Anti-lock vehicle brake systems

摘要

An anti-lock solenoid valve mechanism which includes a fluid pressure differential member for controlling the flow rate of fluid through the mechanism when the latter is energised. This member is displaced against the armature by the pressure differential across it due to fluid flow past it and displaces the armature against the solenoid magnetic force towards its closed position to reduce fluid flow until a state of equilibrium exists in which the armature is held by the resultant forces in a position in which it has to undergo only minimal displacement to close the solenoid valve on de-energisation.