Pulp and Paper
Emergency Relief Valves and Rupture Pins - Direct replacement for Rupture Disc
The Model C-ASME is the ASME-certified version of our angle body Model C relief valve.
The Model C-ASME is UD stamped. It holds a bubble-tight, closed position until pressure reaches an exact set point. At set point, the valve instantly opens to relieve pressure from a protected system. The valve features a wide variety of pressure ratings and settings.
The Model D is an inline valve that holds a bubble-tight, closed position until pressure reaches an exact set point. At set point, the valve instantly opens to relieve pressure from a protected system
The Model CM is an angle valve that holds a bubble-tight, closed position until pressure reaches an exact set point. At set point, the valve instantly opens to relieve pressure from a protected system.
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Chlorine Dioxide is introduced to the pulp in the D0 tower where it reacts for approximately 1 hour. This first stage chemical reaction removes most of the lignin binding agents in the pulp without destroying the carbohydrates, which would weaken the final product. pH is maintained at a fairly low value (approx 2 - 4 pH) to insure a rapid chemical reaction. A higher pH level would consume more ClO2 for a given degree of bleaching. Temperatures can vary between 45 to 85°C (113 to 185°F).
The stock prep stages will vary by mill depending on the type of paper end product that is required; however nearly all mills will have some form of refining, chemical addition, and screening of the pulp. A typical first stage is to dilute the pulp and pass it through refiners. The refiners shred and flatten the pulp to improve its bonding characteristics. Chemical addition occurs downstream from the refiners.