The opening and closing part of the threaded gate valve is a plug-shaped disc, the sealing surface is a plane or a conical surface, and the disc moves linearly along the center line of the fluid. The movement form of the valve stem includes a lifting rod type (the valve stem rises and falls, and the handwheel does not rise and fall), and there is also a lifting rotary rod type (the handwheel rotates and lifts together with the valve rod, and the nut is arranged on the valve body). Threaded gate valve is a mandatory sealing valve, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to not leak. When the medium enters the valve body from under the valve disc, the resistance that the operating force needs to overcome is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the valve The diameter of the stem should be large, otherwise the failure of the top of the valve stem will occur.

Applicable medium: oil, water, steam, etc. Gate valve application: chemical, petrochemical, petroleum, papermaking, mining, electric power, liquefied gas, food, pharmaceutical, water supply and drainage, municipal, mechanical equipment, electronic industry, urban construction and other fields.

Gate valve features: (1) Small flow resistance. The medium channel inside the valve body is straight, the medium flows in a straight line, and the flow resistance is small. (2) Compared with the opening and closing of the globe valve, it is more labor-saving: whether it is opened or closed, the movement direction of the gate is perpendicular to the flow direction of the medium. (3) The height is large and the opening and closing time is long. The opening and closing stroke of the gate is large, and the lowering is carried out through the screw. (4) Water hammer phenomenon is not easy to occur. The reason is the long closing time. (5) The medium can flow in any direction on both sides, which is easy to install, and the two sides of the channel are symmetrical. (6) The structural length (the distance between the two connecting end faces of the shell) is small. (7) The shape is simple, the length of the structure is short, the manufacturing process is good, and the scope of application is wide. (8) The structure is compact, the valve is rigid, the channel is smooth, the flow resistance is small, the sealing surface is made of stainless steel and hard alloy, the service life is long, and the PTFE packing is used, the sealing is reliable, and the operation is light and flexible.