Duct for car air conditioning systems is fitted with valve whose flap consists of fixed upper section and sliding lower section biased away from upper section by spring, so that it adjusts to varying width of duct

摘要

The duct for car air conditioning systems is fitted with a valve whose flap consists of a fixed upper section (12) attached to the pivot (9) and a sliding lower section (13) This is biased away from the upper section by a spring, so that it adjusts to the width of the duct at different points along the path of the valve.