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Manual Flanged Butterfly Valve with Locking Device | Hard-Seated Butterfly Valve

Manual Flanged Butterfly Valve with Locking Device | Hard-Seated Butterfly Valve
  • Nominal Diameter: DN40‑DN600 (1.5″‑24″)
  • Nominal Pressure: PN16‑PN40 (Class 150‑Class 300)
  • Operation: Handwheel, Gear Operator (with locking device)
  • Body Material: WCB, WC6, 304, 316L, Hastelloy‑C, Alloy 20, 2205, 2507, 904L, 310S, TA2
  • Seat Material: Metal‑to‑Metal Seal
  • 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: Petroleum, Natural Gas, Superheated Steam, High‑temperature Heat‑transfer Oil, Hot Air, High‑temperature Flue Gas, Lubricating Oil, Heat‑transfer Oil, Acid, Alkali and Salt Solutions
For technical drawings and 3-D models, click on a part number.

Product details

Manual Hard‑Seated Flanged Butterfly Valve with Locking Device is a manually‑operated, flanged‑connected butterfly valve with metal‑to‑metal sealing structure. It is suitable for industrial pipeline systems requiring reliable shut‑off and fixed disc position retention.The valve stem is rotated by a lever or handwheel, driving the butterfly disc to swing within 0°‑90°, so as to realize opening, closing and flow regulation of pipeline media.

Equipped with a locking device, the valve can lock the actuator at fully‑open, fully‑closed or any intermediate position. It prevents unintended position change caused by mis‑operation, vibration or other external factors.The hard‑seated seat delivers excellent high‑temperature resistance, wear resistance and pressure resistance, and is applicable for industrial services including water, steam, oil products, gas and some corrosive media.

Working Principle of Manual Hard‑Seated Flanged Butterfly Valve with Locking Device：
Opening:  Rotate the lever/handwheel clockwise or counter‑clockwise. The valve stem drives the butterfly disc to a position substantially parallel to the pipeline axis, fully opening the flow passage for smooth media flow.

Closing:  Operate the actuator in the reverse direction to rotate the butterfly disc to a position substantially perpendicular to the pipeline axis. The disc presses tightly against the hard‑seated seat to cut off the media flow.

Throttling: Keep the butterfly disc at an intermediate opening position. The pipeline flow can be adjusted to a certain extent by changing the angle between the disc and the media flow direction.

Locking:  Once the valve reaches the desired opening, secure the operating lever or valve stem via the locking device. This prevents unintended rotation caused by accidental impact, vibration or changes in pipeline operating conditions, so as to maintain a stable valve position.

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)

Manual Hard-Seated Flanged Butterfly Valve with Locking Device – 150LB-300LB

DNinType/ClassPart NoLDD1D2bZ-φdH1H
40 1.5SD343-150LBSD343P150XLX1.5106 127 98.5 73 15 4-1576 248
50 2SD343-150LBSD343P150XLX2108 152 120.5 92 16 4-1985 254
65 2.5SD343-150LBSD343P150XLX2.5112 178 139.5 105 18 4-1995 278
80 3SD343-150LBSD343P150XLX3114 190 152.5 127 19 4-19106 312
100 4SD343-150LBSD343P150XLX4127 229 190.5 157 24 8-19114 330
125 5SD343-150LBSD343P150XLX5140 254 216 186 24 8-22130 368
150 6SD343-150LBSD343P150XLX6140 279 241.5 216 26 8-22148 404
200 8SD343-150LBSD343P150XLX8152 343 298.5 270 29 8-22176 496
250 10SD343-150LBSD343P150XLX10165 406 362 324 31 12-25210 558
300 12SD343-150LBSD343P150XLX12178 483 432 381 32 12-2523B632
350 14SD343-150LBSD343P150XLX14190 533 476 413 35 12-29270 672
400 16SD343-150LBSD343P150XLX16216 597 540 470 37 16-29302 714
450 18SD343-150LBSD343P150XLX18222 635 578 533 40 16-32332 768
500 20SD343-150LBSD343P150XLX20229 699 635 584 43 20-32370 828
600 24SD343-150LBSD343P150XLX24267 813 749.5 692 48 20-35432 952
40 1.5SD343-300LBSD343P300XLX1.5106 156 114.5 73 21 4-2276 248
50 2SD343-300LBSD343P300XLX2108 165 127 92 23 8-1985 254
65 2.5SD343-300LBSD343P300XLX2.5112 190 149 105 26 8-2295 288
80 3SD343-300LBSD343P300XLX3114 210 168.5 127 29 8-22106 322
100 4SD343-300LBSD343P300XLX4127 254 200 157 32 8-22122 355
125 5SD343-300LBSD343P300XLX5140 279 235 186 35 8-22140 392
150 6SD343-300LBSD343P300XLX6140 318 270 216 37 12-22156 428
200 8SD343-300LBSD343P300XLX8152 381 330 270 42 12-25186 520
250 10SD343-300LBSD343P300XLX10165 445 387.5 324 48 16-29220 574
300 12SD343-300LBSD343P300XLX12178 521 451 381 51 16-32250 668
350 14SD343-300LBSD343P300XLX14190 584 514.5 413 54 20-32288 708
400 16SD343-300LBSD343P300XLX16216 648 571.5 470 58 20-35322 750
450 18SD343-300LBSD343P300XLX18222 711 628.5 533 61 24-35348 802
500 20SD343-300LBSD343P300XLX20229 775 686 584 64 24-35378 862
600 24SD343-300LBSD343P300XLX24267 914 813 692 70 24-41434 1006

The manual hard‑seated flanged butterfly valve with locking device features robust construction, reliable sealing, excellent resistance to high temperature, pressure and wear. It enables precise shut‑off and flow regulation of media. The locking device effectively prevents valve displacement caused by vibration and mis‑operation, ensuring long‑term stable and safe operation of pipelines. It is widely used in petroleum, chemical, power, metallurgy, heating, water‑treatment and industrial pipeline systems.