German ELBI seals ELBI models ELBI prices

ELBI seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearing of compressors or other fluid transport equipment. They are also sealing devices installed to prevent leakage at the pump shaft and housing. Common shaft seal types include packing seals, mechanical seals, and dynamic 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 dynamic seals.

ELBI seal classification

1) Packing seal: The packing seal features a simple structure, low cost, and easy maintenance. 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 for media with various viscosities, strong corrosiveness, and solid particles. The American Petroleum Institute standard API610 (8rd edition) stipulates that cartridge mechanical seals shall be equipped 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 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 stationary sealing device provides the sealing function. Packing seals are commonly used in the stationary sealing devices paired with back-vane (or auxiliary impeller) seals. There are two types of packing seals: standard type and mechanically adjustable tension type. Standard packing seals are similar to those in general packing seal pumps, requiring a slight positive pressure at the shaft seal to avoid dry friction of the packing. Mechanically adjustable tension 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 a high content of 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 a shorter service life for the stationary 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 infiltrating along the shaft. For centrifugal pumps, the shaft seal is a type of dynamic seal. Depending on whether the sealing surfaces are in contact, dynamic seals can be classified as contact dynamic seals and non-contact dynamic seals. In contact dynamic seals, the sealing device is in contact with the shaft, resulting in relative friction between the two. Contact dynamic seals include packing seals and mechanical seals.

ELBI seal operation

1) If slight leakage occurs after the pump starts, observe 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) 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.

ELBI seal precautions

1) Before designing grooves, carefully read the product descriptions for each series to determine whether the product uses an integral groove or a split groove. During seal installation, avoid sharp edges. Installing rod seals into integral grooves requires installation tools. Designers must consider parameters such as groove dimensional accuracy, surface roughness, and extrusion gap. Refer to the product instructions, diagrams, and dimension tables for details. 2) Before installing the seal, ensure there are no impurities or cracks in the sealing groove. Apply operating oil to both the sealing groove and the seal surface. Install the seal gradually in sequence. Avoid sharp edges during installation, align the seal properly, and avoid twisting or tilting. If using a split groove, tighten the pressure cover last.

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