German Hauser seals Hauser models Hauser prices

Hauser 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 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; based on 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 referred to as power seals.

Hauser 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 thereby 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 axis; if not perpendicular, the sealing lip of the oil seal will wipe the lubricating oil off the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant to seep out from the housing to achieve the state of forming an oil film at the sealing surface.

Hauser 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: The pressure-bearing range of ordinary oil seals is very limited, generally 0.03 MPa. This pressure is generally formed by the height difference of the lubricating oil itself. If higher pressure sealing is required, high-pressure oil seals should be selected (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be chosen.

Hauser seal common questions

The perpetual pursuit for chemical equipment is zero leakage in sealing, which has driven the increasing adoption of magnetic drive pumps and canned motor pumps. However, achieving true zero leakage still has a long way to go, such as addressing the service life of isolation cans in magnetic drive pumps and shielding cans in canned motor pumps, material pitting corrosion issues, the need for highly corrosion-resistant sealing materials, and the reliability of static seals. The following provides a brief introduction to basic aspects of sealing: 1. Sealing types For static seals, there are typically only two forms: gaskets and O-rings, with O rings being the most widely used; for dynamic seals, chemical pumps rarely use packing seals, relying mainly on mechanical seals. Mechanical seals are categorized 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 primarily used for media that are high-temperature, prone to crystallization, viscous, contain particles, or involve toxic volatiles. An isolating fluid should be injected into the seal chamber of double-face mechanical seals, with its pressure generally 0.07 to 0.1MPa higher than the medium pressure. 2. Sealing materials Static seals in chemical pumps typically use fluororubber, with PTFE materials adopted only in special cases. The material configuration of the rotating and stationary rings in mechanical seals is critical. It is not necessarily optimal to pair cemented carbide with cemented carbide; besides the high cost, it is unreasonable due to the lack of hardness difference. Therefore, selection should be based on medium characteristics (Note: The American Petroleum Institute API610 Eighth Edition provides detailed specifications for typical configurations of mechanical seals and piping systems in Appendix D).

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