German COG seals COG models COG prices

COG 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 of a reciprocating pump is typically a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals for rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and dynamic seals.

Features of COG seals

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, only the seal cover bolts need to be fitted and tightened, 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 cooperation; 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.

Preparation for starting COG seals

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 leakage. If there is significant leakage, identify the cause and eliminate it. If ineffective, disassemble, inspect, and reinstall. Generally, the static pressure test pressure is 2~3 kg/cm². 3) Rotate the pump according to its direction of rotation to check if it moves smoothly and evenly. If rotation is difficult or stuck, check for incorrect assembly dimensions or unreasonable installation.

Causes of COG seal failures

Mechanical seal failures are generally identified only after phenomena such as abnormal leakage, abnormal wear, or abnormal torque occur. The causes of failure can be broadly categorized into four aspects: 1) Incorrect design or selection of the mechanical seal; 2) Poor quality of the mechanical seal; 3) The precision of the machine using or installing the mechanical seal does not meet requirements; 4) Incorrect operation of the machine.

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