The DN600 (24 inch) size is a critical breakpoint in butterfly valve engineering. At this diameter, the choice of body style directly affects installation cost, operational reliability, and maintenance access. A double flange (EN 558-1 Series 13) body provides:
EN 558-1 is the European standard defining face-to-face and end-to-end dimensions for metal valves. It is functionally equivalent to ISO 5752 and is referenced throughout EN, DIN, and BS piping specifications. The standard divides valves into basic series, each defining a specific face-to-face length for each nominal diameter.
Series 13 is designated for double flanged butterfly valves — the long-pattern configuration. For DN600, the Series 13 face-to-face dimension is 267 mm. For comparison, the same DN600 valve in a short-pattern wafer or lug configuration (Series 20) would be approximately 152 mm. The additional 115 mm of body length accommodates the full flange face, bolt circle, and raised face on each end.
| Series | Valve Type | DN600 Face-to-Face | Typical Application |
|---|---|---|---|
| EN 558-1 Series 20 | Wafer / Lug butterfly valve (short pattern) | 152 mm | Compact installations, skid-mounted equipment |
| EN 558-1 Series 13 | Double flange butterfly valve (long pattern) | 267 mm | Buried service, end-of-line, standard flanged piping |
| EN 558-1 Series 14 | Double flange butterfly valve (extra-long) | 318 mm | High-pressure, large-diameter, special applications |
Standard butterfly valves for waterworks use a bare ductile iron disc — the body seat (rubber) provides sealing, and the disc is simply the closure member. This is adequate for clean, chlorinated drinking water. However, in applications with aggressive or variable water chemistry, the bare ductile iron disc face becomes a corrosion liability:
The fusion-bonded epoxy (FBE) coating on the disc eliminates all of these failure modes. The coating process is:
The resulting coating provides:
| Item | PN10 | PN16 | Class 150 |
|---|---|---|---|
| Nominal Size | DN600 | DN600 | 24 inch |
| Face-to-Face (EN 558-1 Series 13) | 267 mm | 267 mm | 267 mm |
| Flange Outer Diameter | 780 mm | 780 mm | 815 mm |
| Bolt Circle Diameter | 725 mm | 725 mm | 749 mm |
| Number of Bolts | 20 | 20 | 20 |
| Bolt Size | M27 | M33 | 1-1/4" UN |
| Raised Face Diameter | 690 mm | 690 mm | — |
| Raised Face Height | 2 mm | 2 mm | 2 mm |
| Body Length (flange edge to edge) | 267 mm | 267 mm | 267 mm |
| Approximate Weight (bare valve) | ~290 kg | ~310 kg | ~350 kg |
| Top Flange (ISO 5211) | F14 | F14 | F14 |
| Pressure Class | Shell Test Pressure | Seat Test Pressure | Maximum Operating Pressure at 20°C |
|---|---|---|---|
| PN10 | 15 bar | 11 bar | 10 bar (145 psi) |
| PN16 | 24 bar | 17.6 bar | 16 bar (232 psi) |
| Class 150 | 30 bar | 22 bar | 19.6 bar (285 psi) |
| Seat Material | Temperature Range | Recommended Media |
|---|---|---|
| EPDM | 0°C to +80°C | Treated drinking water, raw surface water, cooling water (EPDM is NSF/ANSI 61 certified) |
| NBR | -10°C to +80°C | Wastewater, reclaimed water, water with trace hydrocarbons or oils |
| Item | Material | Standard |
|---|---|---|
| Body | Ductile iron GJS-400-15 / ASTM A536 Grade 65-45-12 | EN 1563 / ASTM A536 |
| Body Coating | Fusion-bonded epoxy, 250+ µm (internal and external) | AWWA C550 / EN 14901 |
| Disc | Ductile iron GJS-400-15 with 250+ µm fusion-bonded epoxy coating | EN 1563 + FBE |
| Seat | EPDM (standard) / NBR | EN 681-1 / AWWA C504 |
| Seat Retaining Ring | SS316 (1.4401) | EN 10088-3 |
| Shaft (One-Piece) | SS316 (1.4401) / optional 17-4PH (1.4542) | EN 10088-3 |
| Shaft Bearings | PTFE-lined DU bushing (upper and lower) | — |
| Shaft Seal | EPDM O-ring + PTFE V-ring set | — |
| Internal Fasteners | SS316 (1.4401) | EN 10088-3 |
The DN600 valve body incorporates an ISO 5211 F14 top mounting flange (140 mm bolt circle, 4 × M16 bolts) for direct actuator coupling. The square drive output matches standard ISO 5211 drive inserts. Supported actuator configurations include:
| Actuator Type | Typical Model for DN600 PN10 | Power Requirements |
|---|---|---|
| Manual Gear Operator | Worm gearbox, 6:1 reduction ratio, with position indicator and mechanical travel stops | Manual (handwheel) |
| Electric Actuator (On/Off) | Multi-turn or part-turn, 1,500-2,500 Nm output, IP68 enclosure for buried service | 3-phase 380-480V AC or 1-phase 220V AC |
| Electric Actuator (Modulating) | Part-turn with 4-20 mA positioning, 2,500-4,000 Nm output, Class D continuous modulation | 3-phase 380-480V AC |
| Hydraulic Cylinder | Double-acting cylinder with manual override hand pump | Hydraulic power unit (separate) |
| Pneumatic Actuator | Scotch-yoke, double-acting, 6,000-10,000 Nm at 6 bar air supply | Instrument air 6 bar |
| Operating Condition | PN10 (Nm) | PN16 (Nm) | Class 150 (Nm) |
|---|---|---|---|
| Breakaway torque (zero delta-P, clean water, EPDM seat) | 680 | 740 | 790 |
| Breakaway torque (max delta-P at rating) | 1,350 | 1,580 | 1,720 |
| Running torque (mid-stroke, flowing) | 450 | 510 | 560 |
| Re-seating torque (final closing against pressure) | 1,100 | 1,280 | 1,400 |
| Maximum allowable stem torque | 2,800 | 2,800 | 2,800 |
| Industry | Application | Typical Configuration |
|---|---|---|
| Municipal Water Supply | Transmission main isolation, treatment plant inlet/outlet | PN10, EPDM seat, epoxy disc, gear operator or electric actuator |
| Wastewater Treatment | Influent channel isolation, aeration basin inlet, RAS/WAS lines | PN10, NBR seat, epoxy disc, electric actuator (IP68) |
| Cooling Water (Power Plants) | Condenser isolation, cooling tower supply/return headers | PN16, EPDM seat, epoxy disc, electric or hydraulic actuator |
| Raw Water Intake | Pump suction isolation, intake structure shutoff | PN10, EPDM seat, epoxy disc, gear operator with extension stem |
| Desalination Plants | Seawater intake, brine discharge, RO feed isolation | PN16, EPDM seat, epoxy disc, SS316 fasteners throughout |
| Irrigation & Water Transfer | Main canal gates, pump station headers | PN10, EPDM seat, epoxy disc, gear operator or electric actuator |
Each DN600 EN 558-1 Series 13 valve undergoes the following tests before release:
267 mm. This is the standard long-pattern face-to-face for double flanged butterfly valves per EN 558-1 Series 13. Always verify your existing pipe gap before ordering. If you are replacing an AWWA C504 long-body valve, the face-to-face may differ — measure first.
The epoxy coating provides a continuous dielectric barrier that prevents corrosion of the ductile iron disc. In raw water, wastewater, cooling water, and brackish applications, a bare iron disc will develop pitting corrosion within 1-3 years. The epoxy coating extends disc service life to 15-25+ years. The cost premium is approximately 10-15%, which is negligible compared to the cost of an unplanned DN600 valve replacement.
Yes. The EPDM or NBR seat is held in place by a bolted SS316 retaining ring. By removing the retaining ring bolts, the seat can be extracted and a new seat inserted — all with the valve body remaining bolted between the pipe flanges. This is a critical feature for buried valves where excavation to remove the entire valve body is cost-prohibitive.
Series 13 is the long-pattern face-to-face for double flanged butterfly valves (267 mm at DN600). Series 20 is the short pattern for wafer and lug butterfly valves (152 mm at DN600). The longer Series 13 body accommodates the full raised-face flanges on both ends. For a detailed comparison of body styles, see our wafer vs lug vs double flange guide.
Yes. The ISO 5211 F14 top flange supports direct mounting of electric actuators rated at 1,500-4,000 Nm depending on service conditions. For modulating (4-20 mA) control, specify a continuous-rated modulating actuator with a minimum 1.5 safety factor. Actuators are factory-mounted and stroke-tested before shipment.
Yes. We use NSF/ANSI 61 certified fusion-bonded epoxy powder for drinking water applications. The coating is applied and cured per the epoxy manufacturer's certified procedure. NSF 61 certificates are available with the material test documentation.
Standard drilling is EN 1092-2 (PN10/PN16) or ANSI B16.1 Class 125 (Class 150). Custom drilling to BS 4504, JIS B2220, AS 2129, or AWWA C207 is available on request. When ordering, always specify both the pressure rating AND the flange drilling standard — these are not the same thing.
Standard configuration valves (PN10, EPDM seat, epoxy disc, gear operator) are typically stocked and ship within 2-3 weeks. Custom configurations (special drilling, NBR seat, electric actuator) typically ship in 6-8 weeks. Contact our sales team for current stock availability and confirmed delivery dates.
From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.
