German Watson-Marlow seals Watson-Marlow models Watson-Marlow prices

Watson-Marlow seals are typical representatives of oil seals; generally, the term "oil seal" refers to skeleton oil seals. The function of an oil seal is typically to isolate components requiring lubrication within 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. Based on 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. Based on skeleton type, they can be divided into internally enclosed skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. Based on 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.

Watson-Marlow 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 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 components, 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.

Watson-Marlow seal precautions

1) Preparation and precautions before startup: a Comprehensively check whether the mechanical seal, as well as 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 still ineffective, disassemble, inspect, and reinstall. Generally, the static pressure test pressure is 2~3 kg/cm². c Rotate the pump according to its direction of rotation to check if it is light and uniform. If rotation is difficult or stuck, check whether 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. Manual rotation must be performed before startup to prevent sudden startup from causing the soft ring to shatter. b For mechanical seals utilizing 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 continuous operation for 4 hours does not reduce the leakage, 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 of the sealing surfaces 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 trend within 2-3 days, stop the pump to inspect the sealing device.

Watson-Marlow seal installation precautions

1) Pay close attention during installation to avoid installation deviations. Tighten the gland after coupling alignment. Bolts should be tightened evenly to prevent gland face skewness. Check each point 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 each point with a feeler gauge; the allowable error should not exceed 0.01 mm. 2) Spring compression amount must be performed 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 moving ring, pressing it against the spring should allow it to automatically spring back. 4) Installation position requirements: To ensure stable operation, long life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. When installing the mechanical seal on the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this time, pay attention to any abnormalities such as scratches or defects on the sealing faces of the friction pair, sealing rings, etc. Also check for scratches on the shaft or shaft sleeve surfaces, flanges, and other components in contact with packing and sealing rings (O rings). If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts than needed to the site. If parts remain after installation, it indicates missing installations; if parts are insufficient, it means parts were assembled in unnecessary places, thus serving as a self-check during installation.

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