Gate valve (gate valve) is a opening and closing parts of the gate plate, the direction of movement of the gate plate and the direction of the fluid is vertical, the gate valve can only be fully open and fully closed, the discomfort of the door parameters vary, usually 5°, medium temperature is not high, 2°52'. Improve its technology, make up for the sealing surface Angle in the process of the deviation, this kind of gate is called elastic gate.