German GORE seals GORE models GORE prices

GORE seals can be divided into two major categories: static seals and dynamic seals. Static seals mainly include three types: gasket seals, sealant seals, and direct contact seals. According to working pressure, static seals can be further divided into medium and low-pressure static seals and high-pressure static seals. Medium and low-pressure static seals commonly use gasket seals made of softer materials with wider widths, while high-pressure static seals use metal gaskets made of harder materials with very narrow contact widths. Dynamic seals can be divided into two basic types: rotary seals and reciprocating seals. Others can be classified as contact seals and non-contact seals based on whether the seal contacts the components moving relative to it; they can also be divided into circumferential seals and face seals based on the seal and contact position, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic seals achieve sealing by imparting kinetic energy to the medium during machine operation, hence they are sometimes called power seals.

GORE seal principles

Due to the oil film controlled by the oil seal lip between the oil seal and the shaft, this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end of the oil film 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 the 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 centerline; if not perpendicular, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant in the housing to seep out to achieve the state of forming an oil film at the sealing surface.

GORE 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 rotary and reciprocating motion. They are installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other parts. Their main function is to prevent the penetration of sealed media (gas, liquid) and the 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 (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be selected.

GORE seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can easily cause steam leakage from the shaft seal, which is prone to water ingress into the oil, leading to deterioration of turbine oil quality. Excessively high shaft seal pressure will cause the equalizing box safety valve to actuate, 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 the 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 gap between the rotor and cylinder, increase steam leakage from the shaft seal, increase differential expansion, and in severe cases, may cause stationary and rotating part friction. When the shaft seal temperature is too low, it will cool the shaft end steam seal and rotor steam seal section; similarly, it will produce local stress concentration phenomena, changing the gap between the cylinder and rotor, increasing steam leakage at the shaft end, and decreasing differential expansion. When the shaft seal temperature is too low, water may also appear in the shaft seal supply steam, 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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