PureFlex® Fluoropolymer 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".

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.
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 Screws |
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)
Minimum | 15 / 20 |
Maximum on dry bolt threads | 50 / 68 |
Maximum lubricated bolt threads | 35 / 47 |
Pressure Rating

Applications
- 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
Literature
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