We have several relief valve stations that require full port gates (a common requirement at relief valves). This is not a problem for sizes 3" and above, because gates in these sizes are full port by design in most cases. But gate valves 1 1/2" and below (forged) are supplied as reduced port by default and 2" could be either reduced or full (forged or cast).OK - the problem is that these small bore relief stations are already built and we didn't purchase full port valves (1 1/2" and less). oooooops.We are trying to justify the use of reduced port valves by comparing the port area of the reduced port gate valve and the port area of the relief valve and saying, "the port area of the gate is much larger than the port area of the relief valve, so reduced port gates should be OK".We are trying to justify the use of reduced port valves by comparing the port area of the reduced port gate valve and the port area of the relief valve and saying, "the port area of the gate is much larger than the port area of the relief valve, so reduced port gates should be OK".Questions - 1. What are the reasons for using full port gates at relief stations, other than the obvious port area/flow issues?2. Do thermal reliefs need full port gates?

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