Pneumatic Hard Seal Butterfly Valve
The Hard Seal Pneumatic Butterfly Valve is a high-performance industrial valve designed for high-temperature, high-pressure, and corrosive environments, featuring a metal-to-metal sealing structure (e.g., stainless steel or cobalt-based alloy sealing surfaces). Integrated with a pneumatic actuator, it enables rapid 90° rotation for quick switching or precise flow control, making it ideal for applications in petrochemical,…
Features
① The sealing ring is composed of stacked stainless steel plate and graphite composite plate. It combines the dual advantages of metal hard sealing and elastic sealing, featuring excellent sealing performance at both low and high temperatures, as well as wear resistance, corrosion resistance and long service life.
② The unique extended valve stem structure effectively increases the distance between the actuator and high-temperature medium, providing better heat dissipation.
③ Single-acting pneumatic piston actuator is equipped with a spring return function, which automatically closes the valve in case of sudden air supply failure.
④ The valve features low opening resistance. The butterfly plate sealing surface is an upwardly protruding cone. During opening, all points on the circumference of the butterfly plate disengage from the sealing ring simultaneously, preventing solids from accumulating on the sealing surface.
⑤ Adopting a triple-eccentric sealing structure, the seat and butterfly plate experience almost no friction, with a self-tightening sealing effect that becomes tighter as the valve closes.
★ Valve closing is achieved by elastic compression of the sealing ring, eliminating jamming between the butterfly plate and the sealing ring.
★ Seat replacement is convenient and simple: the seat can be removed simply by taking off the insert, without disassembling the valve body and shaft.
★ With an eccentric shaft and eccentric butterfly plate design, the seat does not contact the butterfly plate during opening or at intermediate positions.
★ Rack-and-pinion double-piston pneumatic actuators are available in double-acting and single-acting (spring return) types, featuring gear drive for safe and reliable operation.
★ The cylinder is made of aluminum alloy, lightweight and aesthetic in appearance. A manual operating mechanism can be mounted on the top or bottom.
★ The rack-and-pinion connection allows adjustment of the opening angle and rated flow.
★ The actuator can be equipped with electric signal feedback indicators and various accessories to realize automatic operation.
★ ISO 5211 standard connection facilitates installation and replacement of the product.
★ Adjustable screws at both ends provide a tuning range of ±4° at 0° and 90° for standard products, ensuring synchronous precision with the valve.
Basic Parameters
Material Specifications
Body & Internal Components
Suitable Media
- Water
- Oil
- Gas
- Various high-temperature or impurity-containing media
Standards Compliance
Main Parameters
| Nominal Diameter (DN) | DN50～DN1200 |
| Operating Power Supply | AC110V, AC220V, AC380V, DC24V |
| Nominal Pressure | 0.6/1.0/1.6/2.5/4.0MPa |
| Control Mode | Regulating or On/Off Control |
| Pneumatic Action Mode | Single Acting (with spring return) or Double Acting |
| Connection Mode | Wafer Type / Flanged Type (Optional) |
| Sealing Form | Metal Hard Sealing |
| Test Pressure | Sealing: 0.66, 1.1, 1.76, 2.2, 2.75, 4.4, 5.5 MPa |
| Shell: 0.9, 1.5, 2.4, 3.0, 3.75, 6.0, 7.5 MPa | |
| Applicable Temperature | ≤540℃ |
| Applicable Medium | Water, Oil, Gas and various high-temperature or impurity-containing media |
| Valve Body Material | Carbon Steel, CF8 Stainless Steel, CF8M Stainless Steel, CF3M Stainless Steel |
| Valve Plate Material | Carbon Steel, CF8 Stainless Steel, CF8M Stainless Steel, CF3M Stainless Steel |
| Sealing Ring Material | Various Stainless Steel Composites |
| Gland Packing Material | Flexible Graphite |
| Protection Grade | IP67 |
| Design and Manufacturing Standards | GB/T 12238-2008, API 609 |
| Inspection and Testing Standards | GB/T 13927-2008, API 598 |
| Flange Connection Standards | GB/T 9124.1-2019, GB/T 9124.2-2019, ASME B16.50 and ASME B16.47 |
Dimension Drawing
1、Installation Dimensions of Wafer Type Hard Seal Pneumatic Butterfly Valve
| Nominal Diameter (DN) | L | D | N-ΦD | H2 | Double Acting | Single Acting | ||||
| H1 | W1 | W2 | H1 | W1 | W2 | |||||
| 50 | 43 | 125 | 4-Φ18 | 112 | 240 | 168 | 83 | 252 | 184 | 95 |
| 65 | 46 | 145 | 4-Φ18 | 115 | 269 | 184 | 95 | 286 | 262 | 109 |
| 80 | 56 | 160 | 4-Φ18 | 120 | 283 | 204 | 103 | 307 | 268 | 122 |
| 100 | 64 | 180 | 4-Φ18 | 138 | 326 | 262 | 109 | 384 | 301 | 142 |
| 125 | 70 | 210 | 4-Φ18 | 164 | 341 | 262 | 109 | 399 | 301 | 142 |
| 150 | 71 | 240 | 4-Φ22 | 175 | 376 | 268 | 122 | 435 | 390 | 152 |
| 200 | 76 | 295 | 4-Φ22 | 208 | 442 | 301 | 142 | 484 | 458 | 174 |
| 250 | 83 | 355 | 4-Φ26 | 243 | 509 | 390 | 152 | 567 | 525 | 206 |
| 300 | 92 | 410 | 4-Φ26 | 283 | 614 | 458 | 174 | 672 | 532 | 226 |
| 350 | 102 | 470 | 4-Φ26 | 310 | 677 | 525 | 206 | 737 | 602 | 260 |
| 400 | 114 | 525 | 4-Φ30 | 340 | 652 | 525 | 206 | 712 | 602 | 260 |
Suitable Flanges for Wafer Type Butterfly Valve
| Nominal Diameter (mm) | D | D1 | D2 | D3 | D4 | n-Φ | H | f | D5 | b |
| 50 | 165 | 125 | 59 | 52 | 52 | 4-Φ 18 | 20 | 3 | 62 | 8 |
| 65 | 185 | 145 | 122 | 75 | 67 | 4-Φ 18 | 20 | 3 | 78 | 8 |
| 80 | 200 | 160 | 133 | 91 | 82 | 8-Φ 18 | 20 | 3 | 91 | 8 |
| 100 | 220 | 180 | 158 | 110 | 102 | 8-Φ 18 | 22 | 3 | 116 | 8 |
| 125 | 250 | 210 | 184 | 135 | 127 | 8-Φ 18 | 22 | 3 | 142 | 8 |
| 150 | 285 | 240 | 212 | 161 | 152 | 8-Φ 22 | 24 | 3 | 170 | 10 |
| 200 | 340 | 295 | 268 | 221 | 208 | 12-Φ 22 | 26 | 3 | 221 | 10 |
| 250 | 405 | 355 | 320 | 275 | 255 | 12-Φ 26 | 29 | 3 | 275 | 10 |
| 300 | 460 | 410 | 370 | 327 | 308 | 12-Φ 26 | 32 | 4 | 326 | 14 |
| 350 | 520 | 470 | 430 | 379 | 355 | 16-Φ 26 | 34 | 4 | 358 | 14 |
| 400 | 580 | 525 | 482 | 429 | 405 | 16-Φ 30 | 36 | 4 | 409 | 14 |
| 450 | 640 | 585 | 532 | 481 | 455 | 20-Φ 30 | 38 | 4 | 460 | 16 |
| 500 | 715 | 650 | 585 | 532 | 505 | 20-Φ 33 | 42 | 4 | 511 | 16 |
| 600 | 840 | 770 | 685 | 633 | 605 | 20-Φ 36 | 44 | 5 | 613 | 18 |
2.Installation Dimensions of Flanged Hard Seal Pneumatic Butterfly Valve
| DN (mm) | L | D1 | D2 | n-Φd | B | C | H2 | Double Acting | Single Acting | ||||
| H1 | W1 | W2 | H1 | W1 | W2 | ||||||||
| 50 | 108 | 125 | 165 | 4-Φ18 | 16 | 2 | 112 | 240 | 168 | 83 | 252 | 184 | 95 |
| 65 | 112 | 145 | 185 | 4-Φ18 | 16 | 2 | 115 | 269 | 184 | 95 | 286 | 262 | 109 |
| 80 | 114 | 160 | 200 | 8-Φ18 | 18 | 2 | 120 | 283 | 204 | 103 | 307 | 268 | 122 |
| 100 | 127 | 180 | 220 | 8-Φ18 | 20 | 3 | 138 | 326 | 262 | 109 | 384 | 301 | 142 |
| 125 | 140 | 210 | 250 | 8-Φ18 | 22 | 3 | 164 | 341 | 262 | 109 | 399 | 301 | 142 |
| 150 | 140 | 240 | 285 | 8-Φ22 | 24 | 3 | 175 | 376 | 268 | 122 | 435 | 390 | 152 |
| 200 | 152 | 295 | 340 | 12-Φ22 | 24 | 3 | 208 | 442 | 301 | 142 | 484 | 458 | 174 |
| 250 | 165 | 355 | 405 | 12-Φ26 | 26 | 3 | 243 | 509 | 390 | 152 | 567 | 525 | 206 |
| 300 | 178 | 410 | 460 | 16-Φ26 | 28 | 3.5 | 283 | 614 | 458 | 174 | 672 | 532 | 226 |
| 350 | 190 | 470 | 520 | 16-Φ30 | 30 | 3.5 | 310 | 677 | 525 | 206 | 737 | 602 | 260 |
| 400 | 216 | 525 | 580 | 20-Φ30 | 32 | 3.5 | 340 | 675 | 525 | 206 | 735 | 602 | 260 |
