Welded connection plate valve with floating seat, two-way open and close, reliable sealing, flexible opening and closing. The lower gate has opened a diversion hole and give precise guidance, while both spray carbide seal, resistance to erosion. Good sealing performance, at full pressure when opening and closing operation torque is small, easy maintenance, long service life, imported welded connection plate valve is widely used in natural gas, petroleum and petroleum products, chemicals, environmental protection, pipelines, venting systems, and oil, gas storage device is used as hoisting equipment.