German ardima seals ardima models ardima prices

ardima 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 usually 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.

ardima seal classification

1) Packing seal; packing seals have a simple structure, low price, and are easy to maintain. However, they have 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 require higher standards 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 (8rd edition) stipulates: Unless specified by the user, cartridge mechanical seals should be installed. 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 time, the shutdown sealing device provides the seal. Packing seals are commonly used in 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 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 transporting media with many solid particles, such as slurry pumps and feed slurry pumps in the phosphate industry. The disadvantage is greater power loss compared to mechanical seals, and the service life of the shutdown sealing device is shorter. The seal between the rotating pump shaft and the fixed pump housing 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 type of 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. Contact dynamic seals include packing seals and mechanical seals.

ardima 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 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) Check the sealing condition regularly. 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.

ardima seal installation and shutdown

1) Before starting, ensure the seal chamber is filled with liquid. For media that solidify, use steam to heat the seal chamber to melt the medium. Manual rotation must be performed before starting to prevent sudden startup from breaking the soft ring. 2) For mechanical seals using an external seal oil system, start the seal oil system first. Stop the seal oil system last after shutdown. 3) After stopping a hot oil pump, do not immediately stop the cooling water for the seal oil chamber and face seal. Wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging the seal parts.

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