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Triple Eccentric Hard‑to‑Hard All‑Metal Butterfly Valve

Triple Eccentric Hard‑to‑Hard All‑Metal Butterfly Valve
  • Nominal Diameter: DN40‑DN600 (1.5″‑24″)
  • Nominal Pressure: PN16‑PN40 (Class 150‑Class 300)
  • Operation: Handwheel, Gear Operator
  • Body Material: WCB, WC6, WC9, 304, 316L, Hastelloy C, Alloy 20, 2205, 2507, 904L, 310S, TA2
  • Seat Material: 304+STL, 316L+STL, etc.
  • Manufacturing Standards: JB/T8527‑97, GB/T12238‑2008, ISO10631‑1994, BS EN593‑2004, MSS SP‑68, API 609
  • Flange Standards: ASME B16.5, JIS B2220, EN1092‑1, HG/T 20592
  • Operating Temperature: -29°C ~ 600°C (depending on body and seat materials)
  • Suitable Media: Steam, Superheated Steam, High‑temperature Heat‑transfer Oil, Hot Air, High‑temperature Flue Gas, Exhaust Gas, Blast‑furnace Gas, Natural Gas, Oil Products, Lubricating Oil, Media with Trace Dust
For technical drawings and 3-D models, click on a part number.

Product details

The triple‑offset hard‑to‑hard all‑metal butterfly valve is a high‑performance metal‑to‑metal hard‑seated butterfly valve. It adopts a triple‑offset structural design. The seat consists of a metal base overlaid with STL (Stellite) hard‑alloy weld layer, forming an all‑metal sealing structure with outstanding high‑temperature and wear‑resistant properties.

Compared with conventional soft‑seated butterfly valves, this design can withstand higher operating temperatures and more severe industrial working conditions. The triple‑offset geometry enables nearly friction‑free or low‑friction operation between the disc and seat during opening and closing, which greatly reduces wear on the sealing surfaces and extends the service life of the valve.

With Stellite hard‑faced overlay on the sealing face, the seat delivers excellent resistance to wear, erosion, high temperature and galling. It is suitable for high‑temperature, high‑pressure services, steam, flue gas, hot air, oil products and certain corrosive media.

Working Principle of All‑Metal‑to‑Metal Flanged Butterfly Valve：
Friction‑free Opening with Triple‑Offset Design: Driven by a handwheel or gear operator, the valve stem rotates. Thanks to the triple‑offset structure, the butterfly disc lifts completely off the Stellite (STL)‑faced seat at the initial opening angle. No contact or frictional wear occurs throughout the travel, which greatly prolongs the service life of sealing surfaces. When the disc rotates to the 90° fully‑open position, the flow passage is fully unobstructed for smooth medium flow.

Wedge‑Shaped Metal‑to‑Metal Sealing for Closure: As the valve stem rotates in the reverse direction, the disc gradually engages with the conical surface of the seat. Upon completing the closing stroke, the metal‑to‑Stellite hard sealing surfaces form a precise line‑contact wedge seal. Higher medium pressure creates tighter sealing, achieving bi‑directional bubble‑tight shut‑off and completely cutting‑off the pipeline medium.

Product Specifications

Manual butterfly valves are widely used in industrial piping systems for fast and reliable flow isolation and regulation. Key parameters including working temperature, medium, pressure rating, valve size and connection standard should be confirmed before ordering for proper valve selection. Customized valve sizes, pressure ratings, connection types, sealing materials and body materials are available for diverse industrial and non-standard applications. (Unit: mm)

API 609 Triple Offset Metal-Seated Flanged Butterfly Valve – 150LB-300LB

DNinType/ClassPart NoLDD1D2bZ-φdDoH1H
40 1.5D343-150LBD343P150XLX1.5106 127 98.5 73 15 4-15140 76 248
50 2D343-150LBD343P150XLX2108 152 120.5 92 16 4-19140 85 254
65 2.5D343-150LBD343P150XLX2.5112 178 139.5 105 18 4-19160 95 278
80 3D343-150LBD343P150XLX3114 190 152.5 127 19 4-19160 106 312
100 4D343-150LBD343P150XLX4127 229 190.5 157 24 8-19180 114 330
125 5D343-150LBD343P150XLX5140 254 216 186 24 8-22180 130 368
150 6D343-150LBD343P150XLX6140 279 241.5 216 26 8-22230 148 404
200 8D343-150LBD343P150XLX8152 343 298.5 270 29 8-22230 176 496
250 10D343-150LBD343P150XLX10165 406 362 324 31 12-25280 210 558
300 12D343-150LBD343P150XLX12178 483 432 381 32 12-25310 23B632
350 14D343-150LBD343P150XLX14190 533 476 413 35 12-29310 270 672
400 16D343-150LBD343P150XLX16216 597 540 470 37 16-29310 302 714
450 18D343-150LBD343P150XLX18222 635 578 533 40 16-32380 332 768
500 20D343-150LBD343P150XLX20229 699 635 584 43 20-32380 370 828
600 24D343-150LBD343P150XLX24267 813 749.5 692 48 20-35450 432 952
40 1.5D343-300LBD343P300XLX1.5106 156 114.5 73 21 4-22140 76 248
50 2D343-300LBD343P300XLX2108 165 127 92 23 8-19140 85 254
65 2.5D343-300LBD343P300XLX2.5112 190 149 105 26 8-22180 95 288
80 3D343-300LBD343P300XLX3114 210 168.5 127 29 8-22180 106 322
100 4D343-300LBD343P300XLX4127 254 200 157 32 8-22230 122 355
125 5D343-300LBD343P300XLX5140 279 235 186 35 8-22230 140 392
150 6D343-300LBD343P300XLX6140 318 270 216 37 12-22280 156 428
200 8D343-300LBD343P300XLX8152 381 330 270 42 12-25280 186 520
250 10D343-300LBD343P300XLX10165 445 387.5 324 48 16-29310 220 574
300 12D343-300LBD343P300XLX12178 521 451 381 51 16-32380 250 668
350 14D343-300LBD343P300XLX14190 584 514.5 413 54 20-32380 288 708
400 16D343-300LBD343P300XLX16216 648 571.5 470 58 20-35380 322 750
450 18D343-300LBD343P300XLX18222 711 628.5 533 61 24-35450 348 802
500 20D343-300LBD343P300XLX20229 775 686 584 64 24-35450 378 862
600 24D343-300LBD343P300XLX24267 914 813 692 70 24-41560 434 1006

The all‑metal‑to‑metal butterfly valve can be supplied with carbon steel, stainless steel, alloy steel and other valve‑body materials to suit different working conditions. Designed with triple‑offset geometry and an all‑metal hard‑sealed structure, its seat is hard‑faced with Stellite (STL) overlay. It features low friction and low wear, making it suitable for high‑temperature, high‑pressure and severe‑service applications. The valve can be fitted with manual, gear, electric or pneumatic actuators. It is widely used in petroleum, chemical, power generation, metallurgy, iron‑and‑steel, heating and energy industries.