As is well known, the size of the valve diameter is inevitably related to the size of the pipeline. Generally speaking, the larger the diameter (outer diameter) of the valve, the larger the valve. The valve diameter needs to be calculated based on actual parameters. Generally speaking, pipelines are larger, while valves are actually smaller, mainly depending on the flow rate that needs to be controlled by the valve position. The pipeline size only needs to have sufficient flow capacity.
(1) Comparison Table of Pipe Size and Valve Diameter and Inches:
Diameter inches
DN diameter (mm)
Outer diameter of pipeline (mm)
1/4″
eight
thirteen point seven
3/8″
ten
seventeen point one four
1/2″
fifteen
twenty-one point three
3/4″
twenty
twenty-six point seven
1″
twenty-five
thirty-three point four
1.2″
thirty-two
forty-two point two
1.5″
forty
forty-eight point three
2″
fifty
sixty point three
2.5″
sixty-five
seventy-three
3″
eighty
eighty-eight point nine
4″
one hundred
one hundred and fourteen point three
5″
one hundred and twenty-five
one hundred and forty-one point three
6″
one hundred and fifty
one hundred and sixty-eight point three
8″
two hundred
two hundred and nineteen point one
10″
two hundred and fifty
two hundred and seventy-three
12″
three hundred
three hundred and twenty-three point eight
14″
three hundred and fifty
three hundred and fifty-five point six
16″
four hundred
four hundred and six point four
(2) Valve diameter DN (nominal diameter) corresponds to the outer diameter of the pipe (mm):
Nominal diameter (DN)
Outer diameter of pipeline (small outer diameter)
Outer diameter of pipeline (large outer diameter)
fifteen
eighteen
twenty-two
twenty
twenty-five
twenty-seven
twenty-five
thirty-two
thirty-four
thirty-two
thirty-eight
forty-two
forty
forty-five
forty-eight
fifty
fifty-seven
sixty
sixty-five
seventy-three
seventy-six
eighty
eighty-nine
eighty-nine
one hundred
one hundred and eight
one hundred and fourteen
one hundred and twenty-five
one hundred and thirty-three
one hundred and forty
one hundred and fifty
one hundred and fifty-nine
one hundred and sixty-eight
two hundred
two hundred and nineteen
two hundred and nineteen
two hundred and fifty
two hundred and seventy-three
two hundred and seventy-three
three hundred
three hundred and twenty-four
three hundred and twenty-five
three hundred and fifty
three hundred and sixty
three hundred and seventy-seven
four hundred
four hundred and six
four hundred and twenty-six
four hundred and fifty
four hundred and fifty-seven
four hundred and eighty
five hundred
five hundred and eight
five hundred and thirty
six hundred
six hundred and ten
six hundred and thirty
seven hundred
seven hundred and twenty
eight hundred
eight hundred and twenty
nine hundred
nine hundred and twenty
one thousand
one thousand and twenty
one thousand and two hundred
one thousand two hundred and twenty
one thousand and four hundred
one thousand four hundred and twenty
one thousand and six hundred
one thousand six hundred and twenty
one thousand and eight hundred
one thousand eight hundred and twenty
two thousand
two thousand and twenty