German sahlberg seals sahlberg models sahlberg prices

sahlberg seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearing of compressors or other fluid handling equipment. They are also sealing devices designed to prevent leakage at the pump shaft and housing. Common types of shaft seals include packing seals, mechanical seals, and dynamic seals. The shaft seal for reciprocating pumps is typically a packing seal. Diaphragm reciprocating pumps can be used when transporting media where leakage is not permitted. The shaft seals for rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and dynamic seals.

sahlberg 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 during startup because the seals have been pre-tested; 4) During installation, simply fit and tighten the seal cover bolts, making it easy to ensure assembly quality; 5) Protects the sealing surfaces 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) Seals can be easily removed for cleaning and inspection without disassembling the pump equipment. The API682 standard recommends cartridge mechanical seals for all mechanical seals.

sahlberg seal startup preparation

1) 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. 2) Perform a static pressure test on the mechanical seal before startup to check for leaks. If there is significant leakage, identify the cause and eliminate it. If ineffective, dismantle, inspect, and reinstall. The general static test pressure is 2~3 kg/cm². 3) Rotate the pump according to its direction to check if it moves smoothly and evenly. If rotation is difficult or stuck, check for incorrect assembly dimensions or improper installation.

sahlberg seal installation precautions

1) Pay close attention during installation to avoid installation deviations. Tighten the gland after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the gland face. 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 sleeve. It should be uniform around the circumference. Use a feeler gauge to check each point; the allowable error should not exceed 0.01 mm. 2) Compress the spring according to specifications. 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 rotating ring, it should automatically spring back when pressed against the spring. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. Before installing the mechanical seal on the machine, carefully compare it with the general assembly drawing to confirm that all parts are ready. Pay attention to any abnormalities such as scratches or defects on the sealing faces of the friction pair and sealing rings. Also check for scratches on the shaft or sleeve surfaces, flanges, and other components in contact with packing and sealing rings (O rings). If any abnormalities are found, replace or repair them before use. During actual installation, do not bring more parts than necessary to the site. If there are leftover parts after installation, it indicates missing installations. If parts are insufficient, it means unnecessary parts were assembled, serving as a self-check during installation.

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