Throttling
Partially opening a valve to restrict flow and create a pressure drop, used to regulate flow rate, pressure, or level. Globe valves are the best valve design for throttling. Ball valves can throttle but create uneven seat wear. Gate valves must NOT be used for throttling - vibration destroys the seat.
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What is Throttling in the context of industrial valves?
Partially opening a valve to restrict flow and create a pressure drop, used to regulate flow rate, pressure, or level. Globe valves are the best valve design for throttling. Ball valves can throttle but create uneven seat wear. Gate valves must NOT be used for throttling - vibration destroys the seat.
How does Throttling affect valve selection and sizing?
Partially opening a valve to restrict flow and create a pressure drop, used to regulate flow rate, pressure, or level. 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 Throttling 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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