Office Chair Only Descends
The fact that an office chair can only descend may be caused by the aging of the air pressure rod, poor sealing, or the failure of the throttle valve seal ring, and targeted measures need to be taken according to the specific cause.
Aging or Poor Sealing of the Air Pressure Rod
The air pressure rod is the core component of the office chair's lifting system, filled with high-pressure nitrogen and lubricating oil inside. If the seal ring ages or wears out, it will lead to nitrogen leakage or a decrease in the oil-sealing effect, making the air pressure rod unable to maintain the locking pressure and resulting in "slow sinking" or "weak rebound". At this time, the following self-inspection methods can be used:
- Listen for sounds: Check if there is a "hissing" air leakage sound or metal friction noise during lifting or sitting quietly;
- Observe the sinking mode: Slow and continuous sinking usually indicates air leakage in the air pressure rod, while sudden dropping may suggest severe damage to the internal structure;
- Check the connections: Confirm whether the connections between the air pressure rod and the five-star base, as well as the chair surface chassis, are loose.
Failure of the Throttle Valve Seal Ring
If the chair "sinks when sitting down and rises when standing up" and cannot be adjusted in height, it may be due to the aging or wear of the throttle valve seal ring connected to the adjustment lever, causing air leakage in the cylinder. In this case, a seal ring of the same specification needs to be replaced.
Solutions
- Contact the official after-sales service: If the chair is within the warranty period, you can contact the brand's customer service with the purchaseๅญ่ฏ to enjoy free repair or replacement of the air pressure rod service; if the warranty has expired, you can inquire about paid repair or purchase original parts.
- Replace the air pressure rod by yourself: If the chair is out of warranty and the official repair cost is too high, you can purchase a matching air pressure rod for overall replacement. During operation, strictly follow safety regulations, and it is strictly prohibited to disassemble the faulty air pressure rod by yourself (there is a risk of explosion due to the internal high-pressure state).
- Adjust the seal ring or connections: If the seal ring is damaged, you can turn the chair over, adjust it, and replace the seal ring, and tighten the connections; if it is still ineffective after replacement, you need to replace the chair or contact a professional for repair.
Operation Tips
- When conducting self-repair, wear protective equipment to avoid injury caused by the accidental release of energy from high-pressure components;
- During daily use, regularly check the tightness of screws and replace worn parts in a timely manner to prevent similar problems.
