1.The maximum flow of control valve is 1.2 to 1.4 times the rated flow.

2.The control valve flow generally shall be less than 15% of the rated flow.

3.The variation flow of the control valve is less than 5% of the rated flow.

4.The zero stroke of the control valve shall be less than 10% of total stroke.

5.The saturation zone shall occur when the pressure is over 85%.