German MERKEL seals MERKEL models MERKEL prices

MERKEL seals are the customary term for general seals, simply referring to lubricating oil seals. They are mechanical components used to seal grease (oil is the most common liquid in transmission systems, and also refers to general liquids), isolating lubricated parts from output parts in transmission components to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber; generally, when people refer to oil seals, they often mean this type of tc skeleton oil seal.

Advantages of MERKEL seals

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 skeleton oil seals only require processes such as stamping, bonding, inlaying, and molding to combine metal and rubber into the required oil seal. 2) Oil seals are lightweight and consume little 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 positions 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.

Precautions for MERKEL seals

1) Preparation and precautions before startup: a Comprehensively check whether the mechanical seal, auxiliary devices, and pipeline installations are complete and comply with technical requirements. b Perform a static pressure test before starting the mechanical seal to check for leakage. If there is significant leakage, identify the cause and eliminate it. If ineffective, disassemble, inspect, and reinstall. Generally, the static test pressure is 2~3 kg/cm². c Rotate the pump according to its 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. For media that solidify, use steam to heat the seal chamber to melt the medium. Manual rotation must be performed 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 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 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 During pump operation, avoid cavitation to prevent dry friction on the sealing surface and seal damage. d 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/min), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

Precautions for MERKEL seals

1) Collect a fixed quantity of oil seals. 2) From receipt to assembly, keep oil seals clean. 3) Before assembly, inspect the oil seal. Measure whether the dimensions 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 to ensure they 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 are correct, especially the internal chamfer, which must not have a slope. The end faces of the shaft and housing must be smooth, with no damage or burrs on the chamfers. Clean the assembly area. There must be no burrs, sand, iron filings, or other debris at the shaft insertion point (chamfer), as these can cause irregular damage to the oil seal lip. It is recommended to use an r angle for the chamfer. 5) In terms of operational technique, use your hand to feel if 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 interference fit. Assemble as soon as possible. If the oil seal seat with the installed seal is not mounted immediately, cover it with a cloth to prevent foreign matter from adhering to the seal. Hands or tools applying lithium 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 the skeleton oil seal is installed for tracking purposes, and pay close attention to the entire process.

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