How to check whether there is a quality problem with the pressure bar of the pneumatic office chair?

Visual inspection
Check the surface of the pressure rod: carefully observe whether the surface of the pressure rod is smooth, and there are no obvious scratches, dents, cracks or rust. Scratches and dents may weaken the structural strength of the pressure rod, cracks may directly lead to gas leakage, and rust will reduce the material performance of the pressure rod, which are signs of quality problems.
Check the welding parts: the joints between the pressure bar and the seat and the welding points of the pressure bar itself should be checked for firmness, and there are no problems such as virtual welding, missing welding or welding slag. If the welding is not firm, it is easy to loosen and break during use, which leads to safety risks.

Observe the thickness of the pressure rod: under normal circumstances, the quality of the pressure rod tube wall thickness is uniform, and the overall thickness is consistent. If it is found that the pressure rod has local thinning or thickening, it may be a problem in the production process, which will affect its pressure resistance and stability.
Operational check
Height adjustment test: Adjust the height of the office chair repeatedly to feel whether the adjustment process is smooth. If there is a stall, excessive resistance or failure to adjust to the proper height, it may mean that there is a problem with the piston or seal inside the pressure rod, such as wear, aging or damage.
Stability test: Sit in an office chair, gently shake from side to side or tilt your body back and forth, and observe whether the seat is stable. If the seat has obvious shaking, tilting or abnormal noise, it may be that the connection between the pressure bar and the seat is not stable, or the balance and support performance of the pressure bar itself is not good.
Pressure withstand test: under the premise of ensuring safety, the pressure of the seat can be appropriately increased, such as forcing down the armrest or the upper part of the backrest, to observe whether the pressure rod can withstand normal pressure, and whether there is abnormal subsidence or deformation. If the pressure rod has obvious subsidence or does not bounce back in time under normal pressure, it indicates that its pressure bearing capacity may be insufficient.
Other examination
Check the brand and certification: Know the brand of the pressure bar, the well-known brand is usually more guaranteed in the quality and production process. At the same time, check whether the pressure bar has relevant safety certification marks, such as SGS, BIFMA and other certifications, which are a recognition of the quality and safety of the pressure bar. Without the relevant certification, its quality may be at risk.
Reference product information: Check the product manual or label of the office chair to understand the material, specifications, service life and other information of the pressure bar. If the product information is incomplete or ambiguous, it may be a sign of poor product quality. You can also search online for user reviews and feedback on this model of pressure bar to understand whether other users have encountered quality problems.