German KAMAT seals KAMAT models KAMAT prices

KAMAT seals can be divided into two main categories: static seals and dynamic seals. Static seals mainly include 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 are 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 location, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic seals achieve sealing by imparting energy to the medium during machine operation, hence they are sometimes called power seals.

KAMAT 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 thus 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.

KAMAT 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 motions. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other parts. Mainly prevents the penetration of sealed media (gas, liquid) and the entry of external foreign matter into the body. Precautions: Ordinary oil seals have a very limited pressure-bearing range, generally 0.03 MPa. This pressure is generally formed by the height difference of the lubricating oil itself. If higher pressure needs to be sealed, high-pressure oil seals should be selected (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be chosen.

KAMAT seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation have a significant impact on their service life. We generally follow the standards prescribed by the Ministry of Petrochemical Industry. The technical requirements for the pump installing the mechanical seal and the parts mating with the mechanical seal are as follows: 1) Shaft bending: maximum not greater than 0.05 mm; 2) Rotor runout: near the shaft sleeve at the dynamic ring seal ring, not greater than 0.06 mm; 3) Axial shaft movement is not allowed to exceed ±0.5 mm; if equipped with a shaft sleeve, the shaft sleeve must not be loose; 4) Coupling alignment error: for gear couplings, not greater than 0.08～0.10 mm (P2008C), for elastic couplings, not greater than 0.05～0.06 mm; (customary practice: axial runout<0.05, radial runout<0.10) 5) The concentricity tolerance of the gland (static ring seat) and the sealing spigot relative to the shaft centerline is 0.05 mm, and the perpendicularity tolerance of the plane in contact with the gasket relative to the centerline is 0.03～0.05 mm; if requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the dynamic ring seal ring is installed, and the ends of the gland (or housing) where the static ring seal ring is installed, should be chamfered and smoothed. 7) Be careful when installing and removing mechanical seals; strictly prohibit the use of hammers and flat chisels to avoid damaging seal elements. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, take care during assembly and disassembly to prevent neglecting one aspect for another. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the stationary and rotating ring parts must be replaced and should not be re-tightened for continued use. Because after loosening, the original operating trajectory of the friction pair will change, and the sealing performance of the contact surface is easily compromised.

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