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adapter spool

1. n. [Production]

An extension added to a short face-to-face valve to conform to standard API 6D (or ISO 14313: 1999) face-to-face dimensions. API 6D specifies requirements and gives recommendations for the design, manufacturing, testing and documentation of ball, check, gate and plug valves for application in pipeline systems.

See: API 6D: Specification for Pipeline Valves

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