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How to choose the seal accessories of high temperature resistant gear oil pump

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Gear pumps are inseparable from the selection of oil seals at the pump cover when they are assembled, especially for high temperature gear pumps, which require higher seals and do not allow a little leakage.

The commonly used materials for oil seals are: nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane, polytetrafluoroethylene, etc. When selecting the material of the oil seal, it is necessary to consider the compatibility of the material with the working medium, the adaptability to the working temperature range, and the ability of the lip to follow the rotation axis at high speed. Generally, the temperature of the lip of the oil seal is higher than the temperature of the working medium by 20 to 50 ° C. Care should be taken when selecting the oil seal material.

Viton seals are seals made of a copolymer of vinyl fluoride and hexafluoropropylene.

A fluoroelastomer is a copolymer of vinyl fluoride and hexafluoropropylene. According to its molecular structure and fluorine content, the chemical resistance and low temperature resistance of fluoroelastomers are also different. Fluoroelastomers are based on their excellent flame retardancy, excellent air tightness, high temperature resistance, ozone resistance, It is known for its weather resistance, oxidation resistance, mineral oil resistance, fuel oil resistance, hydraulic oil resistance, aromatic resistance and many organic solvents and chemicals.

Because of its excellent flame retardancy, air tightness, high temperature resistance, oil resistance, solvent resistance, flame resistance, chemical resistance and weather resistance, fluoroelastomers are commonly used in the automotive industry, chemical processes, aerospace and many tasks. It is worth mentioning that the fluoroelastomer seal is the only one that can be used under high vacuum conditions. Below 1.33 * 10 -7pa, other rubbers cannot be used for sealing. Excellent manufacturers at home and abroad will be used to produce products, such as Midea's product seals are using this type of material.


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