There are actually three versions of port size: Full Port is "true full", and can be a relative term based on theREDUCING VALVES I.D. of your Pipe (Schedule of your pipe). Regular Port, or Standard Port is one pipe size down. Reduced Port is MULTI-FUNCTIONAL WATER PUMP CONTROL VALVEpipe sizes downRegular port- when ball valves came out, this was the standard port size which was, as said in other strings, 1 port size smaller than the line size. Full port- as logic has it, a WATER POWER CONTROL VALVEfull line size according to sch 40 pipe.Full Port is "true full", and can be a FILTER SERIESrelative term based on the I.D. of your Pipe (Schedule of your pipe). Note, a full port valve is not full line size if you are talking sch 10 pipe- can cause pigging problems. Reduced port- this was aBALANCING VALVES way to drive costs down further in valves and is actually a port size smaller than regular port valves. Not seen very often now, but was more prevalent in the 70's!

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