Gate valve is as globe media, when fully opened, the entire flow through, running at medium pressure losses.
Gate valves are normally applied, does not require constant opening and closing, and kept the gate fully open or fully closed condition. Does not apply to used as regulating, throttling.
For the high-speed flow of media, the gate open in local conditions, can cause valve vibration, and vibration, and may damage the disc and valve seat sealing surface and throttle will cause the erosion of media to the gate.
From the structural form, the main difference is the sealing element of form.
According to seal, often divided into several different valve types, such as:-wedge gate valve, parallel gate valve parallel double gate valve, wedge type gate. Most commonly used forms of wedge gate valve and parallel gate valve.