German HALLITE seals HALLITE models HALLITE prices

HALLITE seals are materials or components that prevent leakage of fluids or solid particles from adjacent mating surfaces and prevent external contaminants such as dust and moisture from entering machinery. The recommended storage temperature for seals is below 30 °C to avoid high-temperature aging. Seals are classified into static seals and dynamic seals. Their main function is to prevent leakage of fluids or solid particles from adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery. Static sealing refers to the tight closure of sealed chambers or containers, used for sealing letters and testamentary stamps.

HALLITE seal operating principle

An oil film controlled by the lip edge exists between the oil seal and the shaft, exhibiting fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film forms a meniscus at the air-contact end, preventing leakage of the working medium and thereby achieving rotation shaft sealing. The sealing capability of an oil seal depends on the thickness of the oil film on the sealing surface. If the film is too thick, the oil seal will leak; if too thin, dry friction may occur, causing wear on the oil seal and shaft. If there is no oil film between the sealing lip and the shaft, overheating and wear are likely. Therefore, during installation, some oil must be applied to the sealing ring, and the skeleton oil seal must be kept perpendicular to the shaft axis. If not perpendicular, the sealing lip will wipe the lubricating oil off the shaft, leading to excessive wear of the sealing lip. During operation, slight seepage of lubricant from the housing is ideal to maintain an oil film on the sealing surface.

HALLITE seal functions

The primary function of a skeleton oil seal is to isolate lubricated components in transmission systems from output components, preventing lubricating oil leakage. It is typically used on rotating shafts as a rotary shaft lip seal. The skeleton acts like rebar in concrete, providing reinforcement and allowing the oil seal to maintain its shape and tension. Based on skeleton type, they are classified as inner skeleton oil seals, outer skeleton oil seals, and exposed inner/outer skeleton oil seals. Skeleton oil seals are made from high-quality nitrile rubber and steel plates, offering stable quality and long service life. They are widely used in automobiles and motorcycles on crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, etc. 1) Prevent sand, dust, water vapor, etc., from entering bearings from the outside; 2) Restrict lubricating oil leakage from bearings. Requirements for oil seals include dimensions (inner diameter, outer diameter, and thickness) complying with specifications; appropriate elasticity to fit the shaft properly for sealing; heat resistance, wear resistance, high strength, media resistance (oil, water, etc.), and long service life.

HALLITE seal failure causes

Mechanical seal failures are generally identified only after abnormal leakage, abnormal wear, or abnormal torque occurs. The causes of failure can be broadly categorized into four aspects: 1) Incorrect design or selection of the mechanical seal; 2) Poor quality of the mechanical seal; 3) The machine using or installing the mechanical seal does not meet precision requirements; 4) Incorrect machine operation.

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