Middle-position unloading damping circuit of large-flow electro-hydraulic directional control valve

The utility model discloses a middle-position unloading damping circuit of a large-flow electro-hydraulic directional control valve. The middle-position unloading damping circuit is used for a K-type electro-hydraulic directional control valve, so that when middle-position unloading is carried out, damping is reduced. An unloading damping loop is mounted on a hydraulic pipeline between the K-type electro-hydraulic directional control valve and a hydraulic cylinder, and a double-direction overflowing valve and a normally-open type two-position two-way electromagnetic directional valve are connected to a hydraulic pipeline between an opening A of the K-type electro-hydraulic directional control valve and an oil inlet of the hydraulic cylinder. When pressurizing is carried out, hydraulic oil passes through the unloading damping loop in a large-flow mode, the hydraulic cylinder is rapidly pressurized, and when unloading is carried out, the hydraulic oil is divided into two paths on the unloading damping loop in a