Relay valve control chamber pressure control method - switching changeovervalve before blocking valve when load circuit pressure rises

摘要

A relay valve (13) control chamber (23) pressure control method involves switching a change-over valve (30) temporarily into its operating position (30b) before a blocking valve (29) is switched into its operating position (29b) in the event of a rise in the pressure in the load circuit. In the event of a limitation of the pressure drop in the load circuit the change-over valve is switched into its rest position (30a) before the blocking valve is switched into its operating position. USE/ADVANTAGE - Prevents excessive operating pressure increase in load circuit, e.g. brake installation of commercial vehicle.