Nominal diameter DN (mm)

fifteen

twenty

twenty-five

thirty-two

forty

fifty

sixty-five

eighty

one hundred

one hundred and twenty-five

one hundred and fifty

two hundred

Flow coefficient Kv

Single seat, three-way connection

five

eight

twelve

seventeen

twenty-nine

forty-three

seventy

one hundred and ten

one hundred and sixty-five

two hundred and seventy-five

four hundred and forty

six hundred

sleeve

twelve

seventeen

twenty-nine

forty-three

seventy

one hundred and ten

one hundred and sixty-five

two hundred and seventy-five

four hundred and forty

six hundred

Rated travel L (mm)

— — 8

twelve

twenty

twenty-five

forty

Leakage rate l/h

hard seal

Single seat: 0.01% x valve rated capacity; Sleeve: 0.5% x valve rated capacity

soft seal

Grade VI

Allowable pressure difference (Mpa)

Single seat, three-way connection

six point four

five point zero nine

two point nine one

one point eight five

two point one eight

one point three three

one point five two

zero point nine nine

zero point six two

zero point six

zero point six nine

zero point three nine

sleeve

six point four