Butterfly Valves for Pulp & Paper
Pulp and paper mills present some of the most chemically aggressive valve service environments — kraft black liquor, chlorine dioxide bleach, digester steam, and tall oil — requiring rubber-lined, SS316L, or Hastelloy C-276 butterfly valves with metal seats for reliable isolation.
Key Applications — Butterfly Valves in Pulp & Paper
Black Liquor & Kraft Liquor Lines
Kraft pulping black liquor (pH 13–14, 70% solids) lines require rubber-lined butterfly valves or SS316L triple-offset butterfly valves — black liquor is highly corrosive and abrasive at high solids concentration.
API 609 Cat B, DN100–DN600, SS316L body, Hastelloy C-276 disc, PTFE-encapsulated metal seat, or natural rubber-lined body, full vacuum rating
Bleach Plant — ClO₂ & Chlorine Service
Chlorine dioxide (ClO₂), elemental chlorine-free (ECF) bleach plant valves require chemically resistant materials — rubber-lined butterfly valves with EPDM or Viton seats, or PVDF-lined bodies for strong oxidising acids.
API 609 Cat A, DN80–DN400, rubber-lined (EPDM or Viton seat), SS316 disc, or PVDF-lined body, ASME B16.34, max 10 bar, anti-static
Digester Steam & Cooking Liquor
Continuous digester steam and hot cooking liquor (white liquor, 170°C) butterfly valves require high-temperature seat materials and SS316L trim — triple-offset design for tight shutoff against hot caustic white liquor.
API 609 Cat B, DN100–DN500, SS316L body and disc, graphite or Hastelloy seats, triple-offset design, 170°C rated, flanged ASME B16.5 Class 150
Recovery Boiler Flue Gas & Smelt
Recovery boiler combustion air, flue gas, and smelt dissolving tank isolation require high-temperature butterfly valves — carbon steel bodies with refractory lining for flue gas duct applications at 200–400°C.
API 609 Cat B, DN400–DN1200, carbon steel + refractory liner, alloy steel disc, graphite seal, 200–400°C, gear operator, large-bore flanged
Tall Oil & Rosin Process Lines
Tall oil distillation units and rosin processing lines require SS316L butterfly valves resistant to organic acids — PTFE-lined or triple-offset with PTFE-coated disc for fatty acid and resin acid service.
API 609 Cat B, DN50–DN200, SS316L body, PTFE disc coating or PTFE seat, Class 150, max 200°C, organic acid service
Required Certifications
Recommended Materials
Selection Factors
Technical FAQs
What material butterfly valves are used for kraft black liquor service?
Can standard butterfly valves be used in the bleach plant?
What butterfly valve design is needed for recovery boiler combustion air ducting?
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Butterfly Valves for Pulp & Paper
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