German TEAFLEX seals TEAFLEX models TEAFLEX prices

TEAFLEX 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.

TEAFLEX seal principle

Due to the oil film controlled by the lip of the oil seal between the 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 in contact with air to form a meniscus, preventing the 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, 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 formation of an oil film at the sealing surface.

TEAFLEX 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 in rotary and reciprocating motions. They are installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. Their main function is to prevent the penetration of sealed media (gas, liquid) and the ingress of external foreign matter into the body. Precautions: Ordinary oil seals have a very limited pressure range, generally 0.03 MPa. This pressure is usually 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 pressure) or other sealing forms should be selected.

TEAFLEX seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can easily cause steam leakage from the shaft seal, leading to water ingress into the oil and 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 the cylinder, causing cooling of the shaft seal section or inside the cylinder, which seriously threatens equipment safety. 2) Impact of abnormal shaft seal temperature on the unit: When the shaft seal temperature is too high, especially before unit startup, excessive heat can cause intense heating at the shaft end gland and rotor gland section, resulting in local stress concentration and certain deformation. This may change the clearance between the rotor and cylinder, increase shaft seal steam leakage, increase differential expansion, and in severe cases, cause stationary and rotating part friction. When the shaft seal temperature is too low, the shaft end gland and rotor gland section are cooled, similarly causing local stress concentration, changing the clearance between the cylinder and rotor, increasing shaft end steam leakage, and decreasing differential expansion. Low shaft seal temperature may also result in water carryover in the shaft seal supply steam, causing water hammer in the shaft seal supply pipeline. In severe cases, this can lead to water ingress into the turbine.

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