German waldeisen seals waldeisen models waldeisen prices

waldeisen seals are the customary term for general seals; simply put, they are seals for lubricating oil. They are mechanical components used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the parts requiring lubrication in the transmission assembly from the output parts to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seal is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber; the term oil seal generally refers to this type of tc skeleton oil seal.

waldeisen seal classification

1) Packing seal: The packing seal has a simple structure, low price, and convenient maintenance. However, it has high leakage and high 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, and toxic media. 2) Mechanical seal: Mechanical seals (also known as face seals) provide good sealing performance, very low leakage, and long service life, but they are expensive, and their processing, installation, maintenance, and repair requirements are higher than those of general seals. Mechanical seals are suitable for transporting petroleum and chemical media and can be used for media with various viscosities, strong corrosiveness, 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. When the pump is operating, the centrifugal force of the back vanes (or auxiliary impeller) reduces the pressure of the medium at the shaft seal to atmospheric or negative pressure, preventing leakage during use. When stopped, the centrifugal force disappears, and the sealing effect of the back vanes (or auxiliary impeller) fails; at this time, the stop-sealing device provides the sealing function. Packing seals are commonly used in the stop-sealing devices matched with back-vane (or auxiliary impeller) types. Packing seals come in two types: ordinary and mechanically adjustable. Ordinary packing seals are similar to general packing seal pumps, requiring micro-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 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 stop-sealing device. The seal between the rotating pump shaft and the fixed 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, 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.

waldeisen 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 operating pressure of the pump 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) Check the sealing condition frequently. 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.

waldeisen seal precautions

1) Collect the fixed quantity of oil seals. 2) Keep clean from receipt to assembly. 3) Before assembly, inspect the oil seal. Measure whether the dimensions of the skeleton oil seal match the shaft and housing dimensions. Before installing the skeleton oil seal, clearly compare the shaft diameter with the inner diameter of the oil seal; they must match. The internal dimensions of the housing must suit the outer diameter width of the oil seal. Check whether the lip of the skeleton oil seal is damaged or deformed, and whether the spring has fallen off or rusted. Prevent the oil seal from being placed flat during transportation, subjected to external squeezing and impact, which may destroy its roundness. 4) Perform machining inspection procedures before assembly. Measure whether the dimensions of the housing and shaft are correct, especially the internal chamfer, which must not have a slope. The end faces of the shaft and housing must be smooth, with no damage or burrs on the chamfers. Clean the assembly area. There must be no burrs, sand, iron chips, or other debris at the shaft insertion area (chamfer), as these can cause irregular damage to the oil seal lip. It is recommended to use an r angle for the chamfer. 5) Operationally, you can feel with your hand whether it is smooth and truly round. 6) Do not tear open the packaging paper of the skeleton oil seal too early before installation to prevent debris from adhering to the seal surface and entering into operation. 7) Before installation, apply an appropriate amount of lithium-based grease with molybdenum disulfide between the lips of the skeleton oil seal to prevent dry friction on the lip during instantaneous start-up of the shaft, which affects the interference fit of the lip, and assemble as soon as possible. If the oil seal seat with the installed oil seal is not immediately mounted, cover it with a cloth to prevent foreign matter from adhering to the seal. Hands or tools applying lithium grease must be clean. 8) Skeleton oil seals must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. Do not apply excessive pressure; the speed should be uniform and slow. 9) Mark the machine on which the skeleton oil seal is installed for tracking, and pay close attention to the entire process.

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