Page 252 - Valve Selection Handbook
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Rupture  Discs                     239

          Figure 6-23.  Two-Way Rupture Disc
          Incorporating Reverse-Acting Teflon®  Disc
          with Knife Blades. (Courtesy of Continental
          Disc Corporation.)








































            The two-way rupture disc  shown in Figure 6-23  consists basically of a
          perforated  forward-acting  rupture  disc  that  is  sealed  by  a  Teflon®
          reverse-acting  disc,  followed  by  a  girdle  supporting  the  disc  and  knife
          blades. Under conditions of subnormal pressure,  the Teflon® disc will be
          forced  against the knife blades  and be cut. Under conditions  of  excessive
          overpressure,  the perforated  disc and the supporting Teflon® disc  will be
          put in tension and rupture.

          Graphite Rupture   Discs

            Graphite  is a valuable material  from  which low-pressure rupture discs
          can be produced.
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