This Standard Practice establishes requirements and criteria for stainless-steel-lined, cast, or fabricated
bonnetless, low pressure knife gate valves that are 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).
The valves identified in this new SP-154 are intended for use in applications where shock loadings are not
encountered and where a "Double Block and Bleed" type of isolation is required, and where two individual isolation
valves with a removable or drain-containing spool piece between them is typically used.
NOTE: For the purpose of this Standard Practice, "Double Block and Bleed" refers to a valve (or valve application) with
two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve with a means of
venting/bleeding the cavity between the seating surfaces.
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| Number of Pages : | 10 |
| Published : | 03/01/2018 |
