D643H Pneumatic Hard Seal Butterfly ValveDetailed product description：

Product Features
1. This valve adopts a three eccentric sealing structure, with almost no wear on the valve seat and butterfly plate, and has a sealing function that becomes tighter as viewed.
2. The sealing ring is made of stainless steel, which has the dual advantages of metal hard sealing and elastic sealing. It has excellent sealing performance in both low and high temperatures, corrosion resistance, and long service life.
3. The sealing surface of the disc plate is made of welded cobalt based hard alloy, which is wear-resistant and has a long service life
4. The large-sized butterfly plate adopts a frame structure with high strength, large overcurrent area, and low flow resistance.
5. This valve has a bidirectional sealing function, which is not limited by the flow direction of the medium or the spatial position during installation, and can be installed in any direction.
6. The drive device can be installed in multiple stations (rotated 90 ° or 180 °) for easy user use.

Main technical parameters of D643H pneumatic hard seal butterfly valve:

Nominal meridian DN (mm)	50~2000
Nominal pressure PN (MPa)	zero point six	one	one point six	two point five
Sealing test (MPa)	zero point six six	one point one	one point seven six	two point seven five
Strength test (MPa)	zero point nine	one point five	two point four	three point seven five
Applicable temperature	Carbon steel: -29 ℃~425 ℃ Stainless steel: -40 ℃~650 ℃
Applicable Medium	Water, air, natural gas, oil products, and weakly corrosive fluids
leakage rate	Compliant with GB/T13927-92 standard
Drive Type	Worm gear transmission, electric, pneumatic, hydraulic

D643H Pneumatic Hard Seal Butterfly Valve Main Component Materials:

Part Name	Material
valve body	WCB、 Alloy steel, stainless steel QT450-10
butterfly valve disc	WCB、 Alloy steel, stainless steel QT450-10
valve stem	2Cr13 stainless steel, alloy steel
Seal ring	stainless steel ring
filler	flexible graphite

D643H pneumatic hard seal butterfly valve adopts the standard:

Manufacturing Standard	JB/T 8527-97
Flange Standard	GB9113-2000
Structural length standard	GB12221-89
Inspection Criteria	GB/T 13927-92

D643H-10/16/25/Pneumatic hard seal butterfly valve Main external connection dimensions: (unit: mm)

The nominal meridian (DN)

Main dimensions

Flange size and bolt specifications

1.0MPa

1.6MPa

2.5MPa

L

H1

H

D

D1

n-Фd

D

D1

n-Фd

D

D1

n-Фd

fifty

one hundred and eight

three hundred and fifty

one hundred and twelve

one hundred and sixty-five

one hundred and twenty-five

4-18

one hundred and sixty-five

one hundred and twenty-five

4-18

one hundred and sixty-five

one hundred and twenty-five

4-18

sixty-five

one hundred and twelve

three hundred and seventy

one hundred and fifteen

one hundred and eighty-five

one hundred and forty-five

4-18

one hundred and eighty-five

one hundred and forty-five

4-18

one hundred and eighty-five

one hundred and forty-five

8-18

eighty

one hundred and fourteen

three hundred and eighty

one hundred and twenty

two hundred

one hundred and sixty

4-18

two hundred

one hundred and sixty

8-18

two hundred

one hundred and sixty

8-18

one hundred

one hundred and twenty-seven

four hundred and twenty

one hundred and thirty-eight

two hundred and twenty

one hundred and eighty

8-18

two hundred and twenty

one hundred and eighty

8-18

two hundred and thirty-five

one hundred and ninety

8-22

one hundred and twenty-five

one hundred and forty

four hundred and sixty

one hundred and sixty-four

two hundred and fifty

two hundred and ten

8-18

two hundred and fifty

two hundred and ten

8-18

two hundred and seventy

two hundred and twenty

8-26

one hundred and fifty

one hundred and forty

five hundred and fifty-five

one hundred and seventy-five

two hundred and eighty-five

two hundred and forty

8-22

two hundred and eighty-five

two hundred and forty

8-22

three hundred

two hundred and fifty

8-26

two hundred

one hundred and fifty-two

seven hundred and sixty

two hundred

three hundred and forty

two hundred and ninety-five

8-22

three hundred and forty

two hundred and ninety-five

12-22

three hundred and sixty

three hundred and ten

12-26

two hundred and fifty

one hundred and sixty-five

eight hundred and thirty

two hundred and forty-three

three hundred and ninety-five

three hundred and fifty

12-22

four hundred and five

three hundred and fifty-five

12-26

four hundred and twenty-five

three hundred and seventy

12-30

three hundred

one hundred and seventy-eight

eight hundred and ninety-five

two hundred and fifty

four hundred and forty-five

four hundred

12-22

four hundred and sixty

four hundred and ten

12-26

four hundred and eighty-five

four hundred and thirty

16-30

three hundred and fifty

one hundred and ninety

nine hundred and fifty

two hundred and eighty

five hundred and five

four hundred and sixty

16-22

five hundred and twenty

four hundred and seventy

12-26

five hundred and fifty-five

four hundred and ninety

16-33

four hundred

two hundred and sixteen

one thousand one hundred and ninety

three hundred and five

five hundred and sixty-five

five hundred and fifteen

16-26

five hundred and eighty

five hundred and twenty-five

16-26

six hundred and twenty

five hundred and fifty

16-36

four hundred and fifty

two hundred and twenty-two

one thousand two hundred and fifty-five

three hundred and fifty

six hundred and fifteen

five hundred and sixty-five

20-26

six hundred and forty

five hundred and eighty-five

16-30

six hundred and seventy

six hundred

20-36

five hundred

two hundred and twenty-nine

one thousand three hundred and five

three hundred and eighty

six hundred and seventy

six hundred and twenty

20-26

seven hundred and fifteen

six hundred and fifty

20-30

seven hundred and thirty

six hundred and sixty

20-36

six hundred

two hundred and sixty-seven

one thousand three hundred and forty

four hundred and forty-five

seven hundred and eighty

seven hundred and twenty-five

20-30

eight hundred and forty

seven hundred and seventy

20-33

eight hundred and forty-five

seven hundred and seventy

20-39

seven hundred

two hundred and ninety-two

one thousand five hundred and twenty

four hundred and eighty

eight hundred and ninety-five

eight hundred and forty

24-30

nine hundred and ten

eight hundred and forty

24-36

nine hundred and sixty

eight hundred and seventy-five

24-42

eight hundred

three hundred and eighteen

one thousand seven hundred and ten

five hundred and thirty

one thousand and fifteen

nine hundred and fifty

24-33

one thousand and twenty-five

nine hundred and fifty

24-39

one thousand and eighty-five

nine hundred and ninety

24-48

nine hundred

three hundred and thirty

one thousand eight hundred and ten

five hundred and eighty

one thousand one hundred and fifteen

one thousand and fifty

28-33

one thousand one hundred and twenty-five

one thousand and fifty

28-39

one thousand one hundred and eighty-five

one thousand and ninety

28-48

one thousand

four hundred and ten

one thousand nine hundred and sixty

six hundred and fifty

one thousand two hundred and thirty

one thousand one hundred and sixty

28-36

one thousand two hundred and fifty-five

one thousand one hundred and seventy

28-42

one thousand three hundred and twenty

one thousand two hundred and ten

28-56

one thousand and two hundred

four hundred and seventy

two thousand two hundred and fifty

seven hundred and sixty

one thousand four hundred and fifty-five

one thousand three hundred and eighty

32-39

one thousand four hundred and eighty-five

one thousand three hundred and ninety

32-48

one thousand five hundred and thirty

one thousand four hundred and twenty

32-56