German eichler seals eichler models eichler prices

eichler seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the rotation axis maintaining contact and sliding relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly the following four types of components: a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seat and keys or fixing screws.

eichler seal classification

1) Packing seal: The packing seal features a simple structure, low cost, and easy maintenance. However, it has high leakage volume 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 (8 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 time, the shutdown sealing device provides the sealing function. Shutdown sealing devices paired with back-vane (or auxiliary impeller) seals often use packing seals. Packing seals come in two types: standard type and mechanically adjustable 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 packing seals use counterweights to loosen the packing during pump operation and tighten it when the pump stops. 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 ore pulp pumps in the phosphate industry. The disadvantages are higher 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 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, 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.

eichler 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) Regularly check the sealing condition. During operation, if leakage exceeds the standard (not more than 5 drops/min for heavy oil, not 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.

eichler seal installation precautions

1) Pay close attention to avoiding installation deviations during installation. Tighten the gland after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the gland end face. Check all points with a feeler gauge; the error should not exceed 0.05 mm. Check the fit clearance (i.e., concentricity) between the gland and the outer diameter of the shaft or shaft sleeve; it should be uniform around the circumference. Check all points with a feeler gauge; the allowable error should not exceed 0.01 mm. 2) Compress the spring according to regulations; excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases the specific pressure on the end face, accelerating wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the rotating ring, press it against the spring; it should automatically spring back. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. Before installing the mechanical seal on the machine, carefully compare it with the general assembly drawing to confirm that all parts are ready. Pay attention to any abnormalities such as scratches or defects on the sealing faces of the friction pair and O-rings. Also check for scratches on the shaft or shaft sleeve surfaces and flanges that contact the packing and O-rings (O rings). If any abnormalities are found, replace or repair before use. During actual installation, do not bring unnecessary parts to the site. If there are leftover parts after installation, it indicates missing components; if parts are insufficient, it means unnecessary parts were assembled, thus serving as a self-check during installation.

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