Straight line walking valve and controlling system achieving excavator straight line walking

The invention provides a straight line walking valve and controlling system achieving excavator straight line walking. The straight line walking valve and controlling system achieving excavator straight line walking comprises a valve body, a plug screw, a straight walking valve rod, a one-way valve, a one-way valve spring, an outer spring, a limiting rod, an inner spring, a blanking cap and a spring seat. The plug screw, the straight walking valve rod, the one-way valve, the one-way valve spring, the outer spring, the limiting rod, the inner spring, the blanking cap and the spring seat are arranged in the valve body. The left end of the straight walking valve rod is positioned through the plug screw. The spring seat is fixed at the right end of the straight walking valve rod. The plug screw is connected with the left end of the valve body in a screw joint mode. The outer spring and the inner spring are coaxially sleeved on the limiting rod. The right end of the outer spring reacts on an inner hole of the blanking cap and the left end of the outer spring reacts on a step at the right end of the spring seat. The right end of the inner spring reacts on the inner hole of the blanking cap and the left end of the inner spring reacts on the right end of the spring seat. An excavator executing mechanism is supplied with oil by part of hydraulic oil of one main pump and the other part of the oil is converged with hydraulic oil of another main pump. The straight line walking valve and a controlling system achieving excavator straight line walking are arranged in a way that oil is supplied by a motor to the left and to the right together. The fact that performance of straight line walking is achieved when the excavator is operated at the same time is achieved.