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MSS SP 81

Stainless Steel, Bonnetless, Flanged Knife Gate Valves

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Organization: MSS
Publication Date: 1 January 2001
Status: inactive
Page Count: 9
scope:

This standard covers all stainless steel or stainless steel lined, cast or fabricated bonnetless, flanged knife gate valves in sizes NPS 2 (DN 50) through NPS 36 (DN 900). The valves in this standard are intended for use in applications where shock loadings are not encountered. Applications at conditions other than those specified in Section 3 require special design considerations.

Document History

SP-81
January 1, 2021
Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends
SCOPE AND FIELD OF APPLICATION 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)...
SP-81
January 1, 2021
Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends
A description is not available for this item.
MSS SP 81
January 1, 2017
Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends
SCOPE AND FIELD OF APPLICATION  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...
MSS SP 81
January 1, 2013
Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends
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). The...
MSS SP 81
January 1, 2006
Stainless Steel, Bonnetless, Flanged Knife Gate Valves
This Standard Practice covers all stainless steel or stainless steel lined, cast or fabricated bonnetless, flanged knife gate valves in NPS 2 (DN 50) through NPS 36 (DN 900). The valves in this...
MSS SP 81
January 1, 2006
Stainless Steel, Bonnetless, Flanged Knife Gate Valves
This Standard Practice covers all stainless steel or stainless steel lined, cast or fabricated bonnetless, flanged knife gate valves in NPS 2 (DN 50) through NPS 36 (DN 900). The valves in this...
MSS SP 81
January 1, 2001
Stainless Steel, Bonnetless, Flanged Knife Gate Valves
This standard covers all stainless steel or stainless steel lined, cast or fabricated bonnetless, flanged knife gate valves in sizes NPS 2 (DN 50) through NPS 36 (DN 900). The valves in this standard...
MSS SP 81
January 1, 2000
Stainless Steel, Bonnetless, Flanged Knife Gate Valves
SCOPE AND FIELD OF APPLICATION This standard covers all stainless steel or stainless steel lined, cast or fabricated bonnetless, flanged knife gate valves in sizes NPS 2 (DN 50) through NPS 36 (DN...
MSS SP 81
January 1, 1995
Stainless Steel, Bonnetless, Flanged Knife Gate Valves
A description is not available for this item.
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References

This document references:
ASME B16.5 - Pipe Flanges and Flanged Fittings NPS ½ Through NPS 24 Metric/Inch Standard
Published by ASME on January 1, 2020
(a) This Standard covers pressure–temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. Included are (1)...
This document references:
MSS SP 61 - PRESSURE TESTING OF VALVES
Published by MSS on January 1, 2019
This Standard Practice establishes requirements and acceptance criteria for shell and seat closure pressure testing of valves.
This document references:
MSS SP 25 - Standard Marking System for Valves, Fittings, Flanges, and Unions
Published by MSS on January 1, 2018
This standard marking system applies to the marking of new valves, fittings, flanges, and unions used in piping connections that include (but are not limited to) flanged, soldered, brazed, threaded,...
This document references:
A126 - Standard Specification for Gray Iron Castings for Valves, Flanges, and Pipe Fittings
May 1, 2004
This specification covers three classes of gray iron for castings intended for use as valve pressure-retaining parts, pipe fittings, and flanges. The values stated in inch-pound units are to be...
This document references:
A240/A240M REV A - Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
November 1, 2023
This specification2 covers chromium, chromium-nickel, and chromium-manganese-nickel stainless steel plate, sheet, and strip for pressure vessels and for general applications including architectural,...
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