German Hunger seals Hunger models Hunger prices

Hunger 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 seals achieve sealing by imparting kinetic energy to the medium during machine operation, hence they are sometimes called power seals.

Hunger seal construction

The skeleton oil seal structure consists of three parts: the seal body, the reinforcing skeleton, and the self-tightening helical spring. The seal body is divided into the bottom, waist, cutting edge, and sealing lip according to different parts. Typically, in the free state, the inner diameter of the skeleton oil seal is smaller than the shaft diameter, meaning it has a certain "interference fit." Therefore, after the oil seal is installed in the seal housing and on the shaft, the pressure of the oil seal cutting edge and the contraction force of the self-tightening helical spring exert a certain radial tightening force on the shaft. After a period of operation, this pressure will rapidly decrease or even disappear, so the spring can compensate for the self-tightening force of the oil seal at any time.

Hunger seal usage guide

1) When the gearbox lubricating oil volume is ≤7 liters, the addition amount per liter of lubricating oil is 20‐30ml; 2) 7‐15 liters, the addition amount is 15‐20ml per liter of lubricating oil; 3) >15 liters, the addition amount is 10ml per liter of lubricating oil; 4) Oil seals not in temporary use should be properly stored to prevent contamination with oil, dust, or exposure to sunlight. 5) When the shaft diameter wears into a "V" shaped groove, causing the contact pressure between the new oil seal lip and the shaft to drop and fail to seal oil, the displacement method can be used for compensation.

Hunger seal common questions

The perpetual pursuit for chemical equipment is zero leakage from sealing issues, which has driven the increasingly widespread application of magnetic drive pumps and canned motor pumps. However, there is still a long way to go to truly achieve zero leakage, such as the service life of the isolation sleeve in magnetic drive pumps and the can in canned motor pumps, pitting corrosion of materials, the need for sealing materials with good corrosion resistance, and the reliability of static seals, among others. 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, 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 further divided 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, with its pressure generally 0.07 to 0.1MPa higher than the media pressure. 2. Sealing materials The material for static seals in chemical pumps is generally fluororubber, with PTFE materials 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 factor, and it is also unreasonable if there is no hardness difference between the two. Therefore, it is best to select materials based on the characteristics of the media (Note: The American Petroleum Institute API610 Eighth Edition provides relatively detailed specifications for typical configurations of mechanical seals and piping systems in Appendix D).

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