In order to achieve a good effect of mass ejection, steel shot blasting device must form a complete set of ideal flow control valve, to ensure enough shot blasting device. Through the steel shot flow control valve to regulate the amount of shot blasting machine. Shot blasting machine should be taken into consideration when adjusting motor can withstand the maximum current value. Adjust the volume of blast, rotating steel shot flow control valve adjusting screw can be adjusted according to the actual requirements of blasting. Maximum current must with shot blasting machine motor regulation through the flow of electricity. Work current value should be 90% of the maximum current value, adjust the volume of blast through the ammeter. Throw the head the greater the current, the bigger the quantity of blasting.