German astner seals, astner models, astner prices

astner seals are devices that prevent fluid leakage, consisting of 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 a compensation mechanism, in conjunction with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are sometimes used as auxiliary seals; however, since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

astner Seal Classification

1) Packing seal: The packing seal has a simple structure, is inexpensive, and is easy to maintain. However, it has high leakage and significant power loss. Therefore, packing seals are used for transporting general media, such as water; they are generally not suitable for petroleum and chemical media, especially valuable, flammable, explosive, or toxic media. 2) Mechanical seal: Mechanical seals (also known as face seals) offer good sealing performance with minimal leakage and long service life, but they are expensive and have higher requirements for machining, installation, maintenance, and repair compared to general seals. Mechanical seals are suitable for transporting petroleum and chemical media, including those with various viscosities, strong corrosiveness, and particulate content. The American Petroleum Institute standard API610 (8rd edition) stipulates that cartridge mechanical seals shall be installed unless otherwise specified by the user. 3) Dynamic seal: Dynamic seals can be divided into back-vane seals and auxiliary impeller seals. During pump operation, the centrifugal force of the back vanes (or auxiliary impeller) reduces the medium pressure at the shaft seal to atmospheric or negative pressure, preventing leakage. When the pump stops, the centrifugal force disappears, and the sealing effect of the back vanes (or auxiliary impeller) fails; at this point, the shutdown sealing device provides the seal. Packing seals are frequently used in shutdown sealing devices paired with back-vane (or auxiliary impeller) systems. Packing seals come in two types: standard and mechanically adjustable. Standard packing seals are similar to those in general packing seal pumps, requiring slight positive pressure at the shaft seal to avoid dry friction of the packing. Mechanically adjustable packing seals use counterweights to loosen the packing during pump operation and tighten it when stopped. Dynamic seals are reliable, inexpensive, and easy to maintain, making them suitable for media containing many solid particles, such as slurry pumps and feed slurry pumps in the phosphate industry. The disadvantages are greater power loss compared to mechanical seals and shorter service life of the shutdown sealing device. The seal between the rotating pump shaft and the stationary pump casing is called the shaft seal. Its function is to prevent high-pressure liquid from leaking out along the shaft or outside air from entering along the shaft. For centrifugal pumps, the shaft seal is a dynamic seal. Depending on whether the sealing surfaces are in contact, dynamic seals are classified as contact or non-contact. In contact dynamic seals, the sealing device contacts the shaft, resulting in relative friction. Contact dynamic seals include packing seals and mechanical seals.

astner Seal Operation

1) If slight leakage occurs after the pump starts, observe it for a period. If the leakage does not decrease after continuous operation for 4 hours, stop the pump for inspection. 2) The pump operating pressure should be stable, with pressure fluctuations not exceeding 1 kg/cm². 3) During pump operation, avoid cavitation to prevent dry friction and damage to the sealing surfaces. 3) Regularly inspect the sealing condition. During operation, if leakage exceeds the standard (no more than 5 drops/min for heavy oil, no more than 10 drops/min for light oil), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

astner Seal Common Issues

Preventing leakage through effective sealing is a perpetual pursuit for chemical process equipment. It is this requirement that has driven 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. Issues include 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. The following is a brief introduction to basic aspects of sealing: 1. Sealing types For static seals, there are typically 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, relying primarily on mechanical seals. Mechanical seals are categorized as single-face or double-face, and balanced or unbalanced. 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 factor; furthermore, having no hardness difference between the two rings is also unreasonable. 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).

Weidou Intelligent Technology specializes in selling German astner seals, astner O-rings, astner sealing strips, astner pipe seals, astner cable seals, astner rubber seals, astner mechanical seals, astner gaskets, astner oil seals, astner shaft seals, astner metal seals, astner high-pressure seals, astner spiral seals, astner centrifugal seals, astner sealing rings. astner original imports from Germany. Welcome inquiries and orders.