... journal recipocating to outputting the water.It is widely uesd in mining,oilfields, constructions,metallurgy, paper making,medicine,chemistry ... ,fast and stop.2.Simple in structure,small in volum,light in weight,easy in operation and low in maintenance.3.Stable under inflammable, ... until overload relieved and restart,5.Change air in-let direction in operating valve to get clockwise and anti-clockwise ...