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Knife Gate Valves for Double Block and Bleed

This Standard Practice covers cast or fabricated, bonneted or bonnetless knife gate valves designed and manufactured to serve as a “Double Block and Bleed” single valve system in pipelines. These valve types shall have flanged body designs compatible with ASME B16.5 flanges for NPS 2 (DN 50) through NPS 24 (DN 600), ASME B16.47 Series A flanges for NPS 26 (DN 650) through NPS 36 (DN 900), and ASME B16.42 for sizes greater than NPS 36 (DN 900).
The valves identified in this Standard Practice are intended for use in applications where a “Double Block and Bleed” type of isolation is required, and where two (2) individual isolation valves with a removable or drain-containing spool piece between them is typically used.


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October 16, 2021

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