triple eccentric butterfly valve Manufacturer in China
triple eccentric butterfly valve The sealing surface of the valve plate and the sealing surface of the valve seat are not on the same plane. When the valve plate is closed, a wedge-shaped space is formed between the valve plate and the valve seat, enabling the valve plate to tightly seal the valve seat. Due to the eccentric design of the valve plate, it gradually separates from the valve seat during the closing process, thereby reducing the friction between the valve plate and the valve seat and lowering the torque required for opening and closing the valve.
various types of Our triple eccentric butterfly valve
The Longz welded-type bidirectional pressure-bearing butterfly valve not only adopts the conventional triple eccentric structure but, more importantly, integrates the movable seat principle of a fixed ball valve. It more effectively ensures sealing performance under reverse pressure, truly achieving 100% bidirectional pressure resistance. The valve body is fabricated from formed seamless steel pipes welded together, which more effectively addresses potential external leakage issues in cast parts. Its unique structure, innovative design, easy operation, and long service life make it stand out.
This clamp-type triple eccentric bidirectional sealing butterfly valve It adopts a triple eccentric and movable seat structure, ensuring frictionless operation of the butterfly plate during opening and closing, which effectively guarantees sealing performance under reverse pressure. This valve features a compact design, light weight, and convenient maintenance.
This flanged three-eccentric double-directional seal butterfly valve not only adopts the conventional triple-eccentric multi-layer hard-sealing structure, but more importantly, it integrates the movable seat principle of a fixed ball valve, further enhancing its performance.
It effectively ensures sealing performance under reverse pressure, truly achieving bidirectional pressure resistance
Automatic pressure relief structure of triple eccentric butterfly valve
Our Longz triple eccentric butterfly valve lifts off the seat at the initial degrees of the disc’s opening, and thereafter, only the bearings and packing on the stem need to be overcome throughout the entire stroke.Contact occurs only in the final few degrees of closure, where the third eccentric conical surface gradually rolls the butterfly plate into the valve seat—resulting in a steady establishment of sealing pressure, rather than a sudden impact.The frictional torque is low, and the torque curve is predictable without any spikes.
Your Trusted triple eccentric butterfly valve supplier in China
Longz has obtained ISO 9001 international quality management system certification, ISO 14001 environmental management system certification, API certification from the American Petroleum Institute, and other certificates confirming that its products meet domestic and international authoritative quality standards. The company also holds more than 50 invention patents and technology innovation patents.
When our Longz triple eccentric butterfly valve is opened, the disc immediately swings away from the seat: the two sealing surfaces separate within the initial degrees of travel and remain separated. When closed, the butterfly plate slides back along the conical surface and only meets the valve seat in the final few degrees, where the conical surface wedges the metal-to-metal contact tightly.The sealing force originates from this wedging effect—resulting from the compressive force between the contact surfaces—rather than from squeezing an elastomer.
The sealing faces are cut on an inclined cone, and that geometry gives you something a conventional butterfly valve cannot: a seal that works whichever way the medium flows. Upstream or downstream, the cone drives the disc into the seat the same way, so the valve installs in either orientation and needs no flow-direction check before commissioning.
Our Longz triple eccentric butterfly valve adopts a torque-sealed design: the sealing force originates from the driving torque pressing the disc into the seat along the third eccentric conical surface, rather than relying on the disc being stationary at a fixed position.
- certificate
- Size table of triple eccentric butterfly valve
| DN | L | H1 | H2 | D | D1 | D2 | n-Φd |
|---|---|---|---|---|---|---|---|
| 50 | 108 | 85 | 196 | 140 | 110 | 90 | 4-Φ14 |
| 65 | 112 | 90 | 211 | 160 | 130 | 110 | 4-Φ14 |
| 80 | 114 | 100 | 230 | 190 | 150 | 125 | 4-Φ18 |
| 100 | 127 | 107 | 256 | 210 | 170 | 145 | 4-Φ18 |
| 125 | 140 | 123 | 288 | 240 | 200 | 175 | 8-Φ18 |
| 150 | 140 | 140 | 315 | 265 | 225 | 200 | 8-Φ18 |
| 200 | 152 | 180 | 350 | 320 | 280 | 255 | 8-Φ18 |
| 250 | 165 | 200 | 398 | 375 | 335 | 310 | 12-Φ18 |
| 300 | 178 | 250 | 431 | 440 | 395 | 365 | 12-Φ22 |
| 350 | 190 | 270 | 478 | 490 | 445 | 415 | 12-Φ22 |
| 400 | 216 | 350 | 513 | 540 | 495 | 465 | 16-Φ22 |
| 450 | 222 | 365 | 550 | 595 | 550 | 520 | 16-Φ22 |
| 500 | 229 | 410 | 615 | 645 | 600 | 570 | 20-Φ22 |
| 600 | 267 | 470 | 670 | 755 | 705 | 670 | 20-Φ26 |
| 700 | 292 | 495 | 750 | 860 | 810 | 775 | 24-Φ26 |
| 800 | 318 | 575 | 820 | 975 | 920 | 880 | 24-Φ30 |
| 900 | 330 | 620 | 895 | 1075 | 1020 | 980 | 24-Φ30 |
| 1000 | 410 | 680 | 990 | 1175 | 1120 | 1080 | 28-Φ30 |
| 1200 | 470 | 790 | 1150 | 1405 | 1340 | 1295 | 32-Φ33 |
| 1400 | 530 | 870 | 1260 | 1630 | 1560 | 1510 | 36-Φ36 |
| 1600 | 600 | 1010 | 1380 | 1830 | 1760 | 1710 | 40-Φ36 |
| 1800 | 670 | 1100 | 1500 | 2045 | 1970 | 1920 | 44-Φ39 |
| 2000 | 760 | 1200 | 1600 | 2265 | 2180 | 2125 | 48-Φ42 |
| 2200 | 800 | 1310 | 1710 | 2475 | 2390 | 2335 | 52-Φ42 |
| 2400 | 850 | 1410 | 1825 | 2685 | 2600 | 2545 | 56-Φ42 |
| 2600 | 900 | 1535 | 1940 | 2905 | 2810 | 2750 | 60-Φ48 |
| 2800 | 950 | 1640 | 2060 | 3115 | 3020 | 2960 | 64-Φ48 |
| 3000 | 1000 | 1745 | 2180 | 3315 | 3220 | 3160 | 68-Φ48 |
This triple eccentric butterfly valve After more than 18 months of online service, during our first disassembly and inspection, the sealing surfaces remained intact, with no visible erosion grooves. The solid particulate matter in the medium does not scratch the sealing surfaces during the opening and closing process, significantly reducing our spare parts procurement costs and unplanned downtime losses
EngineerGazprom, RussiaAfter more than two years of operation here, this triple eccentric butterfly valve has completely eliminated the frequent sealing surface leakage issues previously encountered. This triple eccentric butterfly valve The switching torque remains stable
Procurement ManagerMaldives Gas Company.
The valve body materials for this triple eccentric butterfly valve include WCB, WC6, WC9, etc. The choice primarily depends on the specific operating conditions you require.
Triple eccentric butterfly valves (also widely known as triple offset butterfly valves or TOVs) feature a specialized geometry with three separate offsets that shift the disc and seat away from each other during operation. This advanced design gives them distinct advantages over standard concentric/double-eccentric butterfly valves, as well as traditional gate and ball valves.
The triple eccentric butterfly valve utilizes three different eccentric distances in the geometric design of the valve shaft and disc to achieve a frictionless, zero-leakage metal-to-metal seal, thereby extending the service life of the valve assembly.
Primary Principle: Always refer to the OEM (Original Equipment Manufacturer) maintenance manual as the authoritative standard.
The maintenance intervals and specific procedures for valves vary depending on the valve design, seat material, actuator, process fluid, pressure and temperature. Manufacturers recommend developing maintenance plans based on actual operating conditions, rather than rigidly applying a generic maintenance interval.
Axial eccentricity (first eccentricity), radial eccentricity (second eccentricity), and angular eccentricity (third eccentricity). Through the superposition of these three types of eccentricity, the triple-eccentric butterfly valve achieves excellent performance, including frictionless opening and closing, high sealing performance, long service life, high sealing capability, high reliability, and superior durability under high pressure and temperature conditions.
The features of this triple eccentric butterfly valve.
The sealing surface of this triple eccentric butterfly valve is made from a hard-sealing material with high hardness and excellent wear resistance. It features outstanding surface strength, effectively resisting mechanical friction and media erosion during long-term operation, providing robust protection against mechanical wear and fluid impact in continuous service. Due to the structural design that keeps the frictional torque at a low level, the wear on the sealing surface during opening and closing is further reduced, thereby significantly extending the service life of the triple eccentric butterfly valve. Its service life is extended, while also reducing the workload and cost of routine maintenance. The valve plate’s shape has been optimized through design, resulting in minimal obstruction to the flowing medium when fully open. The flow channels are unobstructed, and the flow coefficient is relatively high. Consequently, it can effectively meet the continuous transport requirements of large-volume media, thereby enhancing system operational efficiency. triple eccentric butterfly valve The overall structure is relatively simple, with all components arranged reasonably. It is compact and lightweight, occupying limited space during installation. This not only facilitates transportation and lifting but also reduces installation difficulty, making it suitable for use in space-constrained environments.