Pressure control valve system for hydraulic brake device

摘要

The system includes a normally open inlet valve (23), which is mounted in a housing chamber in a main brake line (12) between a main brake cylinder (10) and one or more wheel cylinders (11). A change-over valve (24) has a wide channel and a throttle channel mounted in the housing chamber in the main brake line between the main brake cylinder and the inlet valve. During normal operation the change-over valve directs brake fluid through the wide channel. During brake pressure control, the change-over valve switches over with a pressure difference between the main brake cylinder side and the wheel cylinder side to direct the brake fluid through the throttle channel.