German RITAG seals RITAG models RITAG prices

RITAG seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common shaft seal types include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals.

RITAG 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, and triangular shapes are suitable for different applications. The direction of improvement is to make their sealing performance stable and reliable, increase 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 increase pressure resistance and reduce friction. Some manufacturers' products are rated for speeds up to 7.5m/s and sealing pressures of 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip liners or cup seals, are widely used for dynamic sealing in hydraulic system reciprocating cylinders. The pressure-bearing surface 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 performance. 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 combined and composite seals, such as umbrella-shaped, bud-shaped, 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 for protection, or by using reinforced elastomers. Seals used under high pressure, high speed, or high temperature often use composite combined seals. Their common feature is having two lips in contact with the cylinder wall. A groove in the middle of the sealing area can store medium, improving lubrication, reducing lip wear, and ensuring reliable sealing. Lip seals used in pneumatic systems are required to operate without oil lubrication; contact pressure varies, and 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 skeleton enclosed, assembled type, outer skeleton exposed, bonded PTFE AF type, dual-modulus return flow type, etc. The advantage of the outer skeleton assembled type is accurate positioning, high concentricity, and good heat conduction and dissipation conditions. It remains stable under pressure and vibration, resulting in a longer service life while 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, simultaneously 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.

RITAG 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 substandard, the component itself is not a good product. Many factors affect seals. First, pressure is a significant factor affecting seal quality; 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 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 all influence seals. Finally, 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, where RA is the arithmetic mean of the absolute values of surface profile deviations from the centerline. However, these values do not fully represent the impact of surface conditions on seals, because even at the same roughness, different surface shape characteristics can lead to varying degrees of seal wear.

RITAG seal failure causes

Mechanical seal failures are generally identified only 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 or selection of the mechanical seal; 2) Poor quality of the mechanical seal; 3) The machine using or installing the mechanical seal does not meet precision requirements; 4) Incorrect machine operation.

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