• The rotating water valve results in a highly selective product. The principle of the rotating water valve is that water is added to the hutch only on the upstroke of the diaphragm. Thus, the jig bed is subjected to upward pulsations only.
• Therefore, gravity separation is effected by the hindered settling principle where the “suction” effect on the material in the feed compartment is diminished resulting in a more selective higher grade hutch product.
• Rotating water valve also reduces water requirement and thereby dilution. This is important from a water consumption standpoint and from a dilution standpoint in applications where the unit is installed in a closed circuit grinding classification circuit.

1. Dilution control: variation in the amount of water added through the rotating valve is an important control of the volume of hutch product.

2. Diaphragm Stroke: Simple adjustment of the eccentric determines the length of the diaphragm stroke and thereby the degree of upward pulsation in the jig bed area.

3. Screens: Lower bedding screen is a tapered wedge bar of stainless steel to prevent rust. Screen opening determines the size of bedding and limits the size of material passing through the hutch.

4. Bedding material: Size, nature, quantity and depth of artificial bedding material determines size and number of particles that can be passed through as hutch product.

5. Speed: Varying the jig speed changes the frequency of pulsation in the bedding area and thereby the rate at which the material can settle.