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Applies to nominal pipe sizes (NPS) 2 inches and smaller .

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This standard covers the design, materials, dimensions, testing, and marking requirements for instrument valves. These are small-bore valves typically used in pressure instrumentation, hydraulic systems, and process control. Applies to nominal pipe sizes (NPS) 2 inches and smaller

The standard details requirements for:

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: Conducted on pre-production prototypes to validate a design's integrity. This includes a hydrostatic proof test at twice the working pressure and a burst test where the valve is pressurized until rupture to determine its ultimate safety margin.