Parallel Flat Gate Valve with Diversion Hole has the features of good sealing property, small ON/OFF moment, sulfur resisting and wear-proof, long service life and cleaning pipeline by hair bulb, etc. It is designed applicable for pipeline system of non corrodible and corrodible medium such as water, petrol, natural gas, steam, etc, acting as start-stop device, especially applicable for fields of petroleum and chemical industry, oil, gas, long-distance pipelines, etc.