German Keller seals, Keller models, Keller prices

Keller seals are devices that prevent fluid leakage, consisting of at least one pair of 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 a compensation mechanism, in conjunction with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are also used as auxiliary seals; however, since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

Keller seal types

1) Squeeze-type seals: Squeeze-type seals, particularly O rings, have always been widely used in sealing applications. Other types, such as X, T, D, square, and triangular profiles, are suitable for various applications. Improvements focus on ensuring stable and reliable sealing performance, increasing pressure resistance, and reducing friction. They can also be combined with low-friction plastics such as PTFE or nylon sliding rings and support rings to form composite seals, thereby enhancing pressure resistance and reducing friction. Some manufacturers' products are rated for speeds up to 7.5m/s and sealing pressures up to 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip gaskets or cups, are widely used for dynamic sealing in hydraulic reciprocating cylinders. The pressure-bearing surface is lip-shaped, with a minimal interference fit during installation to ensure full contact between the lip edge and the sealing surface. During cylinder operation, as pressure increases, the contact force and area increase, improving sealing performance. During the return stroke, pressure decreases, and both contact area and friction are lower than during the working stroke, creating a breathing effect that lubricates the lip. There are many types of reciprocating seals, commonly including J, L, U, V, and Y types. Various combination and composite seals are also available, such as U-cup, V-ring, and multi-lip seals. Extrusion must be prevented under high pressure by selecting materials with sufficient tear strength, hardness, and modulus, or by using support rings or reinforced elastomers. Seals used in high-pressure, high-speed, or high-temperature environments often employ composite seals. Their common feature is having two lips in contact with the cylinder wall. A groove in the middle of the sealing area stores media, improving lubrication, reducing lip wear, and ensuring reliable sealing. Lip seals for pneumatic systems are required to operate without oil lubrication; some designs integrate a dust wiper with the seal. 3) Rotary shaft lip seals: There are no fewer than 200 varieties of similar structures, such as hydrodynamic, inner-cage, assembled, outer-cage, PTFE-bonded AF type, and dual-modulus return-flow types. The advantage of outer-cage assembled types is accurate positioning, high concentricity, and good heat dissipation. They remain stable under pressure and vibration, resulting in longer service life and saving rubber material. The dual-modulus return-flow type applies wave seal theory; by adding a low-modulus, easily deformable material at the sealing contact point, a return-flow effect is achieved, while also reducing product design and mold processing costs. Joints between rigid waterproof layers and gable walls, parapet walls, and protruding roof structures should be properly treated with flexible sealing.

Keller seal influencing factors

Hydraulic seals play a crucial role in the integrity of hydraulic and pneumatic systems. If the seals on a hydraulic or pneumatic component are inadequate, the component itself cannot be considered a quality product. Many factors affect seal performance. First, pressure is a significant factor; the magnitude of pressure and the duration of pressure cycles greatly impact seal damage (such as extrusion). The higher the pressure, the greater the influence of other factors on seal performance, such as temperature, speed, seal material, clearance between piston and cylinder barrel, and clearance between piston and cylinder head. Another factor is temperature and friction. It is difficult to define the maximum and minimum operating temperatures for a seal material because this is the result of a combination of factors. Operating temperatures for pistons and piston rods differ, so they must be selected accordingly. Additionally, seal surface roughness, surface characteristics, pressure, media, temperature, seal material, seal type, and motion speed all influence seal performance. Finally, surface treatment is critical; experience shows that the surface characteristics of cylinder pistons and piston rods significantly affect seal life. Surface characteristics are commonly defined by the RA value, which is the arithmetic mean of the absolute deviations of the surface profile from the centerline. However, these values do not fully represent the impact of surface conditions on seals, as different surface texture features can cause varying degrees of seal wear even at the same roughness level.

Keller seal installation and shutdown

1) Before starting, keep the seal chamber filled with liquid. When conveying solidifying media, use steam to heat the seal chamber to melt the media. Manual rotation must be performed before starting to prevent sudden startup from causing the soft ring to shatter. 2) For mechanical seals utilizing an external flush oil system, start the flush oil system first. Stop the flush oil system last after shutdown. 3) After stopping a hot oil pump, do not immediately stop the cooling water for the flush chamber and face seal. Wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging the seal parts.

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