Germany Hawe seals Hawe model Hawe price

Hawe seals utilize the "container" concept from transportation to create cartridge seals. The rotating and stationary parts of this seal are pre-assembled into a single unit before installation. After passing inspection and pressure testing, the unit is mounted on the shaft within the stuffing box, fixed to the shaft with set screws, and the gland bolts are tightened. Once the cartridge positioning tabs are removed, the mechanical seal operates with parallel faces and is ready for service. This approach not only simplifies assembly but also ensures assembly quality. Welded metal bellows mechanical seals are all designed as cartridge seals, offering the aforementioned advantages. Cassette seals are also a type of cartridge mechanical seal. In this seal, the stationary ring, rotating ring, sleeve, gland, and auxiliary seals are all assembled together on a single sleeve before installation, facilitating inspection of assembly quality. After passing inspection, simply tighten the seal cover and secure the screws. This pre-assembled, inspected, and tested seal component makes it easier to ensure installation and assembly quality.

Hawe seal principle

An oil film controlled by the oil seal lip exists between the oil seal and the shaft, possessing 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 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 at the sealing surface.

Hawe seal applications

Skeleton oil seals are widely used in aviation, automotive, motorcycle, railway, vehicle, shipbuilding, home appliance, and construction machinery industries. They are suitable for sealing rotating and reciprocating motions. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Primarily prevents permeation of the sealed medium (gas, liquid) and entry of external foreign matter into the body. Precautions: Standard oil seals have a very limited pressure range, generally 0.03 MPa. This pressure is typically generated by the height difference of the lubricating oil itself. If higher pressure sealing is required, select high-pressure oil seals (generally capable of withstanding up to 1 MPa pressure) or choose other sealing forms.

Hawe seal installation precautions

1) Pay close attention during installation 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 fit clearance (i.e., concentricity) between the gland and the outer diameter of the shaft or sleeve; it must be uniform around the circumference. Check all points with a feeler gauge; the allowable error must not exceed 0.01 mm. 2) Spring compression must be performed according to regulations; excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases specific face pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the rotating ring, pressing it against the spring should allow it to spring back automatically. 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. When installing the mechanical seal on the machine, carefully compare it with the general assembly drawing before installation to confirm that all parts are ready. At this stage, check for 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 sleeve contacting the packing and sealing rings (O rings), as well as on flanges and other components. If any abnormalities are found, replace or repair before use. During actual installation, do not bring excess parts 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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