bespoke pump designs offer a custom approach to help avoid cavitation damage by addressing specific end-user requirements and effectively minimising cavitation risks.
GAS AND LIQUID PUMP SOLUTIONS TAILORED TO YOUR APPLICATION
KNF –Your partner for customised pump solutions
KNF Neuberger UK Ltd
info.uk@
knf.com
knf.com
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