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AVAILABLE FOR MAINTENANCE REPLACEMENT ONLY Continental Disc Corporation's ZAP & KBA reverse acting rupture discs (bursting discs) utilize knife blades to open the rupture discs (bursting discs) as reversal occurs. The ZAP & KBA rupture discs (bursting discs) have the media pressure acting on the convex side of the rupture disc (bursting disc), placing it in compression. When the burst pressure rating of the rupture disc (bursting disc) is reached, the compression loading on the rupture disc (bursting disc) causes it to reverse, snapping it through its neutral position and through the knife blades resulting in a full opening.
 
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