Hermetic sealing is reliable, the filling changes but is in progress under not stopcalculation situation, the convenient rapid block of wood affects systematic operation.
密封可靠，针阀填料更换可在不停机情况下进行，角阀方便快捷不影响系统运行。
2
Some new points of view are also brought in on choosing of propeller design point, setting of fuel stop power and calculation of fuel consumption.