German ITW seals, ITW models, ITW pricing

ITW seals are a typical example of oil seals. The term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is typically to isolate lubricated components in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. Based on structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves as a dust seal, preventing external dust, impurities, etc., from entering the machine interior. Based on skeleton type, they can be classified as internally enclosed skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. They are used in locations such as gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, and axles.

ITW seal principle

Due to the oil film controlled by the oil seal lip edge between the oil seal and the shaft, this oil film possesses fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end where the oil film contacts 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 prone 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 not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, also leading 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 state of forming an oil film at the sealing surface.

ITW 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 rotating motion and reciprocating motion. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other locations. Primarily prevents penetration of the sealed medium (gas, liquid) and entry of external foreign matter into the body. Precautions: The pressure-bearing range of ordinary oil seals is very limited, generally 0.03 MPa. This pressure is generally formed by the height difference of the lubricating oil itself. If higher pressure sealing is required, high-pressure oil seals should be selected (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be chosen.

ITW seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure easily causes steam emission from the shaft seal, prone to water ingress into the oil, causing deterioration of turbine oil quality. Excessively high shaft seal pressure will trigger the action of the equalizing tank safety valve, wasting working fluid and damaging equipment. Too low shaft seal pressure may cause a drop in unit vacuum, allowing cold air to enter the shaft seal, or even into the cylinder, causing cooling of the shaft seal section or inside the cylinder, seriously threatening equipment safety. 2) Impact of abnormal shaft seal temperature on the unit: When shaft seal temperature is too high, especially before unit startup, if the temperature is too high, it will cause intense heating at the shaft end steam seal and rotor steam seal section, producing local stress concentration phenomena, thereby causing certain deformation, which may change the clearance between the rotor and cylinder, increase shaft seal steam leakage, increase differential expansion, and in severe cases, may cause stationary-to-rotating part friction. When shaft seal temperature is too low, it will cause cooling of the shaft end steam seal and rotor steam seal section; similarly, it will produce local stress concentration phenomena, changing the clearance between the cylinder and rotor, increasing shaft end steam leakage, and decreasing differential expansion. When shaft seal temperature is too low, water carryover in the shaft seal supply steam may also occur, causing water hammer in the shaft seal supply steam pipeline. In severe cases, this leads to water ingress into the turbine.

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