German bema seals bema models bema prices

bema seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearing of compressors or other fluid handling equipment. They are also sealing devices installed to prevent leakage at the pump shaft and housing. Common types of shaft seals include packing seals, mechanical seals, and hydrodynamic seals. The shaft seal of a reciprocating pump is typically a packing seal. When transporting media where leakage is not permitted, diaphragm reciprocating pumps can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and hydrodynamic seals.

bema seal 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 the end in contact with air to form a meniscus, 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 too great, the oil seal will leak; if the thickness is 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, it is easy to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton oil seal is perpendicular to the shaft axis. If it is not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant to seep out from within the housing to achieve the formation of an oil film at the sealing surface.

bema seal function

The general function of a skeleton oil seal is to isolate components requiring lubrication in transmission parts from output components, preventing lubricating oil from leaking. It is typically used on rotating shafts and is a type of rotating shaft lip seal. The skeleton acts like reinforcing steel 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 into inner skeleton oil seals, outer skeleton oil seals, and exposed inner and 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 that dimensions (inner diameter, outer diameter, and thickness) must comply with regulations; they must have appropriate elasticity to properly grip the shaft and provide a sealing effect; they must be heat-resistant, wear-resistant, high-strength, resistant to media (oil or water, etc.), and have a long service life.

bema seal troubleshooting

1) Main factors causing oil seal leakage: Poor sealing of the oil seal is the primary factor causing leakage. When the shaft wears and forms grooves, even replacing it with a new oil seal may not achieve proper sealing. This is due to reduced contact pressure between the oil seal lip and the shaft, resulting in insufficient interference fit between the installed oil seal lip diameter and the shaft diameter. Taking the S195 diesel engine crankshaft oil seal as an example, the main reasons for poor sealing are analyzed as follows: (1) Poor manufacturing quality of the oil seal; (2) Poor quality of the shaft or bearing; (3) Improper use and maintenance; (4) Improper installation; (5) Improper storage, leading to adverse effects from environmental contamination. 2) Countermeasures for leakage due to poor oil seal sealing: Acquire basic knowledge to identify counterfeit and inferior products, and purchase high-quality, standard-compliant oil seals. During installation, if the outer surface roughness of the shaft diameter is low, or if there are defects such as rust spots, corrosion, or burrs, polish it smooth with fine sandpaper or an oil stone. Apply clean engine oil or lubricating grease to the oil seal lip or the corresponding position on the shaft diameter. Apply sealant to the outer ring of the oil seal. Wrap the keyway area on the shaft with hard paper to avoid scratching the oil seal lip. Use a special tool to rotate and press the oil seal inward. Never hammer or force it, to prevent deformation of the oil seal or breakage of the spring, which would cause failure. If lip flipping, spring detachment, or oil seal skewing occurs, it must be removed and reinstalled. Note: Do not arbitrarily tighten the inner spring when the shaft diameter is not worn and the oil seal spring tension is sufficient. Oil seals used in machinery generally operate under harsh conditions, with large ambient temperature differences, abundant dust, and frequent vibration causing constantly changing stress conditions on components. Therefore, frequent inspection, maintenance, and upkeep are required. If the shaft diameter and bearing are severely worn, or if the oil seal rubber is aging or the spring has failed, repair and replace the corresponding parts promptly. Troubleshoot components or assemblies exhibiting abnormal heating immediately. Avoid mechanical overspeeding and overloading to prevent increased temperature at the oil seal lip, rubber aging, and premature lip wear. Regularly check the engine oil level. If the engine oil contains excessive impurities, such as alloy powder or metal iron filings, completely replace it with new engine oil. The brand and quality of the replacement engine oil must meet seasonal requirements. It is recommended to add Metraile Super Sealant & Lubricant to the engine oil. It is an excellent gearbox additive that forms an inert material film on components, which can reduce oil seal leakage, extend the service life of oil seal gears, and reduce gearbox noise. The use of this Metraile super sealant lubricant will not contaminate the oil or cause deterioration.

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