German Mahle seals Mahle models Mahle prices

Mahle 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 storage room temperature for seals should preferably be below 30 °C to avoid high-temperature aging. Seals can be divided into two main categories: static seals and dynamic seals. Their primary 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 seals.

Mahle seal classification

Seals can be divided into two main categories: static seals and dynamic seals. Static seals mainly include gasket seals, sealant seals, and direct contact seals. Based on operating pressure, static seals can be further divided into medium/low-pressure static seals and high-pressure static seals. Medium/low-pressure static seals commonly use softer, wider gasket seals, while high-pressure static seals use harder metal gaskets with very narrow contact widths. Dynamic seals can be divided into two basic types: rotary seals and reciprocating seals. Additionally, depending on whether the seal contacts the relatively moving component, they can be classified as contact seals and non-contact seals; based on the seal and contact location, they can be divided into circumferential seals and face seals, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic sealing rely on the energy imparted to the medium during machine operation to achieve sealing, hence they are sometimes referred to as power seals.

Mahle seal usage guidelines

1) Select suitable seal materials and hydraulic oil, considering adaptation to operating temperature and compatibility with the oil. 2) High geometric positional accuracy (concentricity) of parts sliding relative to the seal, good material quality (such as hard chrome plating), and fine surface roughness can extend service life. (1) For oil seals used on hydraulic pump and motor shaft journals, not only is a sliding surface roughness of Ra within 0.25m required, but hard chrome plating on the surface is also required. In specific applications, the radial spring force of the oil seal lip must be appropriately adjusted to ensure moderate tightness. During installation, an installation sleeve or thin shim must be used to protect the sealing ring to prevent lip rolling or twisting, which could cause the spring to slip out. (2) The inner surface of hydraulic cylinder barrels is commonly processed by roller burnishing, which not only improves surface roughness but also induces cold work hardening, helping to extend the service life of sealing rings. In addition, operating pressure, sliding surface length, and type significantly affect service life. Therefore, "scheduled inspection" intervals should be determined based on these conditions. (3) Good lubrication of the sealing surface is required to prevent contaminant ingress. Using oil fluids that meet specified cleanliness grades and correct installation methods are also necessary conditions. Seal storage: 1). The storage room temperature for seals should preferably be below 30 °C to avoid high-temperature aging; 2). Seals must be stored in sealed packaging to avoid contact with moisture or dust in the air; 3). Seals must be protected from strong light exposure to avoid erosion by ozone in the air or premature aging. Performance factors vary for different seals; for example, influencing factors for mechanical seals (packing seals, etc.) include temperature, medium, wear, and applied pressure.

Mahle seal installation and shutdown

1) Before startup, keep the seal chamber filled with liquid. When transporting solidified media, use steam to heat the seal chamber to melt the medium. Manual rotation must be performed before startup to prevent sudden startup from causing fracture of the soft ring. 2) For mechanical seals utilizing an external seal oil system, start the seal oil system first. Stop the seal oil system last after shutdown. 3) After stopping a hot oil pump, do not immediately stop the cooling water for the seal oil chamber and face seal. Wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging seal components.

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