German OSW seals OSW models OSW prices

OSW seals are devices that prevent fluid leakage, consisting of at least one pair of faces perpendicular to the axis of rotation that remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, together with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are also used as auxiliary seals; since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

OSW seal operating principle

An oil film controlled by the oil seal lip exists between the oil seal and the shaft, and this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes it to form a meniscus at the interface with air, preventing leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of an oil seal depends on the thickness of the oil film on the sealing surface: if the thickness is excessive, the oil seal will leak; if too small, 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 centerline. If not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, leading to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant to seep from the housing to maintain an oil film at the sealing surface.

OSW seal applications

Skeleton oil seals are widely used in industries such as aviation, automotive, motorcycles, railways, vehicles, ships, home appliances, and construction machinery. They are suitable for sealing rotary and reciprocating motion. They are installed on heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Their main function is to prevent the sealed medium (gas or liquid) from penetrating and to prevent external contaminants from entering the equipment. Precautions: Standard oil seals have a very limited pressure range, typically 0.03 MPa. This pressure is generally formed by the height difference of the lubricating oil itself. If higher pressures need to be sealed, high-pressure oil seals (generally capable of withstanding up to 1 MPa) or other sealing types should be selected.

OSW seal installation precautions

1) During installation, great care must be taken to avoid installation deviations. Tighten the gland after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the gland face. Check all points with a feeler gauge; the error must not exceed 0.05 mm. Check the mating clearance (i.e., concentricity) between the gland and the outer diameter of the shaft or shaft sleeve; it must be uniform around the circumference. Check all points with a feeler gauge; the permissible error must not exceed 0.01 mm. 2) Spring compression must be performed according to specifications; excessive or insufficient compression is not allowed. The required error tolerance is 2.00 mm. Excessive compression increases the specific face pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the rotating ring, it should automatically spring back when pressed against the spring. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. Before installing the mechanical seal on the machine, carefully compare it with the general assembly drawing to confirm that all parts are ready. Pay attention to any abnormalities such as scratches or damage on the sealing faces of the friction pair and sealing rings. Also check for scratches on the surfaces of the shaft or shaft sleeve and flanges that come into contact with packing and sealing rings (O rings). If any abnormalities are found, replace or repair before use. During actual installation, do not bring more parts than necessary to the site. If parts remain after installation, it indicates missing components; if parts are insufficient, it means unnecessary components were assembled, thus serving as a self-check during installation.

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