Abstract: Apparatus for volumetrically feeding dry flowable bulk material. The apparatus comprises a hopper that receives dry flowable bulk material from a storage tank of dry flowable bulk material through a rotary valve located at the top of the hopper. At the bottom of the hopper is a sliding discharge gate for the discharge of dry flowable bulk material from the hopper. Mounted on the hopper in vertically spaced relation is a high level sensor and a lower level sensor. When the height of the dry flowable bulk material in the hopper is above a predetermined height, the high level sensor is activated for the closing of the rotary valve and the opening of the discharge gate. When the height of the dry flowable bulk material in the hopper is below a predetermined height, the low level sensor closes the discharge gate and opens the rotary valve. Thus, the bulk material level in the hopper is maintained within prescribed limits to control the pressure head of the bulk material for improved feed accuracy.