Pneumatic controller for door of bus, has 3/2 way valves standing on opening in resting position for connecting of cylinder chambers with pneumatic source, and switchable into another position with help of control pressure

摘要

The controller has a dual effect cylinder (12) connected with a vehicle i.e. bus, door, and including cylinder chambers (18, 20) connected with a pneumatic source (10) over valves (22, 24), which are designed as 3/2 way valves. The valves stand on an opening in a resting position (1) for connecting of the cylinder chambers with the pneumatic source. The valves are switchable into another position (2) with the help of control pressure. The valves are elastically prestressed in the resting position, and are connected upstream of pressure-limiting valves (44, 46).