German AERO-LIFT Vakuumtechnik seals, AERO-LIFT Vakuumtechnik models, AERO-LIFT Vakuumtechnik prices

AERO-LIFT Vakuumtechnik 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. Based on 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. Depending on whether the seal contacts the components moving relative to it, they can be classified as contact seals and non-contact seals; based on the seal and contact position, they can be classified as 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 kinetic energy to the medium during machine operation, hence they are sometimes referred to as power seals.

AERO-LIFT Vakuumtechnik seal types

1) Squeeze-type seals: Squeeze-type seals, especially O rings, have been widely used in sealing applications. Other types such as X type, T type, D type, square, and triangular shapes are suitable for different applications. Improvements aim to make their sealing performance stable and reliable, increase their pressure resistance, and reduce friction. They can also form combination seals with low-friction plastics such as PTFE and nylon slip rings and support rings to enhance 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 packings or cup seals, are widely used in hydraulic systems for reciprocating cylinder dynamic sealing. The pressure-bearing surface is lip-shaped, with a minimal interference fit during installation, ensuring full contact between the lip edge and the sealing surface to create a seal. When the cylinder operates, as pressure increases, the contact force and area increase, thereby improving sealing. During the cylinder 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 dynamic seals, common ones include J type, L type, U type, V type, and Y type. There are also various combination and composite seals, such as bellows, diaphragm, 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 employing 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 in the middle of the sealing area can store media, improving lubrication, reducing lip wear, and ensuring reliable sealing. Lip seals used in pneumatic systems require operation without oil lubrication, managing contact pressure, 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 dissipation conditions. It remains 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, achieving a return flow effect by adding a low-modulus, easily deformable material at the sealing contact point, which also reduces product design and mold processing costs. Flexible sealing treatment should be applied at the joints between rigid waterproof layers and parapet walls, daughter walls, and protruding roof structures.

AERO-LIFT Vakuumtechnik 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 cannot be considered a good product. Many factors affect seals. First, pressure is a significant factor influencing seal performance; 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. Describing the maximum and minimum operating temperatures for a seal material is difficult because it is the result of a combination of factors. Different operating temperatures for pistons and piston rods require distinct selections. Additionally, seal surface roughness, surface characteristics, pressure, medium, 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 often defined by the RA value, where RA 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 shape features can cause varying degrees of seal wear even at the same roughness level.

AERO-LIFT Vakuumtechnik seal common issues

Preventing leakage through sealing is a perpetual pursuit for chemical equipment. It is this requirement that has led to the increasingly widespread adoption of magnetic drive pumps and canned motor pumps. However, there is still a long way to go to truly achieve zero leakage. For example, issues such as the service life of the isolation sleeve in magnetic drive pumps and the shielding sleeve in canned motor pumps, pitting corrosion of materials, the need for sealing materials with good corrosion resistance, and the reliability of static seals. The following is a brief introduction to some basic situations regarding sealing: 1. Sealing types For static seals, there are usually only two types: gaskets and O-rings. Among O-rings, the O-type ring is the most widely used; For dynamic seals, chemical pumps rarely use packing seals, but mainly use mechanical seals. Mechanical seals are further classified into single-face and double-face, balanced and unbalanced types. Balanced types are suitable for sealing high-pressure media (typically referring to pressures greater than 1.0MPa). Double-face mechanical seals are mainly used for media that are high-temperature, prone to crystallization, viscous, contain particles, or are toxic and volatile. For double-face mechanical seals, a barrier fluid should be injected into the seal chamber. Its pressure is generally 0.07 to 0.1MPa higher than the medium pressure. 2. Sealing materials For static seals in chemical pumps, fluororubber is generally used. PTFE materials are used only in special cases. The material configuration of the rotating and stationary rings in mechanical seals is critical. It is not necessarily best to pair cemented carbide with cemented carbide. High cost is one aspect; it is also unreasonable if there is no hardness difference between the two. Therefore, it is best to handle them differently according to the characteristics of the medium (Note: The American Petroleum Institute API610 Eighth Edition provides relatively detailed provisions for typical configurations of mechanical seals and piping systems in Appendix D).

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