CONTROL VALVE FOR AUTOMATIC COMPRESSED-AIR BRAKES

摘要

The invention relates to a control valve for automatic compressed-air brakes for generating a brake cylinder pressure in at least one connected brake cylinder (4) in accordance with a pressure difference between a pressure in a connected main brake pipe (L) of a train and a stored reference pressure (A), comprising a main part (1), a pipe part (2) and a support (3) having a pipe for the additional venting of air (KZE) leading from the pipe part via the support to the main part, the main part (1) comprising the following parts: a control piston (7) having a piston rod (16), said control piston being subjected, on the one hand, to the reference pressure (A) and, on the other hand, to a control pressure (S) and at least one pressure spring (13), and a compensating piston (8) that is subjected to the pressure (C) of the brake cylinder (4) against the force of at least one pressure spring (20); and a double-seat valve (10), in which an inlet valve (103) opens via a piston rod (16) when the control piston (7) approaches and an outlet valve (101) opens when the piston rod moves away, wherein the inlet valve (103) is located in an air path from an air storage reservoir (5) in the direction of the brake cylinder (4), whereas the outlet valve (101) is located in an air path from the brake cylinder (4) to the surroundings (0), wherein the piston rod (16) comprises a longitudinal bore (27) and at least one transversal bore (28) leading into the latter, wherein the at least one transversal bore (28) is located, separated only by a free space, in the vicinity of a supply (25) of pressure (R) in the housing of the air storage reservoir (5) when the control piston (7) is in the initial position, and wherein the piston rod (16) is surrounded by a sleeve (26) that forms an annular gap to the piston rod (16) below said at least one transversal bore (28) when the piston rod is in the initial position.