Reduced Bore (Standard Port)
A ball or gate valve where the internal bore is smaller than the nominal pipe size, creating a venturi-like restriction. Results in higher pressure drop but smaller, lighter, and cheaper valve than full bore equivalent. Suitable where pigging is not required and pressure drop is acceptable.
Related Terms
Related Products
Frequently Asked Questions
What is Reduced Bore (Standard Port) in the context of industrial valves?
A ball or gate valve where the internal bore is smaller than the nominal pipe size, creating a venturi-like restriction. Results in higher pressure drop but smaller, lighter, and cheaper valve than full bore equivalent. Suitable where pigging is not required and pressure drop is acceptable.
How does Reduced Bore (Standard Port) affect valve selection and sizing?
A ball or gate valve where the internal bore is smaller than the nominal pipe size, creating a venturi-like restriction. 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 Reduced Bore (Standard Port) 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.
Need a Quote?
API 6D certified valves. Ships to 357+ cities worldwide. 24h response.
Request QuoteContact EngineerAll Categories
Technical Support
Have a Technical Question?
Our valve engineers can help specify the right valve for your application. Full project documentation available: MTCs, test reports, dimensional inspection, and third-party inspection coordination.