Technical characteristics: 1). Low resistance: Adopt technology of reversing valve (our patent) with high valve opening, low resistance and 0.3~1.1 of resistance coefficient; 2). Small volume: Butterfly type for valve body, its volume is just 1/3~1/5 of multifunction hydraulic valve with similar caliber; 3). Light weight: Its weight is just 1/3~1/5 of multifunction hydraulic valve; 4). Long service life: Adopt sloping seal (our patent) with auto compensating of seal surface (our patent) for prolong service life; 5). Automatic control: Valve is interlocked with pump through pipe medium for linkage which without manual intervention; 6). Energy saving: Driven by medium pressure without external force for energy saving; 7). Good sealing: Adopt double sealing technology with soft & hard material (our patent) which can solve seal problem of large caliber valve for guarantee long period of zero leakage; 8). Easy opening and closing: Large valve board is adopted eccentric structure with low frictional moment; 9). Convenience maintenance: Components of control system are all located outside valve body with features of simple regulation and online maintenance.