Gate Valve has rising stem and non-rising stem types with solid wedge and flexible wedge for different mediums. Rising stem gate valves are used when shut off is required and a quick visual indicator of open/closed position is needed. The stem of rising stem gate valve drives the gate to lift and lower together, and the transmission thread on the valve stem is outside the valve body. Therefore, the position of the gate can be intuitively judged according to the moving direction and position of valve stem, and the transmission thread is lubricated and protected from fluids, but it requires a large installation space.The Wedge of gate valve include Solid taper wedege,flexible wedge,slpid wedge,parallel disk.The body bonnet joint type include Screwed Bonnet,Bolted Bonnet,Welded Bonnet,Pressure-Seal Bonnet.The gate valve end connection include flange end(RF,FF,RTJ),Butt-weld end and socket weld end.