German ACTREG limit switch seals, ACTREG limit switch models, ACTREG limit switch prices

ACTREG limit switch seals utilize the "container" concept from transportation to create cartridge seals. The rotating and stationary parts of this seal are pre-assembled into a single unit before installation. After inspection and pressure testing, the unit is mounted on the shaft within the stuffing box, fixed to the shaft with set screws, and the gland bolts are tightened. Once the cartridge positioning tabs are removed, the mechanical seal operates with parallel faces and is ready for service. This approach not only simplifies assembly but also ensures assembly quality. Welded metal bellows mechanical seals are all designed as cartridge seals, offering these advantages. Cartridge seals are also a type of cartridge mechanical seal. In this seal, the stationary ring, rotating ring, sleeve, gland, and auxiliary seals are all assembled together on a single sleeve before installation, facilitating inspection of assembly quality. After passing inspection, simply tighten the seal cover and secure the screws. This pre-assembled, inspected, and tested seal component makes it easy to ensure installation and assembly quality.

ACTREG limit switch 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 for valuable, flammable, explosive, or toxic media. 2) Mechanical seal: Mechanical seals (also known as face seals) provide 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 and can be used with media of various viscosities, strong corrosivity, and containing particles. 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 during use. 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 commonly used in the shutdown sealing devices paired with back-vane (or auxiliary impeller) seals. Packing seals come in two types: standard and mechanically adjustable. Standard packing seals are similar to those in general packing seal pumps, requiring a slight positive pressure at the shaft seal to prevent 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 offer reliable performance, low cost, and easy maintenance, making them suitable for transporting media with 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 of the pump 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, it can be divided into contact dynamic seals and non-contact dynamic seals. In contact dynamic seals, the sealing device contacts the shaft, resulting in relative friction between the two. Contact dynamic seals include packing seals and mechanical seals.

ACTREG limit switch 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 of the seal faces and seal damage. 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.

ACTREG limit switch seal common issues

The perpetual pursuit for chemical equipment is zero leakage from sealing issues, 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 service life concerns for the containment shell in magnetic drive pumps and the can in canned motor pumps, pitting corrosion of materials, the need for highly corrosion-resistant sealing materials, and reliability issues with static seals. The following provides a brief overview of basic sealing aspects: 1. Sealing types For static seals, typically only gaskets and O-rings are used, with O rings being the most widely applied; for dynamic seals, chemical pumps rarely use packing seals, relying primarily 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 mainly used for media that are high-temperature, prone to crystallization, viscous, contain particles, or involve toxic volatiles. An isolation fluid should be injected into the seal chamber for 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 optimal to simply pair cemented carbide with cemented carbide; besides the high cost, it is unreasonable due to the lack of hardness differential. 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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