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[djack77494]

Guest:
It is common for valves to have reduced ports, meaning that the minimum cross-sectional (flow) area of the valve may be significantly less than the cross-sectional area of the connecting pipes. Avoiding this through the use of "full port" valves can be an expensive proposition as full port valves often sell at a significant premium relative to reduced port valves.

So, why might you want a full port control valve? Well, it would be pretty rare that you would. About the only justification I can see for using one would be in situations where pressure drop is critical. Then, perhaps, you might not be able to tolerate the additional pressure drop that a reduced port valve would generate.

Doug