German velco seals velco model velco price

velco seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, along with auxiliary seals. Mechanical seals where the auxiliary seal of the compensation ring is a metal bellows are called bellows mechanical seals. There are mainly the following four types of components. a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seat and keys or fixing screws.

velco seal principle

An oil film controlled by the lip of the oil seal 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 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 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, heating and wear are likely to occur. 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 the housing to achieve the formation of an oil film at the sealing surface.

velco 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 motion. 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: The pressure-bearing range of ordinary oil seals is very limited, generally 0.03 MPa. This pressure is typically generated by the height difference of the lubricating oil itself. If higher pressure sealing is required, high-pressure oil seals (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be selected.

velco 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 box 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 and differential expansion, and in severe cases, cause dynamic-static 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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