SKF imported bearing seal tests typically assess the assembly and operational reliability of the cylinder’s sealing areas and connections after assembly, such as the seals and connections at the cylinder ports, as well as the dynamic and static seals and their condition on the cylinder piston...
SKF imported bearing seal tests typically assess the assembly and operational reliability of the cylinder’s sealing areas and connections after assembly, such as the seals and connections at the cylinder ports, as well as the dynamic and static seals and their condition on the cylinder piston (between the rod side and non-rod side). As the test pressures are extremely high—particularly for pressure testing of the rodless chamber—it is absolutely impermissible to rely solely on the cylinder port connections to withstand the immense pressure generated by the rodless chamber test and transmitted through the piston to the piston rod. Therefore, such pressure tests are typically conducted during the final assembly and commissioning phase, following meticulous cylinder assembly.
The frame of the machine to which the cylinder belongs is used to bear the immense pressure. If the cylinder assembly is flawless, the cylinder will perform smoothly during the final assembly pressure test. This eliminates the need for specialised jigs for separate pressure testing after assembly, saves the corresponding labour hours, and shortens the production cycle, which is beneficial to production; If, however, there are issues with the cylinder assembly, these will become apparent during the final assembly and commissioning. The cylinder would then need to be removed, dismantled and reassembled, which would be time-consuming, labour-intensive and detrimental to production progress, making it a case of ‘more harm than good’. This is often the result of operators failing to carry out thorough inspections and work with due diligence.
Therefore, prior to assembling SKF imported bearings, one must carefully verify whether the dimensional accuracy of the relevant components conforms to the drawings. Failure of sealing components is often caused by dimensional deviations in the sealing grooves or surface roughness of the sealing surfaces failing to meet requirements. Furthermore, the geometric shape of the seals must be carefully inspected, with particular attention paid to the sealing lips; seals with defects such as irregular shapes, material defects or micro-cracks must not be installed in the product.
Furthermore, the material, hardness and other specifications of the SKF imported bearing seals must be cross-checked against the product certificate of conformity and dispatch note. For example, O-rings have four pressure ratings ranging from 1-1 to 1-4, with corresponding load-bearing capacities varying from low to high. Particularly for those without experience, it is often difficult to distinguish between O-rings of the same specification based on appearance alone. If a low-pressure seal is inadvertently fitted to a high-pressure application, assuming that the assembly process will not encounter issues, the seal is highly susceptible to failure during testing or operation, resulting in seal failure or a significantly shortened service life. The resulting impact and losses are self-evident.
