Flange check valves can be divided according to its structure and installation 1, check valve flange form, around a channel rotation axis, as the channel into a streamline internal valve, flow to the low flow of large diameter and flow is not frequent change of the resistance is smaller than or butterfly valves, but not for the pulsating flow, sealed performance is lower than the elevator. Butterfly valves have a single point, the double valve class and three most, press valve diameter of three kind of main form, the purpose is to prevent the media to stop flow or back, decrease hydraulic shock. 2, flange check valves: along the vertical center line of valve body, described the internal thread check valves may be installed in a horizontal pipe, can be used in ball valve small high pressure valve. Butterfly shape and globe valves ( Close the valve and the common) , so it is a fluid drag coefficient. Its structure is similar to the cut-off valve, the valve body and valve shutoff valve and the same. The cover of the upper and the lower part of the guide sleeve valve with Jane, Jane movable valve guide and valve guide, Jane, when the medium downstream, thrust by the media to open the valve, when the media stop flow formed by the vertical landing on the seat disc, from the media, in order to prevent backflow effect. Butterfly valves direct medium channel direction importers a vertical direction; Vertical lift check Industrial Valves, valve seat and export pathway in the direction of the media channels in the same direction, than small flow resistance. 3, flange check valves, valve seat on the rotary valve pin. Simple disc check valve structure, can only be installed in horizontal pipe runs, sealed well. 4, flange check valves: along the centerline of slide valve is the valve body. Pipeline valve is a valve, its small size, light weight, good processability, is one of the check valve development direction. But the fluid resistance coefficients slightly bigger than a check valve. 5. Clamp valve: the valve is used as boiler make-up water and steam valve, and it has a lift check valve globe or Angle valves overall performance. In addition, there are - Some does not apply to the pump discharge check valve installation, such as a foot valve, spring type, Y type check valve, etc.
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