How should we select Gear Pump Accessories to ensure the sealing effect when conveying high viscosity media?

In the process of conveying high-viscosity media, gear pumps are widely used due to their compact structure, smooth conveying, and high-pressure resistance. However, the special physical properties of high-viscosity fluids place higher requirements on the sealing performance of the pump body. Therefore, the reasonable selection and configuration of gear pump accessories is the key to ensuring the sGear Pump Accessories
aling effect and stable operation of the system. The following analysis is made from the aspects of accessory material, structural design, and auxiliary functions.

The material selection of seals is crucial. High-viscosity media often have strong adhesion and shear stress, which continuously impacts seals. At this time, high-temperature, corrosion-resistant, and wear-resistant sealing materials should be given priority. For example, materials such as PTFE (polytetrafluoroethylene) and FKM (fluororubber) have excellent chemical stability and mechanical strength, can adapt to high-viscosity and high-temperature working conditions for a long time, and reduce the risk of leakage. At the same time, for conveying environments containing particles or abrasive liquids, metal skeleton reinforced sealing structures or mechanical seals can be selected to enhance the pressure-bearing capacity and service life of seals.

The design of mechanical seals or packing seal structures varies depending on the working conditions. For fluids with high viscosity and significant temperature fluctuations, double-end mechanical seals or balanced seal structures should be used to ensure uniform pressure at the sealing interface, strong compensation capability, and less prone to leakage. In addition, the installation accuracy of the sealing structure is also very important. The coaxiality error between the shaft and the seal should be controlled within the specified range to avoid seal failure caused by shaft runout.

Other accessories in the gear pump, such as bearings, sleeves, couplings, etc., also have an indirect effect on the sealing performance. Bearings and sleeves must have high wear resistance and dimensional stability to prevent axial shaking or excessive wear from damaging the sealing structure. It is recommended to use alloy steel, ceramics or self-lubricating materials to improve the overall fatigue resistance of the system.

In addition, in the transportation of high-viscosity media, the pump body is prone to heat due to poor flow, resulting in temperature rise in the sealing part. At this time, you can consider adding cooling devices or temperature control accessories, such as sealing cooling water jackets or external heat sinks, to keep the seal working at a suitable temperature. For high-temperature environments, exhaust valves or back pressure valves are also required to balance the pressure inside and outside the sealing chamber to avoid gas accumulation and leakage.

In the transportation of high-viscosity media, the selection of suitable Gear Pump Accessories must be considered comprehensively from multiple dimensions such as materials, structure, and operating environment. Only through scientific selection and precise matching can the sealing effect be effectively improved, the equipment life be extended, and the efficient and stable operation of the gear pump system be guaranteed.