Gate valve is widely used in the pipeline through water, mainly used to cut off the flow. According to the structure, it can be divided into open and dark gate valves. According to the sealing cover can be divided into hard seal gate valve and flexible soft seal gate valve; There are flange gate valves, welding gate valves and so on.The specific type of valve should be selected according to its working condition. There are many types of gate valves, but they work in the same way.
Gate valves can only be fully open or closed and cannot be used as flow control valves.It works by moving the disc up and down in a straight line with the stem. The stem has a trapezoid thread and moves up and down through the nuts on the top of the valve and the guide slots on the body. The movement direction of the valve plate is perpendicular to the flow direction of the pipeline fluid medium.
The full open state of a gate valve is not viewable at run time, especially for a non-rising stem gate valve. The open status of the outside gate valve can be judged by observing the exposed position of the stem. Gate valves can be self-sealing or forced sealing after closing. Self-sealing means sealing the sealing surface by medium pressure. However, most gate valves still use forced sealing. Gate valves generally have better sealing performance than butterfly valves.