Be sure to turn on manual or electric venting before starting the blower valve (to prevent the impact of the starting pressure on the fan), check whether the oil in the oil tank has reached the oil level line (to prevent the oil from burning the gears and bearings), turn the fan by hand to see if it is flexible, if it is flexible, press start again, and then slowly Close the vent valve to allow the fan to reach full load (remember not to overload). When shutting down, be sure to open the blower vent valve first and then press the disconnect button. In this way, normal operation and use can extend the service life of the fan. Otherwise, the fan gear and bearings will be severely impacted or even damaged (Note: If the diameter of the outlet vent valve is too small, it will not meet the unloading requirements. Please make sure that the diameter of the outlet vent valve is the same as or close to the main pipe). It is especially important for high-pressure fans with high pressures above 0.05Mpa! Except with frequency conversion start.