Abstract: The WK20 type electric shovel used by sijiaying North District Branch company frequently suffers from failures of the original design pneumatic pressure controller because of the bad working environment,the poor stability of power supply of the equipment and the large vibration in operation The normal operation of equipment production is seriously restricted.In order to reduce the equipment failure rate and spare parts cost,the hardware and power supply mode of gas path pressure control system were improved based on the analysis of working principle of gas path pressure control system.The result of practice shows that the improvement of gas path control system can obviously reduce the equipment failure rate,reduce the maintenance time,increase the equipment operating rate,and save the cost and improve the equipment operating efficiency.

Key words: Shovel,Gas Path,Control, Pressure