German dgk seals dgk model dgk price

dgk seals refer to devices that prevent fluid leakage, formed by at least one pair of end 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 the compensation mechanism, in conjunction with auxiliary seals. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly the following four types of components. a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seat and keys or fixing screws.

dgk seal principle

Since there is an 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 the 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 centerline. If it is not perpendicular, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant in the housing to seep out slightly to achieve the state of forming an oil film at the sealing surface.

dgk 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 motion. They are installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other parts. They mainly prevent the penetration of the sealed medium (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 needs to be sealed, high-pressure oil seals (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be selected.

dgk 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 sealing conditions: 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), while double-face mechanical seals are primarily used for media that are high-temperature, prone to crystallization, viscous, contain particles, or involve toxic volatiles. Double-face mechanical seals require injecting a barrier fluid into the seal chamber, 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 rotating and stationary rings in mechanical seals is critical; using tungsten carbide against tungsten carbide is not necessarily optimal. Besides the high cost, the lack of hardness difference between the two makes it unreasonable. Therefore, selection should be based on medium characteristics (Note: Appendix D of the American Petroleum Institute API610 Eighth Edition provides detailed specifications for typical configurations of mechanical seals and piping systems).

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