Mechanical seal leakage is sometimes related to the conveying medium of the corrosion-resistant pump. When the medium is strong in acidity or alkalinity or contains solid particles, it can also cause leakage.

(1) After most of the mechanical seals of submersible sewage pumps are disassembled, the auxiliary seals of the stationary ring and the moving ring are inelastic, and some have rotted, causing a large amount of leakage of the mechanical seal and even the phenomenon of shaft grinding. Due to the corrosive effect of high temperature, weak acid and weak alkali in the sewage on the static ring and the auxiliary rubber seal of the moving ring, the mechanical leakage is too large. The material of the moving and static ring rubber sealing ring is nitrile-40, which is not resistant to high temperature. It is not resistant to acid and alkali, and it is easy to corrode when the sewage is acid and alkali.

Countermeasures: For corrosive media, rubber parts should be fluorine rubber resistant to high temperature, weak acid and weak alkali.

(2) Mechanical seal leakage caused by solid particles and impurities If solid particles enter the end face of the seal, it will scratch or accelerate the wear of the end face. The accumulation of scale and oil on the shaft (sleeve) surface exceeds the wear rate of the friction pair, resulting in The moving ring cannot compensate for the wear displacement, and the operating life of the hard-to-hard friction pair is longer than that of the hard-to-graphite friction pair, because solid particles will be embedded in the sealing surface of the graphite sealing ring.

Countermeasures: The mechanical seal of tungsten carbide to tungsten carbide friction pair should be selected in the position where solid particles are easy to enter.

The corrosion-resistant pump manufacturer Keyikai focuses on the research and development and production of intelligent corrosion-resistant pumps, allowing the pump to work like a human, with zero cost maintenance. The company has many on-site installation engineers with 20 years of industry experience, free of charge for customers to answer on-site installation and maintenance problems.