Gate valve is an opening and closing part of the gate, the direction of movement of the gate plate is perpendicular to the direction of the fluid, the gate valve can only be fully opened and closed, can not be adjusted and throttled. The gate valve is sealed through the contact between the valve seat and the gate plate, and usually the sealing surface will be surfacing metal materials to increase wear resistance, such as overlay welding 1Cr13, STL6, stainless steel, etc. Get more details of gate valve price on HY Valve.