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manufactured in the usa

PureFlex® Fluoropolymer Lined Butterfly Valve, 890 Series

The PureFlex® Series 890 Butterfly Valve bodies are manufactured from Derakane 411 vinyl ester reinforced with ECR glass fiber in a proprietary process developed by PureFlex providing outstanding corrosion resistance to thousands of medias. The Lug and Full-Face 890 valves offer full flange support in FRP and light gauge metal piping systems.

The heavy cross section of the Series 890 Full-Faced and Lug PureFlex valve also provide complete support for FRP pipe flanges which eliminates the problem of piping flange breakage at installation. The Lug style valves are directly threaded and possess steel-like thread strength to resist high torque loading. PureFlex Series 890 Butterfly Valves are available in sizes 14"-42".

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Product Features & Benefits

  • IN SIZES 14” AND LARGER: The world’s first all-composite butterfly valve in sizes 14” and larger.
  • CORROSION RESISTANT: Manufactured with indestructible glass fiber reinforced Derakane 411 resin structure with double synthetic veil/ECR Derakane 411 corrosion liner. Valve Body rated to 150 psig, tested per MSS SP-68. Shell safety factor over 20x maximum rated working pressure.
  • DESIGNED FOR EXTENDED SERVICE LIFE: Pureflex® 890 butterfly valve is designed for extended service life in hostile, demanding applications where expensive heavy alloy and lined valves fail.
  • QUICK SEAT REPLACEMENT: Double offset viton seat retainer. Can be replaced in (60) seconds.
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Technical Details

Materials of Construction

890 Series Valve Parts List

Item Description Material
1 Top Gland Bolts 304 Stainless Steel
2 Top Gland 316 Stainless Steel
3 Shaft Retainer Ring 316 Stainless Steel
4 Shaft 17-4PH SS/Derakane 470
5 Top Packing Virgin PTFE V-Rings
6 Valve Body Fiberglass reinforced Vinyl Ester
7 Disc Spacer Glass-reinforced PTFE
8 Disc Fiberglass reinforced Vinyl Ester
9 Bottom Packing Virgin PTFE V-Rings
10 Bottom Gland 316 Stainless Steel
11 Bottom Gland Bolts 304 Stainless Steel
12 Nuts, Bottom Shield 304 Stainless Steel
13 Lock Washers 304 Stainless Steel
14 Hex Head Cap
304 Stainless Steel
15 Bottom Shield Epoxy-coated Carbon Steel
16 Seat Ring Viton/Aluminum
back-up ring

Technical Details

Flanged Bolt Requirements

Size (in.) Size (mm) No. Bolts Diameter
  CF = Consult Factory
14" 350 12 1.00
16" 400 16 1.00
18" 450 16 1.12
20" 500 20 1.12
24" 600 20 1.25
26" 650 24 1.25
30" 750 28 1.25
36" 900 32 1.50
42" CF 36 1.50

Flange Bolt Torques (ft-lbs. / NM)

Minimum15 / 20
Maximum on dry bolt threads50 / 68
Maximum lubricated bolt threads35 / 47

Pressure Rating


  • Chlorinated Brine
  • Chlorine Dioxide
  • Chlorinated Water
  • Wet Chlorine Gas
  • Sodium Chlorate
  • Sulfuric Acid
  • Phosphoric Acid
  • Hydrobromic Acid
  • Hydrochloric Acid
  • Planting Solutions
  • Pesticides
  • Flue Gas Scrubbers
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