The flat gate valve adopts two structural types of single gate with diversion hole and without diversion hole. The structure with diversion hole has a smooth flow channel, which is suitable for oil and gas transportation.

Knife gate valve is also called knife gate valve, knife type slurry valve, its opening and closing part is gate, the movement direction of gate is perpendicular to the direction of fluid, and the medium is cut off by blade-shaped gate that can cut fiber material. Two sealing surfaces, the two sealing surfaces of the commonly used mode gate valve form a wedge shape, and the wedge angle varies with the valve parameters, usually 50. The gate of the wedge type knife gate valve can be made into a whole, which is called a rigid gate; It can also be made into a gate that can produce a small amount of deformation to improve its manufacturability and make up for the deviation of the angle of the sealing surface during processing. This gate is called an elastic gate. There is actually no chamber in the valve body, the gate rises and falls in the side guide groove, and is pressed against the valve seat by the lugs at the bottom. If a higher medium sealing performance is required, an O-ring sealing valve seat can be used to achieve Two-way sealing.