Bore
The inside diameter of the valve flow passage. Full bore (full port): the bore equals the pipe ID, minimising pressure drop - preferred for pigging and high-flow services. Reduced bore (standard port): the bore is smaller than the pipe ID, used where pressure drop is acceptable and cost savings desired.
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Frequently Asked Questions
What is Bore in the context of industrial valves?
The inside diameter of the valve flow passage. Full bore (full port): the bore equals the pipe ID, minimising pressure drop - preferred for pigging and high-flow services. Reduced bore (standard port): the bore is smaller than the pipe ID, used where pressure drop is acceptable and cost savings desired.
How does Bore affect valve selection and sizing?
The inside diameter of the valve flow passage. Valve sizing must account for this phenomenon to prevent premature failure, excess noise, and vibration. For control valves, ISA-75.01 and IEC 60534-2-1 cover sizing for incompressible and compressible flow. Vajra Industrial Solutions can assist with valve sizing calculations - contact sales@vajravyuh.com with your process data sheet.
What valve types minimise Bore problems?
The choice of valve type and trim significantly affects susceptibility to flow-related problems. Anti-cavitation trims, low-noise cages, multi-stage pressure reduction, and proper Cv sizing reduce velocity-related damage. For critical applications, control valve sizing is performed using the ISA/IEC methodology with FL (liquid pressure recovery factor) and Fd (valve style modifier) for the specific valve geometry.
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