Valve Under Office Chair

The valve under an office chair usually comes in the form of a knob or adjustment lever, and its main function is to control the height adjustment of the seat or the hardness of the backrest. Its specific functions and operating methods need to be differentiated based on the type of chair and its design features:

Function and Operation of the Valve on Pneumatic Lift Chairs

The valve at the bottom of a pneumatic lift chair is typically a knob or adjustment lever, and its core function is to control the internal mechanical structure of the pneumatic rod. When a user needs to adjust the height of the seat surface, turning the valve clockwise will lower the seat surface height, while turning it counterclockwise will raise it. This process is achieved through the piston movement inside the pneumatic rod: when the valve is turned, the internal mechanical locking device releases or locks the gas pressure inside the pneumatic rod, thereby changing the distance between the seat surface and the ground. For example, if a user feels that the seat surface is too low after sitting down, they can raise the seat surface to a comfortable height by turning the valve counterclockwise; conversely, if the seat surface is too high, turning the valve clockwise will lower it.

Function and Operation of the Backrest Hardness Adjustment Valve

Some office chairs have valves at the bottom that can also adjust the hardness of the backrest. These valves typically adjust the hardness by changing the tension of the backrest support structure. Turning the valve clockwise will make the backrest harder, at which point the backrest provides stronger support to the user's back, suitable for scenarios where a proper sitting posture needs to be maintained for a long time; turning the valve counterclockwise will make the backrest softer, and the backrest will deform more significantly in response to the user's back movements, providing softer support, suitable for resting or relaxing. For example, when focusing on work, users can turn the valve clockwise to make the backrest harder to reduce body movement; during lunch breaks, they can turn the valve counterclockwise to make the backrest fit the body's curves better.

Scientific Basis for Valve Design

The design of the valves is based on ergonomic principles, aiming to meet users' diverse needs for seat functions through simple operations. The height adjustment valve ensures that the seat surface remains stably at the target height after adjustment through the mechanical locking mechanism of the pneumatic rod; the backrest hardness adjustment valve balances support and comfort by changing the tension of the support structure. The combination of these two functions enables office chairs to adapt to users of different heights, body types, and usage scenarios.