Features of EN558-14 Double Offset Butterfly Valve
- Compliant with EN 558 Series 14 (Long Face-to-Face Dimension): The extended face-to-face dimension facilitates replacement in piping systems originally designed for Series 14 flanged butterfly valves. Please verify the nominal size and flange drilling specifications before placing an order.
- Double-Eccentric Disc Design: The eccentric shaft configuration allows the disc to quickly disengage from the seat during the opening process, minimizing friction between the two components throughout the majority of the operating stroke.
- Double-Flanged Connection: The integrated flanges ensure a secure, bolted connection to adjacent piping. Flange dimensions can be customized to meet specific project requirements.
- Reduced Seat Wear: Decreased contact between the disc and the seat during operation helps minimize wear caused by friction—a significant advantage in applications requiring frequent opening and closing cycles.
- Sealing Solutions Tailored to Specific Operating Conditions: Appropriate seat materials and sealing configurations can be selected based on the medium, operating temperature, and differential pressure conditions.
Parts Material Options of Double Offset Butterfly Valve
| ITEM | Standard |
|---|---|
| Nominal Diameter Range | DN100-DN2000 |
| Design | EN593 | API609 |
| Face to Face | EN558-14 | ISO5752 | API608 | BS5155-4 |
| Top Flange | ISO5211 |
| Flange Drilling | PN6 | PN10 | PN16 | ASME B16.5 CL150 | JIS 10K |
| Pressure Rating | PN6 | PN10 | PN16 | PN25 | CL150 | JIS 10K |
| Tightness Test | ISO5208 | API598 | EN12266-1 |
EN558-14 Double Offset Butterfly Valve Parts Material
| Parts | Ductile Iron type | WCB type | Stainless Steel Type (HP) | Duplex Stainless Steel Type (HP) |
|---|---|---|---|---|
| Body | Ductile Iron(GGG40/50) | A216 A217 A105(forged) |
SS304/ CF8 SS316/CF8M SS304L/CF3 SS316L/CF3M |
2205 2507 1.4529 |
| Disc | Ductile Iron with Epoxy Spray Coating Stainless Steel Duplex Stainless Steel |
SS304/ CF8 SS316/CF8M SS304L/CF3 SS316L/CF3M 2205 2507 1.4529 |
2205 2507 1.4529 |
|
| Seat | NBR, EPDM, Viton, Hypalon, Silicon, PFA, PTFE | |||
| Stem | SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel | Duplex Stainless Steel, Monel | ||
| Actuator | Worm Gear, Electric, Pneumatic | |||
Parameters of Long Pattern Double Eccentric Butterfly Valve
DN100-DN1200
| DN | L | A | B | PN10 | PN16 | Ø1 | Ø2 | N-M | Ø3 | Ø4 | E | F | K | key | R° | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| D | D1 | D2 | n-Ø | D | D1 | D2 | n-Ø | ||||||||||||||
| 100 | 190 | 125 | 224 | 220 | 180 | 158 | 8-19 | 220 | 180 | 158 | 8-19 | 90 | 70 | 4-10 | 55 | 16 | 39 | 30 | 5 | 1 | 45° |
| 125 | 200 | 156 | 266 | 250 | 210 | 184 | 8-19 | 250 | 210 | 184 | 8-19 | 90 | 70 | 4-10 | 55 | 16 | 39 | 30 | 5 | 1 | 45° |
| 150 | 210 | 168 | 283 | 285 | 240 | 212 | 8-23 | 285 | 240 | 212 | 8-23 | 125 | 102 | 4-12 | 70 | 20 | 47 | 35 | 6 | 1 | 90° |
| 200 | 230 | 220 | 311 | 340 | 295 | 268 | 8-23 | 340 | 295 | 268 | 12-23 | 125 | 102 | 4-12 | 70 | 25 | 47 | 35 | 8 | 1 | 90° |
| 250 | 250 | 224 | 364 | 395 | 350 | 320 | 12-23 | 405 | 355 | 320 | 12-28 | 175 | 140 | 4-18 | 100 | 30 | 50 | 45 | 8 | 1 | 90° |
| 300 | 270 | 280 | 430 | 445 | 400 | 370 | 12-23 | 460 | 410 | 370 | 12-28 | 210 | 165 | 4-22 | 130 | 34 | 50 | 45 | 10 | 1 | 90° |
| 350 | 290 | 315 | 450 | 505 | 460 | 430 | 16-23 | 520 | 470 | 430 | 16-28 | 210 | 165 | 4-22 | 130 | 40 | 50 | 45 | 12 | 1 | 90° |
| 400 | 310 | 333 | 484 | 565 | 515 | 482 | 16-28 | 580 | 525 | 482 | 16-31 | 210 | 165 | 4-22 | 130 | 45 | 50 | 45 | 14 | 1 | 90° |
| 450 | 330 | 380 | 525 | 615 | 565 | 532 | 20-28 | 640 | 585 | 548 | 20-31 | 210 | 165 | 4-22 | 130 | 45 | 50 | 45 | 14 | 1 | 90° |
| 500 | 350 | 428 | 550 | 670 | 620 | 585 | 20-28 | 715 | 650 | 609 | 20-34 | 210 | 165 | 4-22 | 130 | 52 | 70 | 60 | 16 | 1 | 90° |
| 600 | 390 | 448 | 640 | 780 | 725 | 685 | 20-31 | 840 | 770 | 720 | 20-37 | 300 | 254 | 8-18 | 200 | 55 | 90 | 70 | 16 | 2 | 22.5° |
| 700 | 430 | 500 | 698 | 895 | 840 | 800 | 24-31 | 910 | 840 | 794 | 24-37 | 300 | 254 | 8-18 | 200 | 65 | 90 | 70 | 18 | 2 | 22.5° |
| 800 | 470 | 595 | 744 | 1015 | 950 | 905 | 24-34 | 1025 | 950 | 901 | 24-40 | 300 | 254 | 8-18 | 200 | 70 | 100 | 80 | 2 | 2 | 22.5° |
| 900 | 510 | 635 | 780 | 1115 | 1050 | 1005 | 28-34 | 1125 | 1050 | 1001 | 28-40 | 300 | 254 | 8-18 | 200 | 80 | 100 | 80 | 22 | 2 | 22.5° |
| 1000 | 550 | 708 | 905 | 1230 | 1160 | 1110 | 28-37 | 1255 | 1170 | 1112 | 28-43 | 350 | 298 | 8-22 | 230 | 92 | 146 | 130 | 25 | 2 | 22.5° |
| 1200 | 630 | 820 | 1018 | 1455 | 1380 | 1330 | 32-40 | 1485 | 1390 | 1328 | 32-49 | 350 | 298 | 8-22 | 230 | 100 | 146 | 130 | 28 | 2 | 22.5° |
DN1400-DN2000
| DN | L | A | B | PN10 | PN16 | Ø1 | Ø2 | N-M | Ø3 | Ø4 | E | F | K | key | R° | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| D | D1 | D2 | n-Ø | D | D1 | D2 | n-Ø | ||||||||||||||
| DN1400 | 710 | 1082 | 1246 | 1675 | 1590 | 1530 | 36-43 | 1685 | 1590 | 1530 | 36-49 | 415 | 356 | 8-33 | 260 | 130 | 230 | 180 | 32 | 2 | 22.5° |
| DN1600 | 790 | 1220 | 1376 | 1915 | 1820 | 1750 | 40-49 | 1930 | 1820 | 1750 | 40-56 | 415 | 356 | 8-33 | 260 | 140 | 230 | 200 | 36 | 2 | 22.5° |
| DN1800 | 870 | 1336 | 1490 | 2115 | 2020 | 1950 | 44-49 | 2130 | 2020 | 1950 | 44-56 | 475 | 406 | 8-39 | 300 | 160 | 250 | 230 | 40 | 2 | 22.5° |
| DN2000 | 950 | 1580 | 1608 | 2325 | 2230 | 2150 | 48-49 | 2345 | 2230 | 2150 | 48-62 | 560 | 483 | 12-39 | 370 | 180 | 250 | 230 | 45 | 2 | 15° |
Manufacture Process of ZFA Butterfly Valve Manufacturer
Certificates of Zfa Valve
WRAS
CE
ISO 9001
EAC Russia
FAQ of EN558-14 Double Eccentric Valve
1. Do double-eccentric butterfly valves offer bi-directional sealing capability?
Not all double-eccentric butterfly valves provide the same shut-off performance in both directions. Their ability to withstand reverse pressure depends on the seat design, the method of securing the seal, and the valve size. For piping systems where backflow may occur, the maximum pressure differential in each direction should be specified, and seat test results covering both directions should be requested. If bi-directional sealing is required, we can provide customized solutions; in such cases, the valve body will be marked with a “bi-directional flow” arrow.
2. Are EN 558 Series 13 and Series 14 butterfly valves interchangeable?
Generally, they are not directly interchangeable because, for the same nominal size, the two series have different face-to-face dimensions (overall lengths). Replacing one series with the other may require adjustments to the piping layout or connecting components. Before placing an order, always compare the actual face-to-face dimensions (overall lengths) shown on the drawings for both valves.
3. Can a double-flanged butterfly valve be used at the end of a pipeline (i.e., with no downstream piping connected)?
This depends on whether the specific valve model is approved for such operating conditions. A double-flanged design does not automatically mean the valve is suitable for use without downstream piping. If a valve is to be installed at the end of a pipeline, it must be verified that it meets all relevant requirements, including those concerning valve size, pressure direction, maximum pressure differential, and the method of securing the seal. Please explicitly state this requirement when requesting a quote and obtain written confirmation regarding the permitted operating conditions.
4. Can this type of double-eccentric butterfly valve be used for throttling or flow regulation?
If a valve is intended for throttling or flow regulation, an application assessment is required. Valves designed specifically for shut-off purposes may not be suitable for continuous flow regulation. Please provide relevant parameters, such as minimum and maximum flow rates, upstream and downstream pressures, and the temperature of the medium. Operating a valve in a position near full closure for extended periods can expose the sealing area to localized high-velocity flow, leading to accelerated wear. For throttling applications, we generally recommend the use of high-performance butterfly valves.
5. Can any two EN 558 Series 14 butterfly valves be used in the same installation location?
Matching nominal size and the Series 14 face-to-face dimension is only a preliminary check. Differences may still exist regarding flange drilling, flange sealing surface types, disc clearance, valve shaft height, and gearbox dimensions. When performing a replacement, always compare the verified general assembly drawings and ensure there is sufficient space for the handwheel, actuator, and maintenance operations.
6. What information should I provide when ordering an EN 558 Series 14 butterfly valve as a replacement?
Please provide the nominal size of the existing valve, its measured face-to-face dimension, flange standard, pressure rating, and a photograph of the nameplate. Additionally, specify the medium, temperature, maximum shut-off pressure differential, and the required operating orientation. Providing installation drawings or on-site photographs will help confirm whether there are any space constraints prior to production.
