Germany Gestra seals Gestra model Gestra price

Gestra 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. Cartridge seals are also a type of cartridge mechanical seal. In this design, 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. These pre-assembled, inspected, and tested seal components make it easier to ensure installation and assembly quality.

Gestra seal principle

An oil film controlled by the oil seal lip exists between the oil seal and the shaft, and this oil film possesses 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 it is 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 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 small amount of lubricant to seep out from the housing to maintain an oil film at the sealing surface.

Gestra seal function

The primary function of a skeleton oil seal is to isolate components requiring lubrication in transmission systems from output components, preventing lubricating oil leakage. It is typically used on rotating shafts and is a type of rotating shaft lip seal. The skeleton acts like rebar in concrete components, providing reinforcement and allowing the oil seal to maintain its shape and tension. Based on the skeleton type, they can be 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, motorcycles, crankshafts, camshafts, differentials, shock absorbers, engines, axles, front and rear wheels, and other locations. 1) Prevent sand, dust, water vapor, etc., from entering the bearing from the outside; 2) Restrict lubricating oil from leaking out of the bearing. Requirements for oil seals include dimensions (inner diameter, outer diameter, and thickness) that comply with regulations; appropriate elasticity to properly grip the shaft and provide sealing; heat resistance, wear resistance, high strength, resistance to media (oil or water, etc.), and long service life.

Gestra seal installation precautions

1) During installation, pay close attention to avoiding installation deviations. Tighten the gland after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the gland face. Check each point 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 each point 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 complete. 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 sleeve contacting the packing and sealing rings (O rings), flanges, and other components. If any abnormalities are found, replace or repair them before use. During actual installation, do not bring more parts than necessary to the site. If parts remain after installation, it indicates missing components during assembly; if parts are insufficient, it means unnecessary components were assembled, thus serving as a self-check during installation.

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