German legrand seals legrand models legrand prices

legrand seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearings of compressors or other fluid transport equipment. They are also sealing devices installed to prevent leakage at the pump shaft and housing. Common types of shaft seals include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is typically a packing seal. When transporting media where leakage is not permitted, diaphragm reciprocating pumps can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals.

legrand seal classification

1) Packing seal: The packing seal has a simple structure, low price, and is easy to maintain. However, it has high leakage volume 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 with very low leakage and long service life, but they are expensive and have higher requirements for processing, installation, maintenance, and repair compared to 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 (Edition 8) stipulates that cartridge mechanical seals should be equipped unless otherwise specified by the user. 3) Power seal: Power 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 pressure of the medium 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 time, the stop-sealing device provides the sealing function. Packing seals are commonly used in the stop-sealing devices associated with back-vane (or auxiliary impeller) seals. There are two types of packing seals: standard and mechanically adjustable. Standard 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. Power seals offer reliable performance, low price, 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 disadvantage is higher power loss compared to mechanical seals, and the service life of the stop-sealing device is shorter. The seal between the rotating pump shaft and the fixed pump housing is called a 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 contact, it can be divided into contact dynamic seals and non-contact dynamic seals. Contact dynamic seals involve contact between the sealing device and the shaft, with relative friction between them. Contact dynamic seals include packing seals and mechanical seals.

legrand 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 surface. 3) Regularly check the sealing condition. During operation, if leakage exceeds the standard (heavy oil not more than 5 drops/min, light oil not more than 10 drops/min), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

legrand seal functions and applications

Engine: Crankshaft - front and rear crankshaft oil seals; Valve - valve oil seals (engine repair kit o O-rings) (distributor oil seal, water pump oil seal, balance shaft oil seal, oil pump oil seal...); Camshaft - camshaft oil seal; Transmission: Transmission - front and rear transmission oil seals; Shift lever oil seal (transmission repair kit o O-rings) (Transfer case - front and rear transfer case oil seals); Rear axle: Half-shaft - rear half-shaft oil seal; Differential - (front/rear) pinion oil seal; Rear wheel oil seal; Front wheel oil seal; Steering gear oil seal (steering gear repair kit o O-rings); Power steering booster oil seal (front half-shaft oil seal). Oil seals are required wherever there is liquid lubricating oil inside a rotating housing that connects to the exterior. Some are made of rubber, some of metal, and most are steel-cased rubber, such as rear crankshaft oil seals, front and rear transmission oil seals, left and right half-shaft oil seals, front main reducer oil seals, and compressor crankshaft oil seals.

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