German Alfa laval seals, Alfa laval models, Alfa laval prices

Alfa laval seals utilize the "container" concept from transportation to create cartridge seals. The rotating and stationary parts of this seal are pre-assembled into a unit before installation. After passing inspection and pressure testing, the unit is mounted on the shaft within the seal chamber, fixed to the shaft with set screws, the gland bolts are tightened, and the cartridge positioning tabs are removed, allowing the mechanical seal to operate in a parallel face condition and be put into service. This not only simplifies assembly but also ensures assembly quality. Welded metal bellows mechanical seals are all made as cartridge seals, possessing the aforementioned advantages. Cartridge seals are also a type of cartridge mechanical seal. In this seal, the stationary ring, rotating ring, sleeve, gland, and auxiliary seals are all assembled together on a single sleeve before installation, facilitating inspection of assembly quality. Once inspection is passed, simply tighten the seal cover and secure the screws. This pre-assembled, inspected, and tested seal component makes it easy to ensure installation and assembly quality.

Alfa laval seal features

1) No need to measure the seal working length during installation; 2) The shaft can be adjusted at any time; 3) No leakage occurs at startup because the seal has been pre-tested; 4) During installation, only the seal cover bolts need to be fitted and tightened, making it easy to ensure assembly quality; 5) Protects the sealing faces from contamination by debris or damage due to operational errors before installation or startup; 6) Can be readjusted after thermal expansion of the machinery; 7) Self-centering through fit; 8) Easy to remove the seal for cleaning and inspection without disassembling the pump equipment. The API682 standard recommends the use of cartridge mechanical seals for all mechanical seals.

Alfa laval seal startup preparation

1) Thoroughly inspect the mechanical seal, as well as the auxiliary devices and pipeline installations, to ensure they are complete and comply with technical requirements. 2) Perform a static pressure test on the mechanical seal before startup to check for leaks. If significant leakage is observed, identify the cause and take measures to eliminate it. If this is ineffective, disassemble, inspect, and reinstall the seal. The static pressure test pressure is generally 2~3 kg/cm². 3) Rotate the pump manually according to its direction of rotation to check for smooth and uniform movement. If rotation is difficult or stuck, check whether the assembly dimensions are incorrect and whether the installation is reasonable.

Alfa laval seal installation and shutdown

1) Before startup, keep the seal chamber filled with liquid. 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 the soft ring to shatter. 2) For mechanical seals using an external seal oil system, start the seal oil system first. Stop the seal oil system last after shutdown. 3) 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.

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