German HANDTE seals HANDTE models HANDTE prices

HANDTE seals can be divided into two major categories: static seals and dynamic seals. Static seals mainly include three types: gasket seals, sealant seals, and direct contact seals. According to the working pressure, static seals can be further divided into medium- and low-pressure static seals and high-pressure static seals. Medium- and low-pressure static seals commonly use gasket seals made of softer materials with wider widths, while high-pressure static seals use metal gaskets made of harder materials with very narrow contact widths. Dynamic seals can be divided into two basic types: rotary seals and reciprocating seals. Additionally, depending on whether the seal contacts the components moving relative to it, they can be classified as contact seals and non-contact seals; based on the seal and the contact position, they can be divided into circumferential seals and face seals, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic seals achieve sealing by imparting power to the medium during machine operation, hence they are sometimes referred to as power seals.

HANDTE seal advantages

1) Oil seals have a simple structure and are easy to manufacture. Simple oil seals can be molded in one step; even the most complex oil seals do not have complicated manufacturing processes. Metal-cased oil seals only require stamping, bonding, inlaying, and molding processes to combine metal and rubber into the required oil seal. 2) Oil seals are lightweight and consume less material. Each oil seal is a combination of thin-walled metal and rubber parts, consuming very little material, so each oil seal is very light. 3) Oil seals have small installation spaces and small axial dimensions, are easy to process, and make machines compact. 4) Oil seals have good sealing performance and long service life. They have certain adaptability to machine vibration and spindle eccentricity. 5) Oil seals are easy to disassemble and convenient to inspect. 6) Oil seals are inexpensive.

HANDTE seal precautions

1) Preparation and precautions before startup: a, comprehensively check whether the mechanical seal, auxiliary devices, and pipeline installations are complete and meet technical requirements. b, perform a static pressure test on the mechanical seal before startup to check for leakage. If there is significant leakage, identify the cause and eliminate it. If still ineffective, disassemble, inspect, and reinstall. Generally, the static pressure test pressure is 2~3 kg/cm². c, rotate the pump according to its rotation direction to check if it is light and uniform. If rotation is difficult or stuck, check if assembly dimensions are incorrect or installation is unreasonable. 2) Installation and shutdown: a, keep the seal chamber filled with liquid before startup. When transporting solidifying media, use steam to heat the seal chamber to melt the medium. Must rotate the pump before startup to prevent sudden startup from causing soft ring fracture. b, for mechanical seals using an external seal oil system, start the seal oil system first. Stop the seal oil system last after shutdown. c, do not immediately stop the cooling water for the seal oil chamber and face seal after stopping a hot oil pump; wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging seal parts. 3) Operation: a, if slight leakage occurs after pump startup, observe for a period. If leakage does not decrease after continuous operation for 4 hours, stop the pump for inspection. b, pump operating pressure should be stable, with pressure fluctuations not exceeding 1 kg/cm². c, avoid cavitation during pump operation to prevent dry friction on the sealing surface and seal damage. d, frequently 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/min), and if there is no improvement trend within 2-3 days, stop the pump to inspect the sealing device.

HANDTE seal precautions

1) Collect a fixed quantity of oil seals. 2) From receipt to assembly, oil seals must be kept clean. 3) Before assembly, inspect the oil seal, measure whether the dimensions of all parts of the skeleton oil seal match the shaft and housing dimensions. Before installing the skeleton oil seal, clearly compare the shaft diameter with the inner diameter of the oil seal; they must match. The internal dimensions of the housing must suit the outer diameter width of the oil seal. Check if the lip of the skeleton oil seal is damaged or deformed, and if the spring has fallen off or rusted. Prevent the oil seal from being placed flat during transport, subjected to external squeezing and impact, which could destroy its roundness. 4) Perform machining inspection procedures before assembly, measure whether the dimensions of the housing and shaft parts are correct, especially the internal chamfer, which must not have a slope. The end faces of the shaft and housing must be machined smoothly, with no damage or burrs on the chamfers. Clean the assembly area; there must be no burrs, sand, iron chips, or other debris at the shaft insertion area (chamfer), as these can cause irregular damage to the oil seal lip. It is recommended to use a r angle for the chamfer area. 5) In terms of operational technique, you can feel with your hand whether it is smooth and truly round. 6) Do not tear open the packaging paper of the skeleton oil seal too early before installation to prevent debris from adhering to the seal surface and entering into operation. 7) Before mounting, apply an appropriate amount of lithium-based grease containing molybdenum disulfide between the lips of the skeleton oil seal to prevent dry grinding of the lip during instantaneous shaft startup, which affects the lip's interference fit, and assemble as soon as possible. If the oil seal seat with the installed seal is not mounted immediately, it is recommended to cover it with a cloth to prevent foreign matter from adhering to the seal. Hands or tools applying lithium-based grease must be clean. 8) Skeleton oil seals must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. Pressure should not be too high, and speed should be uniform and slow. 9) Mark the machine where this skeleton oil seal is installed for tracking purposes, and pay close attention to the entire process.

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