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Norriseal Series M285 Butterfly Valves

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Series 285 butterfly valves provide bi-directional, positive shutoff to ANSI 150 standards (285 psig). They feature an exclusive angle disc with a 360° uninterrupted differential sealing surface.

Series 285 butterfly valves offer outstanding flow efficiency, with a rigid-drive, precision disc-to- shaft connection that eliminates load-bearing fasteners in
the flowstream. Double-shaft seals and shaft bushings
assure smooth, low – torque operation.



Sizes  3″ to 36″
Pressure ratings 200 psig
Temperature range -40 °F to 250 °F
Body Cast iron, Ductile iron, Nickel aluminum bronze
Disc Ductile iron, Carbon Steel (WCB), Nickel Aluminum bronze
Seat NBR, EPDM, Fluoroelastomer (Viton)



  • 100% bubble-tight positive shutoff
  • Full rated bi-directional shutoff
  • Field replaceable resilient seat
  • Non-wetted body designs
  • Wide selection of materials available
  • Meets ANSI B16.5 code for Class 150 flange
    pressure/temperature rating
  • Sizes 3” through 36”

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