Pre-controlled hydraulic directional valve and core for valve housing of same

The invention relates to a pre-controlled hydraulic direction valve which has a master control slide block that can perform longitudinal movement in the main valve hole of the valve housing. Furthermore two pressure chambers are adjacent to the master control slide block. Furthermore the directional valve has a pre-controlling slide block which can perform longitudinal movement in a pre-controlling valve hole that preferably extends parallelly with the main valve hole, and furthermore pressure are applied to the two pressure chambers in different manners according to positions. A first pre-controlling channel extends between the pre-controlling valve hole and a first pressure chamber in the two pressure chambers, and furthermore a second pre-controlling channel extends between the pre-controlling valve hole and a second pressure chamber in the two pressure chambers. The pre-controlling valve hole is connected with a controlling oil source or a controlling oil trough through the other pre-controlling channel.