Fabricast Is Compliant With Both MSS SP-81 & AWWA C520 Specifications.

AWWA C520-10
Name: Knife Gate Valve, Sizes 50 mm (2 in) through 2400 mm (92 in)
Code: AWWA C520
Description: American Water Works Association. This standard describes bonneted, bonnetless and one- and two-piece fabricated stainless steel and cast ductile-iron body knife gate valves with resilient or metal seats, including tapping knife gate valves, for use in water, wastewater, and reclaimed water systems with pH range from 6 to 12 and a temperature range from 33ºF to 125ºF (0.6ºC to 52ºC). The minimum design pressure shall be 150 psig (1,034 kPa) for nominal sizes 2 in. to 24 in. (50 mm-600 mm), and the minimum design pressure for nominal sizes 30 in. to 96 in. minimum (750 mm-2,400 mm) shall be 25 psig (172 kPa), 75 psig (517 kPa), and 150 psig (1,034 kPa).
Type: Specification
MSS SP-81-2013
Name: Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends
Code: MSS SP-81-2013
Description: This Standard Practice covers all stainless-steel or stainless-steel-lined, cast, or fabricated bonnetless, knife gate valves with flanged ends from size NPS 2 (DN 50) through NPS 36 (DN 900).