German Maier seals Maier models Maier prices

Maier seals can be divided into two main 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-to-low pressure static seals and high-pressure static seals. Medium-to-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; according to the seal and contact position, they can be divided into circumferential seals and face seals, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic sealing achieve sealing by imparting energy to the medium during machine operation, hence they are sometimes called power seals.

Maier seal types

1) Squeeze-type seals: Squeeze-type seals, especially O rings, have been widely used in seals. Other types such as X type, T type, D type, square, triangular, etc., are suitable for different applications. The direction of improvement is to make their sealing performance stable and reliable, improve their pressure resistance, and reduce friction. They can also form combined seals with low-friction plastics such as PTFE and nylon slip rings and support rings to improve pressure resistance and reduce friction. Some manufacturers' products are permitted to reach speeds of 7.5m/s and sealing pressures of 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip liners or cups, are widely used for dynamic sealing in hydraulic system reciprocating cylinders. The pressure-bearing surface of this seal is lip-shaped, with a very small interference fit during installation, allowing the lip edge to fully contact the sealing surface to create a seal. When the cylinder operates, as pressure increases, the contact force and contact area increase, thereby improving sealing. During the cylinder return stroke, pressure decreases, and the 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 dynamic seals, commonly including J type, L type, U type, V type, and Y type. There are also various combination and composite seals, such as bellows type, bud type, multi-lip seals, etc. Extrusion must be prevented under high pressure by selecting materials with sufficient tear strength, hardness, and modulus, or by using support rings for protection, or by using reinforced elastomers. Seals used under high pressure, high speed, or high temperature often use composite combination seals. Their common feature is having two lips in contact with the cylinder wall. A groove is provided in the middle of the sealing area to store medium, improving lubrication, reducing lip wear, and ensuring reliable sealing. Lip seals used in pneumatic systems are required to operate without oil lubrication, with specific contact pressure; some integrate dust wipers with the seal structure. 3) Rotary shaft lip seals: There are no fewer than 200 varieties of similar structures, such as hydrodynamic type, inner-caged skeleton, assembled type, outer-caged skeleton, bonded PTFE AF type, dual-modulus return flow type, etc. The advantage of the outer-caged assembled type is accurate positioning, high concentricity, and good heat conduction and dissipation conditions. It is stable under pressure and vibration, resulting in a 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 (flexible sealing).

Maier seal influencing factors

Hydraulic seals play a crucial role in the integrity of hydraulic and pneumatic systems. If the seals of a hydraulic or pneumatic component are not up to standard, the component itself is not a good product. Many factors affect seals. First, pressure is an important factor affecting seal quality; the level of pressure and the duration of pressure cycle changes greatly impact seal damage (such as extrusion). The higher the pressure, the greater the impact 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 describe 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. Another factor is the surface roughness of the seal product; surface characteristics, pressure, medium, temperature, seal material, seal type, and motion speed are all factors affecting seals. The last factor is surface treatment. Experience shows that the surface characteristics of cylinder pistons and piston rods have a significant impact on seal life. Surface characteristics are commonly defined by the RA value of surface roughness, where RA is the arithmetic mean of the absolute values of surface shape deviations from the centerline. However, these values do not fully represent the impact of surface conditions on seals, because even with the same roughness, different surface shape characteristics can lead to varying degrees of seal wear.

Maier seal failure causes

Mechanical seal failures are generally only discovered after phenomena such as abnormal leakage, abnormal wear, or abnormal torque occur. The causes of failure can be broadly categorized into four aspects: 1) Incorrect design and selection of the mechanical seal; 2) Poor quality of the mechanical seal; 3) The precision of the machine using or installing the mechanical seal does not meet requirements; 4) Incorrect machine operation.

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