German interseal seals interseal models interseal prices

interseal seals are a typical representative of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

interseal 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 conveying 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 conveying 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 equipped unless otherwise specified by the user. 3) Dynamic seal: Dynamic seals can be divided into two types: 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 stationary sealing device provides the sealing function. Packing seals are commonly used in the stationary sealing devices associated with back-vane (or auxiliary impeller) seals. There are two types of packing seals: 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 conveying 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 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.

interseal seal operation

1) If slight leakage occurs after the pump starts, observe for a period. If continuous operation for 4 hours does not reduce the leakage, 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 of the sealing faces and seal damage. 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.

interseal seal installation precautions

1) Pay close attention to avoiding installation deviations during installation. Tighten the gland cover after coupling alignment. Bolts should be tightened evenly to prevent tilting of the gland cover face. Check each point with a feeler gauge; the error must not exceed 0.05 mm. Check the fit clearance (i.e., concentricity) between the gland cover and the outer diameter of the shaft or shaft sleeve; it must be uniform around the circumference. Check each point with a feeler gauge; the allowable error must 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 face specific pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the rotating ring, it should automatically spring back when pressed against the spring. 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. When installing the mechanical seal on the machine, carefully compare it with the general assembly drawing before installation to confirm that all parts are ready. At this stage, check for abnormalities such as scratches or damage on the sealing faces of the friction pair and sealing rings. Also check for scratches on the shaft or shaft sleeve surfaces contacting the packing and sealing rings (O rings), as well as on flanges and other components. If any abnormalities are found, replace or repair before use. During actual installation, do not bring excess parts to the site. If parts remain after installation, it indicates missing installations; if parts are insufficient, it means unnecessary parts were assembled, thus serving as a self-check during installation.

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