In addition, some power seats have a lumbar adjustment that USES a small air pump to inflate a bag or bags on the lower back of the seat to serve as a pillow.
Adopting piston pump with fixed stroke, the piston directly propels the diaphragm, thus deleting the complex mechanic stroke adjustment equipment.
采用固定冲程的柱塞泵，省去复杂的机械冲程调节装置，使柱塞直接推动膜片工作。
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The installation of pump could affect the running and service life of pump. Therefore, it is necessary to be careful during installation and adjustment.