Gate structure is introduced the structure of gate valve gate valve is mainly composed of Industrial Valves body, valve cover, or stent, the valve stem, stem nut, disc, seat, packing box, packing, packing gland and transmission device, FIG. 2 1 is a typical flange connecting rod elastic single ram wedge gate valves. For large diameter or high pressure gate valve, in order to reduce the open-close torque, can be in the import and export pipeline valve adjacent parallel by-pass valve ( Globe valve) , when using, first open the bypass valve, reduce the pressure difference on both sides of the gate, and open gate valve. Bypass valve nominal diameter not less than DN32. Body is the body of the valve, and a pipe or ( Equipment) Direct connection, medium circulation flow pressure parts, is to install the cover, put the seat, connecting pipe of the important parts. Body to accommodate vertical lifting movement of the disc and do disc, valve body cavity height is larger. Body section mainly depends on the shape of nominal pressure, such as low pressure gate valve can be designed as flat, to shrink the structure length; High pressure valve body lumen designed oval more gradual round or circular, in order to improve the bearing capacity and reduce the wall thickness. Body media channels are mostly circular cross section, for larger size gate valve, in order to reduce the size of the ram, opening and closing force and moment, also can be used in the form of reducing, using after reducing, increases the fluid resistance in the valve, pressure drop and increase energy consumption, thus the channel shrinkage than shoulds not be too big, usually seat channel diameter and nominal diameter ratio of 0. 8 to 0. 95, reducing channel bus to the center line of the dip Angle is not more than 12 & deg;

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