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Hard Seal Pneumatic Flange Triple Eccentric Butterfly Valve
Hard Seal Pneumatic Flange Triple Eccentric Butterfly Valve
- Valve Size: DN50~DN400
- Body Material: Stainless Steel SS304/SS316 and Carbon Steel
- Disc Material: Stainless Steel SS304/SS316
- Seal Material: Metal Hard Seal
- Work Temperature: -29~+425 Degree
- Flanged Connection: ISO 5211 or DIN 3337 Standard
- Pressure Rating: PN10/PN16 ANSI150, DIN16, JIS 10K/16K
- Medium: Water, Oil, Gas, Powder, Chemical etc….
- Actuator Model: HPA Pneumatic Actuator Double Acting/Spring Return
- Protection Class: Weatherproof – lP67
Product Overview
The Hard Seal Pneumatic Flange Triple Eccentric Butterfly Valve combines a flange-style hard-seal valve body with a pneumatic actuator for reliable performance in high-pressure applications.
Hard Seal Pneumatic Flange Triple Eccentric Butterfly Valve consists of flange hard seal butterfly valve and pneumatic actuator. The flanges at both ends of the butterfly valve body are connected to the pipeline flange, which has the advantage of relatively reliable sealing performance. Pneumatic flange butterfly valve can be divided into elastic seal and metal seal according to the sealing form. The elastic sealing materials are nitrile rubber and fluororubber. Among them, the hard seal butterfly valve is a multi-layer metal hard seal with the advantage of elastic seal. It has excellent sealing performance regardless of low temperature. Compared with the clamp-type butterfly valve, the pneumatic flange butterfly valve has higher pressure resistance. Generally, flange butterfly valves are used in high-pressure working conditions.
Features & Benefits
- Superior Flanged Integrity: Unlike wafer-style valves, the integral flanged body provides a more secure, bolted connection directly to the pipeline. This design is ideal for higher-pressure systems, end-of-line service, and applications where vibrational stress might be a concern, ensuring maximum operational safety and stability.
- Friction-Free, Long-Life Sealing: The sophisticated triple eccentric geometry ensures the disc lifts off the metal seat almost immediately upon opening, creating a cam-like action that eliminates friction and wear. This Hearken design guarantees lower operating torque and a significantly extended, maintenance-free service life.
- Extreme Condition Performance: With a solid metal hard seal, this valve operates flawlessly in a wide thermal range from -29°C to 425°C. It is inherently fire-safe and excels at handling challenging media like superheated steam, hot gases, oils, and light slurries where conventional soft-seated valves would quickly fail.
- Precision Automated Control: Equipped with a high-performance pneumatic actuator (available in double-acting or spring-return configurations), this valve package offers responsive and reliable automation. The IP67-rated enclosure protects the actuator from dust and water ingress, ensuring dependable operation in the toughest plant environments.
Parts and Material
![]() | No. | Part Name | Material |
| 1 | Hexagon Socket Screw | Stainless Steel | |
| 2 | Valve Bonnet | Carbon Steel/Stainless Steel | |
| 3 | Gasket | Stainless Steel | |
| 4 | Valve Seat | Stainless Steel + Graphite, PTFE | |
| 5 | Gasket | Stainless Steel | |
| 6 | Valve Disc | Carbon Steel/Stainless Steel | |
| 7 | Straight Pin | 45# Steel/Stainless Steel | |
| 8 | Bottom Cover | Carbon Steel/Stainless Steel | |
| 9 | Gasket | Stainless Steel + Graphite, PTFE | |
| 10 | Bushing | PTFE Composite Bearings | |
| 11 | Valve Body | Carbon Steel/Stainless Steel | |
| 12 | Valve Stem | Stainless Steel | |
| 13 | Connecting Bracket | Carbon Steel | |
| 14 | Bushing | PTFE Composite Bearings | |
| 15 | Packing | PTFE/Flexible Graphite | |
| 16 | Gland | Carbon Steel/Stainless Steel | |
| 17 | Solenoid Valve | Aluminum Alloy | |
| 18 | Pneumatic Actuator | Aluminum Alloy | |
| 19 | Air Filter | Aluminum Alloy + Polycarbonate | |
| 20 | Limit Switch Box | Aluminum Alloy |
Dimension, Connection Size, and Actuator Model

DN | IN | Dimension | Connection Size | Actuator Model | ||||||||
| L | L1 | L2 | H2 | D | D1 | D2 | T | f | N-D | |||
| 50 | 2″ | 108 | 215/248.5 | 103.5/108 | 121/136.2 | 165 | 125 | 102 | 18 | 3 | 4-18 | HPA083DA/HPA092SR |
| 65 | 2 1/2″ | 112 | 248.5/277.5 | 108/121.5 | 136.2/154.5 | 185 | 145 | 122 | 18 | 3 | 8-18 | HPA092DA/HPA105SR |
| 80 | 3″ | 114 | 277.5/277.5 | 121.5/121.5 | 154.5/154.5 | 200 | 160 | 138 | 20 | 3 | 8-18 | HPA105DA/HPA105SR |
| 100 | 4″ | 127 | 358.3/358.3 | 142/142 | 187.6/187.6 | 220 | 180 | 158 | 20 | 3 | 8-18 | HPA125DA/HPA125SR |
| 125 | 5″ | 140 | 358.3/403.6 | 142/151 | 187.6/204.7 | 250 | 210 | 188 | 22 | 3 | 8-18 | HPA125DA/HPA140SR |
| 150 | 6″ | 140 | 403.6/468.4 | 151/174 | 204.7/230 | 285 | 240 | 212 | 22 | 3 | 8-22 | HPA140DA/HPA160SR |
| 200 | 8″ | 152 | 468.4/523.5 | 174/206 | 230/262 | 340 | 295 | 268 | 24 | 3 | 8-22/12-22 | HPA160DA/HPA190SR |
| 250 | 10″ | 165 | 523.5/539 | 206/226 | 262/287.6 | 395/405 | 350/355 | 320 | 26 | 3 | 12-22/12-26 | HPA190DA/HPA210SR |
| 300 | 12″ | 178 | 539/605.8 | 226/260 | 287.6/319.5 | 445/460 | 400/410 | 378 | 28 | 4 | 12-22/12-26 | HPA210DA/HPA240SR |
| 350 | 14″ | 190 | 605.8/719 | 260/294 | 319.5/365 | 505/520 | 460/470 | 438 | 30 | 4 | 16-22/16-26 | HPA240DA/HPA270SR |
| 400 | 16″ | 216 | 719/785 | 294/404 | 365/391 | 565/580 | 515/525 | 490 | 32 | 4 | 16-26/16-30 | HPA270DA/HPA300SR |
| 450 | 18″ | 222 | 785/920 | 404/457 | 391/440 | 615/640 | 565/585 | 550 | 40 | 4 | 20-26/20-30 | HPA300DA/HPA350SR |
| 500 | 20″ | 229 | 920/930 | 457/520 | 440/493 | 670/715 | 620/650 | 610 | 44 | 4 | 20-26/20-33 | HPA350DA/HPA350SR |
Common Applications
- Power Generation Plants (High-Pressure Steam Isolation)
- Oil and Gas (Upstream and Downstream Processing)
- Chemical and Petrochemical Facilities
- LNG and Cryogenic Services
- District Heating and High-Temperature Water Systems
- Pulp & Paper Bleaching and Processing Lines























