MSS SP-81-2006a
This Standard Practice covers all stainless steel orstainless steel lined, cast or fabricated bonnetless,flanged knife gate valves in NPS 2 (DN 50)through NPS 36 (DN 900). The valves in thisStandard Practice are intended for use inapplications where shock loadings are notencountered. Applications at conditions otherthan those specified in Section 3 require specialdesign considerations.