Language

English

Deutsch

Back

English

Get a Quote

Home > Products > All Collections > Double Flange Butterfly Valve > DN600 EN 558-1 Series 13 Double Flange Butterfly Valve with Epoxy Coated Disc

DN600 EN 558-1 Series 13 Double Flange Butterfly Valve with Epoxy Coated Disc

Name: DN600 EN 558-1 Series 13 Double Flange Butterfly Valve with Epoxy Coated Disc
Brand: Laux Valve - Professional Butterfly Valve Manufacturer

The DN600 (24 inch) EN 558-1 Series 13 double flange butterfly valve combines a robust long-pattern flanged body with a fusion-bonded epoxy coated disc for superior corrosion protection in water, wastewater, and industrial media. Featuring a full rubber-lined body seat, SS316 shaft, and ISO 5211 actuator mounting, this valve delivers bubble-tight bidirectional shutoff and decades of reliable service in large-diameter pipeline isolation applications.

Size

DN50-DN2400

Flange

PN6/PN10/PN16/150LB/10K

Design

EN558/API609/BS5155/EN1092

Mounting Flange

ISO 5211

Testing Standard

API598 ISO5208 EN12266-1

Description
Quality Assurance

Why Specify a DN600 Double Flange Butterfly Valve

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:

Full bidirectional pressure rating in end-of-line service — unlike wafer or lug valves, the flanged body holds full rated pressure with a blind flange on one side, critical for tank isolation and future expansion stubs
Self-centering installation — the raised-face flange pilot automatically aligns the valve with the pipe flanges, eliminating the bolt-circle alignment challenges common with large-diameter wafer valves
Maximum joint rigidity — the extended Series 13 face-to-face and full flange bolting distribute pipe loads and bending moments across a larger structural section, essential for buried valve vaults and above-ground pipe racks with thermal expansion
Gasket compatibility — full-face or spiral-wound gaskets can be used on both sides, matching standard flanged valve installation procedures

EN 558-1 Series 13 Face-to-Face — What It Means

Understanding the Face-to-Face Standard

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

Interchangeability note: If you are replacing an existing double flange butterfly valve, always measure the installed face-to-face before ordering. Some manufacturers produced non-standard lengths before EN 558-1 was universally adopted, and some AWWA C504 long-body valves have different face-to-face dimensions than EN 558-1 Series 13. Confirm your existing valve's dimensions or provide the make and model for cross-reference.

Epoxy Coated Disc — Technical Details

Why Specify Epoxy Coating on the Disc?

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:

Raw surface water with seasonal turbidity, dissolved oxygen variation, and biological activity creates localized pitting on bare iron
Treated wastewater effluent contains residual chemicals, chlorides, and sulfates that accelerate iron corrosion
Brackish water and estuary intakes have chloride levels that attack ductile iron within months
Alternating wet-dry service (e.g. reservoir drain valves that sit drained for months) produces severe atmospheric corrosion on the exposed disc face

The fusion-bonded epoxy (FBE) coating on the disc eliminates all of these failure modes. The coating process is:

The ductile iron disc is grit-blasted to SA 2.5 (near-white metal) with a minimum 75 µm anchor profile
The disc is preheated to 200-230°C in a controlled oven
Electrostatically charged epoxy powder is sprayed onto the hot disc surface; the powder melts, flows, and cross-links on contact
The disc is post-cured to achieve full cross-link density and chemical resistance
Final dry film thickness is measured at 6 points across both disc faces, the disc edge, and the hub — minimum 250 µm (10 mils) at every measurement point
A 1,500V DC holiday (spark) test confirms zero pinholes in the coating

The resulting coating provides:

Dielectric barrier: Electrically insulates the disc from the process medium, preventing galvanic corrosion between the ductile iron disc and the SS316 shaft or seat retaining ring
Chemical resistance: Resists dilute acids, alkalis, chlorides, and sulfates at concentrations typical in raw water and wastewater
Mechanical durability: Withstands impingement from suspended solids and grit without chipping or delamination
Hygienic surface: Smooth, non-porous surface resists biofilm attachment and is compatible with drinking water (NSF/ANSI 61 certified epoxy)

Cost-benefit of epoxy coated disc: The coating adds approximately 10-15% to the valve cost but typically doubles the service life of the disc in aggressive water applications. When factoring in the cost of pipeline shutdown, excavation, and crane lift for a DN600 valve replacement, the coating pays for itself many times over. For critical isolation valves where unplanned shutdown is not acceptable, an epoxy coated disc is strongly recommended.

Technical Specifications — DN600 EN 558-1 Series 13

Dimensional Data

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

Flange drilling compatibility: The PN10 and PN16 flanges are drilled to EN 1092-2. The Class 150 flanges are drilled to ANSI B16.1 Class 125 / ANSI B16.5 Class 150. Custom drilling to BS 4504, JIS B2220, AS 2129, or AWWA C207 is available on request. When ordering, always specify the mating pipe flange standard to ensure bolt-hole alignment.

Pressure & Temperature Ratings

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

Materials of Construction

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

Actuator Mounting — ISO 5211 F14 Top Flange

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

Factory-mounted and tested: When ordered with an actuator, the complete assembly is factory-mounted, stroke-tested through full open-close, and shipped as a single unit. All mounting brackets and drive couplings are machined in-house for precise fit. Refer to our ISO 5211 Mounting Guide for detailed flange dimension tables and torque pairing across all sizes.

DN600 Torque and Operation Data

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

Actuator sizing recommendation: Apply a minimum 1.3 safety factor to the breakaway torque at maximum differential pressure. For modulating service, apply a 1.5 safety factor. For buried valves where actuator replacement is difficult, apply a 1.5 safety factor regardless of service type. Example: PN10 modulating service = 1,350 Nm × 1.5 = 2,025 Nm minimum actuator sizing torque.

Typical Applications for DN600 Double Flange Butterfly Valve

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

Quality Assurance and Testing

Each DN600 EN 558-1 Series 13 valve undergoes the following tests before release:

Shell hydrostatic test: 1.5 × rated pressure, held for minimum 5 minutes, zero leakage through body wall, flange joints, or shaft bore
Seat leakage test: 1.1 × rated pressure in both flow directions, zero visible leakage per EN 12266-1 Rate A (bubble-tight criteria)
Disc coating inspection: Dry film thickness measured at 6 positions per disc face; 1,500V DC holiday detection over the entire coated surface
Body coating inspection: DFT measurement at 6 points; 1,500V holiday detection
Dimensional verification: Face-to-face, flange OD, bolt circle, bolt hole diameter, raised face height, and top flange drilling checked against the engineering drawing
Operational test: Full open-close cycle at low differential pressure to verify smooth disc rotation, zero seat scuffing, and correct travel stop settings

Installation Considerations for DN600

Lifting: The bare valve weighs approximately 290-350 kg. Use a crane or hoist with soft slings around the body (never lift by the actuator, handwheel, or shaft). Verify lifting point ratings before rigging.
Pipe alignment: The DN600 flange bolt circle must be aligned to within ±1.5 mm of the pipe flange bolt circle. Misalignment at this diameter can preload the body and cause seat distortion.
Gasket selection: Use full-face EPDM gaskets (3 mm thick) for flat-face flanges or ring gaskets for raised-face. Never use a gasket with an ID smaller than the valve bore — it will interfere with the disc.
Bolt torque: Tighten flange bolts in a star pattern in two passes (50%, then 100%). Recommended torque values: M27 = 200-240 Nm, M33 = 380-420 Nm. Use a calibrated torque wrench.
Disc position during installation: Keep the disc in the partially open position (~10°) during bolt-up to prevent the disc edge from contacting the gasket or pipe flange ID.
Buried installation: For buried service, apply a petrolatum tape or heat-shrink sleeve over the entire valve body, extending 150 mm onto the pipe coating on each side. The extension stem must be protected with a casing pipe. The valve box or floor box must be installed plumb and supported independently of the valve.

NOTE:

*The shaf end can be doubl D and key connecton. From DN700 and above, the shaf end is double key type.

*The ﬂange connecton of the above table can be DIN2501 PN16, ASME B16.47-A 125/150LB, BS4504 PN10/PN16, JIS 10K,Table D ,Table E

FAQ

What face-to-face dimension does a DN600 EN 558-1 Series 13 valve have?

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.

Why choose epoxy coated disc over a bare ductile iron disc?

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.

Is the seat replaceable without removing the valve from the pipeline?

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.

What is the difference between EN 558-1 Series 13 and Series 20?

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.

Can this valve be automated with an electric actuator?

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.

Is the epoxy coated disc compatible with drinking water?

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.

What flange drilling standards are available?

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.

What is the lead time for a DN600 valve with epoxy coated disc?

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.

Butterfly Valve Manufacturing Process
From Technical Confirmation to Final Delivery

Standardized Quality Control Process

From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.