Description
Inflatable Seat Butterfly Valve
The inflatable seat butterfly valve represents an advanced reliable system for fluid flow management in industrial operations.

Features and Benefits
- Inflatable Seat Design: The inflatable seat design provides excellent sealing performance and reduces wear and tear on the valve components, ensuring long service life and low maintenance costs.
- Wide Range of Sizes: The inflatable seat butterfly valve comes in DN50 to DN1000 sizes to fit different pipeline diameters and flow rates.
- Various Material Options: The valve consists of high-quality materials including ASTM A536 65-45-12, WCB, CF8M for the body and material options like Nylon-coated ASTM A536 65-45-12, CF8, CF8M, 2507, and 1.4462 for the disc. The selection of materials allows the valve to work with various media types and operating conditions.
- Multiple Seat Materials: The seat materials can be chosen from EPDM, NBR, FRM or PTFE, providing flexibility and compatibility with various fluids and operating temperatures.
- Stainless Steel Components: The valve’s stem, lower stem, retainer, nuts, and screws are made from corrosion-resistant stainless steel for durability and long-lasting performance.
Specifications
- Size: DN50-DN1000
- Body Material: ASTM A536 65-45-12, WCB, CF8M
- Disc Material: ASTM A536 65-45-12 Nylon-coated, CF8, CF8M, 2507, 1.4462
- Seat Material: EPDM, NBR, FRM, PTFE
- Stem Material: SS420, SS431
- Lower Stem Material: SS420, SS431
- Retainer Material: Nylon for DN50-DN300, SS304 for DN350-DN2000
- Bearing Material: RPTFE with Graphite on I.D.
- Weather Seal Material: NBR
- Nuts Material: Stainless steel
- Plug Material: Steel galvanized for DN50-DN300, Cover plate for DN350-DN2000 material same as body with SS304 bolts
- Screw Material: SS304
Parameter
| NO. | Part name | Material |
| 1 | Body | ASTM A536 65-45-12, WCB, CF8M |
| 2 | Disc | ASTM A536 65-45-12 Nylon coated, CF8, CF8M, 2507, 1.4462 |
| 3 | Seat | EPDM,NBR,FRM.PTFE |
| 4 | Stem | SS420,SS431 |
| 5 | Lower Stem | SS420,SS431 |
| 6 | Retalner | Nylon for DN50-DN300, SS304 for DN350-DN2000 |
| 7 | Bearing | RPTFE with Graphite on I.D. |
| 8 | Weather seal | NBR |
| 9 | Nuts | Stainless steel |
| 10 | Plug | Steel galvanized for DN50-DN300, Cover plate for DN350-DN2000 material same as body with SS304 bolts |
| 11 | Screw | SS304 |
The butterfly valve is closed and the seat is not sealed

The butterfly valve is closed and the seat is sealed

The butterfly valve is open and the valve seat is not sealed
FAQs
What is an inflatable butterfly valve?
The Inflatable Butterfly Valve operates through a specialized design that uses an inflatable elastomer liner or seat as its core component. The inflatable liner functions by expanding and collapsing to manage material flow through pipelines while achieving complete shut-off for abrasive or granular substances.
The valve operates freely when the inflatable liner is deflated which enables unrestricted material flow. The liner inflates after actuation to reach the valve body interior where it stops the flow completely. The inflation process generates a complete 100% full bore seal across the valve which decreases friction while blocking leaks and wear and delivers perfect flow control.
What are the advantages of using inflatable seat butterfly valves over traditional valves?
Superior Sealing: Traditional butterfly valves often struggle to achieve a perfect seal, especially when dealing with coarse or granular media. The inflatable liner of Inflatable Butterfly Valves enables a 100% full bore seal across the valve when inflated which results in a tight shut-off and leakage prevention.
PN10 Flange size
| NPS | DN | OD | PCB | Bolt | n-bolt |
| 3/8 | DN10 | 90 | 60 | 14 | 4 |
| 1/2 | DN15 | 95 | 65 | 14 | 4 |
| 3/4 | DN20 | 105 | 75 | 14 | 4 |
| 1 | DN25 | 115 | 85 | 14 | 4 |
| 11/4 | DN32 | 140 | 100 | 18 | 4 |
| 11/2 | DN40 | 150 | 110 | 18 | 4 |
| 2 | DN50 | 165 | 125 | 18 | 4 |
| 21/2 | DN65 | 185 | 145 | 18 | 8 |
| 3 | DN80 | 200 | 160 | 18 | 8 |
| 4 | DN100 | 220 | 180 | 18 | 8 |
| 5 | DN125 | 250 | 210 | 18 | 8 |
| 6 | DN150 | 285 | 240 | 22 | 8 |
| 8 | DN200 | 340 | 295 | 22 | 8 |
| 10 | DN250 | 395 | 350 | 22 | 12 |
| 12 | DN300 | 445 | 400 | 22 | 12 |
| 14 | DN350 | 505 | 460 | 22 | 16 |
| 16 | DN400 | 565 | 515 | 26 | 16 |
| 18 | DN450 | 615 | 565 | 26 | 20 |
| 20 | DN500 | 670 | 620 | 26 | 20 |
| 24 | DN600 | 780 | 725 | 30 | 20 |
| 28 | DN700 | 895 | 840 | 30 | 24 |
| 32 | DN800 | 1015 | 950 | 33 | 24 |
| 36 | DN900 | 1115 | 1050 | 33 | 28 |
| 40 | DN1000 | 1230 | 1160 | 36 | 28 |
| 48 | DN1200 | 1455 | 1380 | 39 | 32 |
| 56 | DN1400 | 1675 | 1590 | 42 | 36 |
| 64 | DN1600 | 1915 | 1820 | 48 | 40 |
| 72 | DN1800 | 2115 | 2020 | 48 | 44 |
| 80 | DN2000 | 2325 | 2230 | 48 | 48 |
PN16 Flange size
| NPS | DN | OD | PCB | Bolt | n-bolt |
| 3/8 | DN10 | 90 | 60 | 14 | 4 |
| 1/2 | DN15 | 95 | 65 | 14 | 4 |
| 3/4 | DN20 | 105 | 75 | 14 | 4 |
| 1 | DN25 | 115 | 85 | 14 | 4 |
| 11/4 | DN32 | 140 | 100 | 18 | 4 |
| 11/2 | DN40 | 150 | 110 | 18 | 4 |
| 2 | DN50 | 165 | 125 | 18 | 4 |
| 21/2 | DN65 | 185 | 145 | 18 | 8 |
| 3 | DN80 | 200 | 160 | 18 | 8 |
| 4 | DN100 | 220 | 180 | 18 | 8 |
| 5 | DN125 | 250 | 210 | 18 | 8 |
| 6 | DN150 | 285 | 240 | 22 | 8 |
| 8 | DN200 | 340 | 295 | 22 | 12 |
| 10 | DN250 | 405 | 355 | 26 | 12 |
| 12 | DN300 | 460 | 410 | 26 | 12 |
| 14 | DN350 | 520 | 470 | 26 | 16 |
| 16 | DN400 | 580 | 525 | 30 | 16 |
| 18 | DN450 | 640 | 585 | 30 | 20 |
| 20 | DN500 | 715 | 650 | 33 | 20 |
| 24 | DN600 | 840 | 770 | 36 | 20 |
| 28 | DN700 | 910 | 840 | 36 | 24 |
| 32 | DN800 | 1025 | 950 | 39 | 24 |
| 36 | DN900 | 1125 | 1050 | 39 | 28 |
| 40 | DN1000 | 1255 | 1170 | 42 | 28 |
| 48 | DN1200 | 1485 | 1390 | 48 | 32 |
| 56 | DN1400 | 1685 | 1590 | 48 | 36 |
| 64 | DN1600 | 1930 | 1820 | 56 | 40 |
| 72 | DN1800 | 2130 | 2020 | 56 | 44 |
| 80 | DN2000 | 2345 | 2230 | 62 | 48 |
JIS 10k flange size
| NPS | DN | OD | PCB | Bolt | n-bolt |
| 3/8 | DN10 | 90 | 65 | 15 | 4 |
| 1/2 | DN15 | 95 | 70 | 15 | 4 |
| 3/4 | DN20 | 100 | 75 | 15 | 4 |
| 1 | DN25 | 125 | 90 | 19 | 4 |
| 11/4 | DN32 | 135 | 100 | 19 | 4 |
| 11/2 | DN40 | 140 | 105 | 19 | 4 |
| 2 | DN50 | 155 | 120 | 19 | 4 |
| 21/2 | DN65 | 175 | 140 | 19 | 4 |
| 3 | DN80 | 185 | 150 | 19 | 8 |
| 31/2 | (DN90) | 195 | 160 | 19 | 8 |
| 4 | DN100 | 210 | 175 | 19 | 8 |
| 5 | DN125 | 250 | 210 | 23 | 8 |
| 6 | DN150 | 280 | 240 | 23 | 8 |
| 7 | (DN175) | 305 | 265 | 23 | 12 |
| 8 | DN200 | 330 | 290 | 23 | 12 |
| 9 | (DN225) | 350 | 310 | 23 | 12 |
| 10 | DN250 | 400 | 355 | 25 | 12 |
| 12 | DN300 | 445 | 400 | 25 | 16 |
| 14 | DN350 | 490 | 445 | 25 | 16 |
| 16 | DN400 | 560 | 510 | 27 | 16 |
| 18 | DN450 | 620 | 565 | 27 | 20 |
| 20 | DN500 | 675 | 620 | 27 | 20 |
| 22 | (DN550) | 745 | 680 | 33 | 20 |
| 24 | DN600 | 795 | 730 | 33 | 24 |
| 26 | (DN650) | 845 | 780 | 33 | 24 |
| 28 | DN700 | 905 | 840 | 33 | 24 |
| 30 | (DN750) | 970 | 900 | 33 | 24 |
| 32 | DN800 | 1020 | 950 | 33 | 28 |
| 34 | (DN850) | 1070 | 1000 | 33 | 28 |
| 36 | DN900 | 1120 | 1050 | 33 | 28 |
| 40 | DN1000 | 1235 | 1160 | 39 | 28 |
| 44 | DN1100 | 1345 | 1270 | 39 | 28 |
| 48 | DN1200 | 1465 | 1380 | 39 | 32 |















