the body structure is more excellent in butterfly valve body structure of the wafer body, it can be put in place between two pipe flanges. An important advantage of this structure is, tighten the bolts under the two flanges matching all the tensile stress caused by the pipe tension, and make the wafer body under compression. Internal tensile stress produced by medium pressure makes this compressive stress with ease. The flange body must bear tension produced all the tensile stress of pipeline, internal pipeline pressure generated by the increase of tensile stress. Because of this situation, and most of the metal is under compression load than bear the characteristics of tension load limit twice, so it is recommended to use the wafer body.

as shown in figure 2 - typical seal structure 34.

FIG. 2 34 ( a) Shown in interference seal butterfly valve, butterfly valve on the circumference of a circle with the elastic sealing ring, sealing ring material is usually rubber or fluorine plastic. Figure 2 - 34 ( b) Butterfly plate on the circumference of a circle as shown by sealing tube, blowing through the pressure for blowing tube expansion for seat tightness.

FIG. 2 34 ( c) Shown in interference seal butterfly Industrial Valves, the elastic seal fixed on the disc. Figure 2 - 34 ( d) Shown in interference seal butterfly valve, the elastic seal fixed on the valve body. Figure 2 - 34 ( e) Shown in eccentric structure of butterfly valve seals for multi-layer stainless steel sheet with flexible graphite composite material combination, seal fixed on the disc. Figure 2 - 34 ( f) Shown in eccentric structure of butterfly valve seals for multi-layer stainless steel sheet with flexible graphite composite material combination, seal fixed on the valve body. Figure 2 - 34 ( g） Shown in partial hardness seal butterfly valve, seals for stainless steel elastic ring, usually fixed on the valve body. Figure 2 - 34 ( h) Shown in eccentric with fire protection structure of butterfly valve, seals for elastic structure, when the rubber or fluorine plastic seal, the fire burn down stainless elastic ring sealing function still can have a short time.

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