German Stuewe seals Stuewe models Stuewe prices

Stuewe seals are devices that prevent fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide 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. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are also used as auxiliary seals; since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

Advantages of Stuewe seals

1) Oil seals have a simple structure and are easy to manufacture. Simple oil seals can be molded in a single step; even for the most complex oil seals, the manufacturing process is not complicated. Metal-cased oil seals require only stamping, bonding, inlaying, and molding processes 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, resulting in minimal material consumption and very light weight per seal. 3) Oil seals require small installation space and have small axial dimensions, making them easy to machine and allowing for compact machine design. 4) Oil seals offer 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 low in price.

Precautions for Stuewe seals

1) Preparation and precautions before startup: a. Conduct a comprehensive inspection of the mechanical seal, as well as auxiliary devices and pipeline installations, to ensure they are complete and meet technical requirements. b. Perform a static pressure test on the mechanical seal before startup to check for leakage. If leakage is significant, identify the cause and take measures to eliminate it. If this is ineffective, disassemble, inspect, and reinstall. The static test pressure is generally 2~3 kg/cm². c. Rotate the pump manually according to its direction of rotation to check if it moves smoothly and evenly. If rotation is difficult or stuck, check whether assembly dimensions are incorrect or installation is improper. 2) Installation and shutdown: a. Keep the seal chamber filled with liquid before startup. When transporting media that solidify, use steam to heat the seal chamber to melt the media. Manual rotation must be performed before startup to prevent sudden startup from causing fracture of the soft ring. 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 components. 3) Operation: a. If slight leakage occurs after pump startup, observe for a period. If the 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 of the sealing faces and seal damage. d. Regularly inspect the sealing condition. During operation, if leakage exceeds the standard (not more than 5 drops/min for heavy oil, not more than 10/min for light oil), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

Technical requirements for Stuewe seal installation

Mechanical seals are high-precision mechanical components, and correct installation and operation significantly impact their service life. We generally follow the standards specified by the Ministry of Petrochemical Industry. The technical requirements for the pump and the mating parts of the mechanical seal are as follows: 1) Shaft bending: maximum not greater than 0.05 mm; 2) Rotor runout: near the shaft sleeve at the rotating ring seal location, not greater than 0.06 mm; 3) Axial shaft movement must not exceed ±0.5 mm; if a shaft sleeve is present, the sleeve must not be loose; 4) Coupling alignment error: for gear couplings, not greater than 0.08–0.10 mm (P2008C); for elastic couplings, not greater than 0.05–0.06 mm; (common practice: axial runout<0.05, radial runout<0.10) 5) The concentricity tolerance of the gland (static ring seat) and the sealing spigot relative to the shaft centerline is 0.05 mm; the perpendicularity tolerance of the surface contacting the gasket relative to the centerline is 0.03–0.05 mm. If these requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the rotating ring seal is installed, and the ends of the gland (or housing) where the static ring seal is installed, should be chamfered and smoothed. 7) Exercise care during installation and removal of mechanical seals; strictly prohibit the use of hammers and flat chisels to avoid damaging seal elements. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, coordinate during assembly and disassembly to avoid neglecting one side while attending to the other. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the rotating and static ring components must be replaced and must not be merely retightened for continued use. Because after loosening, the original operating trajectory of the friction pair changes, easily compromising the sealing integrity of the contact surfaces.

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