Pneumatic servo device

摘要

The pneumatic servo device disclosed comprises a housing (1), a movable power piston (3) provided in the housing (1), which piston divides the interior of the housing into a constant pressure chamber (4) and a variable-pressure chamber (5), a valve body (23), which is connected to the power piston (3) and which has a cylindrical part (24), which extends to the outside of the housing (1). The cylindrical part (24) has a bore (25) running axially right through it. A connecting passage (64) is formed in the side wall of the cylindrical part (24), so that the outer end of the connecting passage (64) is connected to a compressed air source (11). A holder (66A) is inserted into the bore of the cylindrical part (24) so that the interior of the bore is divided into a front space (S) and a rear space (T). The holder (66A) has a holder passage, which connects the connecting passage to a compressed air passage (62) in the plunger, which is in turn displaceably supported in the holder. For the selective adjustment of the connection between the constant pressure chamber (4) and the variable-pressure chamber (5), the compressed air passage (62) and the atmospheric pressure passage, a control valve device (72, 79) is provided so that either atmospheric pressure or compressed air can be fed to the variable-pressure chamber (5), that is for the movement of the plunger (44) ... Original abstract incomplete. <IMAGE>