LINEAR ACTUATOR WITH A PISTON BYPASS IN A PREDETERMINED PISTON POSITION

摘要

A position dependent valve device (10) for a control cylinder (12) includes at least one channel (24) formed in one of a wall of a cylinder housing (14) of the control cylinder (12) and a wall of a internal piston (20) disposed in the cylinder housing (14) and a seal (26) including a flexible member adapted to be disposed in a groove in the other one of the wall of the cylinder housing (14) and the wall of the piston (20), the seal (26) cooperating with the at least one channel (24) when the piston (20) is in a defined position to allow airflow past the piston (20) and cooperating with one of the cylinder housing (14) and the piston (20) when the piston (20) is in a position outside the defined position to prevent airflow past the piston (20).