311N Series Butterfly Valves

The 311N Series Butterfly valves are ideal for use as throttling valves. With the 10-position index plate, it is easy to repeat consistent flow conditions. Compact in design, this valve is used when space is at a premium.

  • PVC body
  • EPDM liner & O-rings
  • 316 Stainless steel index plate & hardware
  • Rugged, corrosion-resistant coated metal handle
  • 100% bubble-tight seal
  • Integral boot seal (flange gaskets not required)
  • Bolt sets include bolts, washers & nuts sized to accomodate butterfly valve & 2 PVC flanges
  • PVC disc with optimized strength/Cv performance
  • Pressure rating: 150 psi @ 70°F
  • Maximum temperature: 140°F
Stock Description Catalog Pg. Price
3" PVC Butterfly Valve
20638
3" PVC Butterfly Valve
$212.52​/Each
Save 5%2+$201.89/Each
Save 10%4+$191.26/Each
Save 15%12+$180.64/Each
P-389
$212.52​/Each
In Stock
4" PVC Butterfly Valve
20639
4" PVC Butterfly Valve
$249.38​/Each
Save 5%2+$236.91/Each
Save 10%4+$224.44/Each
Save 15%12+$211.97/Each
P-389
$249.38​/Each
Special Order
6" PVC Butterfly Valve
20640
6" PVC Butterfly Valve
$377.32​/Each
Save 5%2+$358.45/Each
Save 10%4+$339.58/Each
Save 15%12+$320.72/Each
P-389
$377.32​/Each
In Stock
2" - 3" Butterfly Valve Bolt Sets - Galvanized
18313
2" - 3" Butterfly Valve Bolt Sets - Galvanized
$16.14​/Each
Save 5%2+$15.33/Each
Save 10%4+$14.52/Each
Save 15%12+$13.71/Each
Internet Only
$16.14​/Each
Drop Ship
4" Butterfly Valve Bolt Sets - Galvanized
18314
4" Butterfly Valve Bolt Sets - Galvanized
$33.26​/Each
Save 5%2+$31.59/Each
Save 10%4+$29.93/Each
Save 15%12+$28.27/Each
Internet Only
$33.26​/Each
Drop Ship
6" Butterfly Valve Bolt Sets - Galvanized
18315
6" Butterfly Valve Bolt Sets - Galvanized
$55.67​/Each
Save 5%2+$52.88/Each
Save 10%4+$50.10/Each
Save 15%12+$47.32/Each
Internet Only
$55.67​/Each
Drop Ship
2" -  3" Butterfly Valve Bolt Sets - Zinc Plated
18317
2" - 3" Butterfly Valve Bolt Sets - Zinc Plated
$13.67​/Each
Save 5%2+$12.98/Each
Save 10%4+$12.30/Each
Save 15%12+$11.62/Each
Internet Only
$13.67​/Each
Drop Ship
4" Butterfly Valve Bolt Sets - Zinc Plated
18318
4" Butterfly Valve Bolt Sets - Zinc Plated
$25.50​/Each
Save 5%2+$24.22/Each
Save 10%4+$22.95/Each
Save 15%12+$21.67/Each
Internet Only
$25.50​/Each
Drop Ship
6" Butterfly Valve Bolt Sets - Zinc Plated
18319
6" Butterfly Valve Bolt Sets - Zinc Plated
$45.98​/Each
Save 5%2+$43.68/Each
Save 10%4+$41.38/Each
Save 15%12+$39.08/Each
Internet Only
$45.98​/Each
Drop Ship
2" - 3" Butterfly Valve Bolt Sets - 304 Stainless
18320
2" - 3" Butterfly Valve Bolt Sets - 304 Stainless
$38.00​/Each
Save 5%2+$36.10/Each
Save 10%4+$34.20/Each
Save 15%12+$32.30/Each
Internet Only
$38.00​/Each
Drop Ship
4" Butterfly Valve Bolt Sets - 304 Stainless
18326
4" Butterfly Valve Bolt Sets - 304 Stainless
$86.46​/Each
Save 5%2+$82.13/Each
Save 10%4+$77.81/Each
Save 15%12+$73.49/Each
Internet Only
$86.46​/Each
Drop Ship
6" Butterfly Valve Bolt Sets - 304 Stainless
18327
6" Butterfly Valve Bolt Sets - 304 Stainless
$157.20​/Each
Save 5%2+$149.34/Each
Save 10%4+$141.48/Each
Save 15%12+$133.62/Each
Internet Only
$157.20​/Each
Drop Ship