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Concentric Double Flange Vulcanized Seat AWWA C504 Butterfly Valve
AWWA C504 Butterfly Valve
Home > Products > All Collections > AWWA C504 Butterfly Valve

AWWA C504 Butterfly Valve OEM Factory

Laux Valve manufacturesAWWA C504 Butterfly Valvesfor municipal water supply, wastewater treatment, pumping stations, and large-diameter transmission pipelines. Designed in accordance with theAmerican Water Works Association (AWWA C504)standard, our butterfly valves provide dependable bubble-tight sealing, low operating torque, and long service life. We offer two product series to meet different project requirements:Concentric Double Flange Vulcanized Seat Butterfly ValvesandDouble Eccentric Butterfly Valves , available with manual, electric, or pneumatic actuation.
AWWA C504 Butterfly Valve OEM Manufacturer
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AWWA C504 Butterfly Valve

Specialized in waterworks valve production for over 15 years, Laux Valve supplies fully AWWA C504 certified rubber seated butterfly valves for North American municipal water distribution and wastewater treatment systems.

Our AWWA C504 butterfly valves range from 3" to 60", with Class 125–250 pressure ratings and Concentric double  flange and  Double Eccentric Flange type choices. Featuring zero-leak rubber sealing and epoxy coated ductile iron construction, they support reliable isolation and flow regulation for potable water pipelines. Custom OEM & ODM service and matched manual/electric actuators are offered for global water engineering contractors.

10" AWWA C504 Concentric Double Flange Butterfly Valve – Waterworks Grade Flow Control

10" AWWA C504 Concentric Double Flange Butterfly Valve – Waterworks Grade Flow Control
AWWA C504 Seat on Body Double Flange Butterfly Valve — Class 125, Vulcanized Seat, Flat Face

AWWA C504 Seat on Body Double Flange Butterfly Valve — Class 125, Vulcanized Seat, Flat Face
AWWA C504 Rubber Seated Butterfly Valve

AWWA C504 Rubber Seated Butterfly Valve

AWWA C504 Concentric Double Flange Butterfly Valve with Vulcanized Seat — Flat Face

The concentric butterfly valve is the classic AWWA C504 configuration and the most widely installed butterfly valve type in municipal waterworks. In this design, the shaft centerline, disc centerline, and pipe bore centerline all intersect at a single point — the shaft passes directly through the center of the disc and the center of the seat. This symmetrical geometry produces full 360-degree circumferential seat contact throughout the entire closing stroke.

The defining feature of this variant is the vulcanized rubber seat bonded directly to the body bore. Unlike mechanically inserted liners, the EPDM or NBR compound is cured under heat and pressure inside the body casting itself, creating a permanent molecular-level bond that cannot separate from the body wall.

Flat face (FF) flanges are standard on the concentric AWWA C504 model, per ANSI B16.1 Class 125. The entire flange face is machined flat with no raised face projection. This flat-face configuration is the traditional waterworks standard and ensures full-face gasket contact with mating AWWA pipe flanges. Flat-face flanges distribute bolt load evenly across the entire flange surface, preventing the point-load cracking that can occur if a raised-face flange is over-torqued against a cast iron flat face.
AWWA C504 Concentric Double Flange Butterfly Valve | Vulcanized Flat Face Seat

AWWA C504 Concentric Double Flange Butterfly Valve with Vulcanized Flat Face Seat

1. Basic Technical Specification

  • Model Type: Concentric Double Flange Butterfly Valve
  • Design Standard: AWWA C504
  • Size Range: DN80 - DN1500 (3" ~ 60")
  • Rated Working Pressure: 150psi
  • Flange End Standard: ANSI / ASME B16.1 125lb / 250lb Flat Face
  • Top Mount Flange: ISO 5211 Universal Actuator Mounting Flange
  • Test Standard: AWWA C504 Hydrostatic & Bubble Tight Seat Test
  • Seat Type: Integral Vulcanized Replaceable Soft Seat

2. Disc-to-Seat Sealing Mechanics — Concentric Design

Characteristic Concentric Design Behavior
Seal engagement Continuous 360° contact from fully closed to approximately 85° open; only the last 5° of opening breaks seal contact
Low-pressure sealing Excellent — preloaded rubber interference creates a tight seal even at near-zero differential pressure, critical for reservoir isolation
Breakaway torque Highest of all designs — static friction from full-circumference rubber compression must be overcome to initiate disc movement
Running torque Moderate and nearly constant across the stroke; uniform rubber compression provides consistent resistance
Seat wear mode Abrasive wear from continuous disc-to-rubber rubbing. Acceptable in clean water; accelerated if media contains silt or grit
Best application Infrequent open-close cycling (isolation service), clean treated water, low-pressure systems where actuator size is not a constraint

3. Flat Face Flange Technical Details

Parameter Specification
Flange standard ANSI B16.1 Class 125 (flat face)
Flange surface finish 125-250 µin Ra (serrated or smooth, per AWWA C504)
Gasket type Full-face elastomeric (EPDM/NBR) or compressed fiber sheet — gasket must cover entire flange face for flat-face joints
Bolt torque characteristic Lower torque than raised-face; flat face prevents point-loading on the cast iron flange edge
Compatible mating flanges ANSI B16.1 Class 125 cast iron, AWWA C207 Class B/D steel rings, ANSI B16.5 Class 150 (with full-face gasket)
Mating bolt pattern Drilled per ANSI B16.1 125-lb template; bolt holes straddle the vertical centerline

4. Material Specification

Part Optional Material ASTM Standard
Body Ductile Iron / Stainless Steel A536 Gr.65-45-12 / A351 CF8 / CF8M
Disc Plated Ductile Iron / Bronze / Stainless Steel A536 Gr.65-45-12 / B148 C95400 / C95800 / A351 CF8 / CF8M
Shaft Stainless Steel A276-410 / 304 / 316
Seat EPDM / NBR Water grade vulcanized rubber
Bushing FRP / PTFE / Bronze Self-lubricating wear-resistant composite
O-Ring NBR / EPDM / Viton High temperature & ozone resistant elastomer

5. Overall Dimension Drawing & Size Table

AWWA C504 Concentric Double Flange Butterfly Valve Dimension CAD Drawing

Dimension Data DN80 ~ DN450

DN(mm) Inch A B C(inch)
803158955
10041761275
15062121395
20082361746
250102652038
300123052428
350143682678
400163094008
450183404228

Dimension Data DN500 ~ DN1500

DN(mm) Inch A B C(inch)
500203624558
600244525658
7503065051012
9003672063612
10504285875812
11504691082515
12004895784315
135054103095015
150060105097515
Custom Service Note: Other Special Material and Dimension Requested, Please Contact us Directly
Official Website: www.lauxvalve.com

AWWA C504 Double Eccentric Flange Butterfly Valve

The double eccentric (double offset) butterfly valve introduces two deliberate shaft offsets that fundamentally change how the disc interacts with the seat. This design is increasingly specified for larger AWWA C504 valves (DN600+) and for applications requiring frequent cycling or modulating control — where the concentric design's continuous seat friction becomes a constraint on performance and longevity.

The two offsets are:

First offset (E1):The shaft centerline is offset from the sealing plane — the shaft passesbehindthe disc face rather than through its center. This means the shaft does not intersect the sealing surface at any point, creating an uninterrupted 360-degree seal ring with no shaft penetration gaps across the sealing surface.

Second offset (E2):The shaft centerline is offset from the pipe bore centerline — the shaft is positioned slightly to one side of the pipe axis. This asymmetry creates a cam-like motion: as the disc begins to open, itlifts awayfrom the seat rather than sliding across it.

The combined effect of both offsets is that the disc breaks contact with the seat within the first 2-3 degrees of opening. For the remaining 85+ degrees of rotation, there is zero friction between disc and seat — the only resistance is hydrodynamic drag from the flowing water. This eliminates approximately 90% of the seat wear that a concentric valve experiences over its operating life, and enables the use of smaller, more economical actuators.
AWWA C504 Double Eccentric Butterfly Valve | Two Offset Waterworks Valve

AWWA C504 Double Eccentric Butterfly Valve (Two Offset Design)

1. Basic Technical Specification

  • Model Type: Double Eccentric Double Flange Butterfly Valve
  • Design Standard: AWWA C504, API 609, MSS SP 67
  • Size Range: DN80 - DN1800 (3" ~ 72")
  • Working Pressure: 10Bar / 16Bar / 25Bar
  • Flange End Standard: ASME B16.1 / ASME B16.5 / ASME B16.47
  • Face to Face Standard: AWWA C504
  • Test Standard: AWWA C504
  • Top Mount Flange: ISO 5211 Universal Actuator Flange

2. Kinematic Comparison: Double Eccentric vs. Concentric

Parameter Concentric (Zero Offset) Double Eccentric (Two Offsets)
Disc-seat contact duration Continuous throughout ~85° of rotation Only the last 2-3° before fully closed
Seal engagement Sliding friction — disc edge drags across rubber Cam-action compression — disc approaches seat at a closing angle, then compresses without sliding
Breakaway torque High (rubber stiction + pressure load) Low — only bearing friction and hydrodynamic forces
Running torque Moderate and uniform Very low mid-stroke; peaks only at close position
Seat wear rate Proportional to cycle count ~10% of concentric wear rate at equal cycle count
Actuator sizing benefit Must overcome full rubber stiction Smaller, more economical actuator for same valve size and pressure
Modulating service suitability Poor — continuous friction causes uneven wear and hysteresis Good — low friction enables smoother positioning and reduces deadband
High differential pressure startup Very high torque — rubber compressed by pressure load + preload Moderate — seat is not preloaded until the closing position

When to choose Double Eccentric: Valve cycles over 500 times a year, DN600 and above large bore, SCADA modulating control, raw water with silt, high static differential pressure. Although the valve body cost is slightly higher, the overall operation and actuator investment can be greatly reduced in long-term projects.

3. Double Eccentric AWWA C504 Seat Configurations

Seat Type Mounting Material Options Best Application
Body-mounted resilient seat Vulcanized to body bore or mechanically retained in a dovetail groove on the body ID EPDM (standard), NBR Clean water, treated water — standard AWWA C504 double eccentric configuration with the familiar body-seat layout
Disc-mounted resilient seat Vulcanized or mechanically retained on the disc edge circumference EPDM, NBR, FKM Wastewater, raw water with abrasive solids — the disc carries the seat; when closed, the rubber on the disc compresses against a metal body seat ring. Seat can be field-replaced by removing the disc

Flange Selection Tips: Double eccentric AWWA C504 valves support both flat face (FF) and raised face (RF) flanges. RF flange is more widely used for new ANSI B16.5 steel pipeline construction; FF flange is for retrofitting old AWWA flat-face pipeline systems.

4. Torque Advantage & Actuator Cost Comparison

Valve Size Concentric Breakaway (Nm) Double Eccentric Breakaway (Nm) Torque Reduction Actuator Cost Saving
DN600 (24") 1,500 900 ~40% Actuator drops from 2,500 Nm to 1,500 Nm class — approximately 30% cost reduction
DN900 (36") 4,400 2,500 ~43% Actuator drops from 8,000 Nm to 4,000 Nm class — approximately 35% cost reduction
DN1200 (48") 10,000 5,500 ~45% Hydraulic cylinder sizing reduced proportionally — smaller cylinder, smaller power unit
DN1500 (60") 18,000 9,500 ~47% Double eccentric may enable electric actuation where concentric would require hydraulic — significant capital and maintenance savings

For valves above DN1200, the saved actuator procurement cost often exceeds the extra cost of double eccentric valve body, resulting in lower total installed cost for large motorized pipelines.

5. Double Eccentric Sealing Geometry — The Wedge Effect

The double offset forms an elliptical sealing track instead of a circular track. The disc follows an arc path and wedges into the seat during closing rather than sliding along rubber:

  • Mechanical advantage: Wedge geometry amplifies actuator torque at the sealing surface to achieve bubble tight shutoff with smaller drive units
  • Self-adjusting seal compression: After years of rubber compression set, the disc will automatically close deeper to maintain tight sealing without manual adjustment
  • Smooth opening without stiction: Disc lifts off the seat instantly when opening, eliminating large torque spikes found in concentric valves

Manufacturing Tolerance Standard

Double eccentric valves require stricter machining precision. The two offset dimensions E1 & E2 must be controlled within ±0.15mm. Laux Valve adopts 5-axis CNC one-time clamping machining for shaft bores and seat cavity to guarantee offset accuracy. Every finished valve undergoes low-pressure air full-stroke test with dial indicator to verify seat clearance curve meets drawing requirements.

6. Material Specification

Part Material ASTM Standard
Body Ductile Iron / Epoxy Coated Ductile Iron A536 Gr.65-45-12
Disc Stainless Steel A351 CF8 / CF8M
Shaft Stainless Steel A276-410 / 304 / 316
Disc Sealing NBR(NITRILE) Water resistant elastomer
Pin Stainless Steel ASTM A276
Clamping Ring Carbon Steel General structural steel
Connecting Bracket Ductile Iron ASTM A536
Packing EPDM / NBR Ozone resistant rubber

7. Overall Dimension Drawing & Size Table

AWWA C504 Double Eccentric Butterfly Valve Dimension CAD Drawing

Dimension DN100 ~ DN500

DN(mm) Inch A B L(mm) L(inch)
10042341221275
15062791531275
20083492161526
250104062192038
300125422672038
350145833152038
400166203502038
450186673732038
500207024282038

Dimension DN600 ~ DN1800

DN(mm) Inch A B L(mm) L(inch)
600247584502038
7503088552830512
80032101357330512
90036107163930512
105042123472330512
120048134383338115
1350541668107838115
1500601778121838115
1800722044142645718
Custom Service Note: Other Special Material and Dimension Requested, Please Contact us Directly
Official Website: www.lauxvalve.com
AWWA C504 Butterfly Valve | Waterworks Isolation Valve

AWWA C504 Butterfly Valve

AWWA C504 Butterfly Valve Core Features

Feature Technical Benefit
Rubber seat vulcanized to body Bubble-tight seal at full rated pressure; seat cannot shift or blow out. Replaceable without removing the valve from the pipeline (spool-type replacement seat design).
Ductile iron body (ASTM A536 Grade 65-45-12) Superior strength and impact resistance over grey cast iron. Handles pipe loads and backfill pressure in buried installations without cracking.
Fusion-bonded epoxy coating Minimum 250 micron (10 mil) dry film thickness inside and out. Resists corrosion in buried, submerged, and humid environments. AWWA C550 compliant.
SS316 (UNS S31600) shaft One-piece through-shaft design. Corrosion-resistant in raw water, treated water, and chlorinated water. No shaft coating required — solid stainless.
Self-lubricating sleeve bearings PTFE-impregnated bronze or 316SS-backed DU bushings at upper and lower shaft positions. Zero maintenance, zero grease, lifetime lubrication.
Mechanical seat retention Seat ring mechanically retained by a bolted stainless steel clamping ring, not by adhesive alone. Prevents seat blowout at full open under high-velocity flow.
Raised-face flanges Drilled to ANSI B16.1 Class 125 (compatible with Class 150). Full-face flange contact eliminates the need for flange adapters or transition rings.
ISO 5211 actuator mounting Top flange per ISO 5211 for direct mounting of electric actuators, gear operators, hydraulic cylinders, or pneumatic actuators.

Pressure & Temperature Ratings

Pressure Class Standard

Pressure Class Cold Working Pressure Design Pressure Shell Test Pressure Seat Test Pressure
Class 150B 200 psi (13.8 bar) 150 psi (10.3 bar) 300 psi (20.7 bar) 220 psi (15.2 bar)
Class 250B 300 psi (20.7 bar) 250 psi (17.2 bar) 450 psi (31.0 bar) 330 psi (22.8 bar)

Seat Material Temperature & Media Compatibility

Seat Material Temperature Range Typical Waterworks Application
EPDM 0°C to +80°C (32°F to 176°F) Treated drinking water, raw water, wastewater (non-oily)
NBR (Buna-N) -10°C to +80°C (14°F to 176°F) Raw water with trace hydrocarbons, reclaimed water

Wide Industry Applications

Application Scenario Typical Valve Size Recommended Configuration
Water treatment plant isolation DN200 – DN1200 Flanged, electric actuator with manual override
Raw water intake structure DN600 – DN1800 Flanged, hydraulic cylinder actuator
Clearwell / reservoir inlet-outlet DN300 – DN1500 Flanged, gear operator or electric actuator
High-service pump discharge DN200 – DN900 (Class 250B) Flanged, electric actuator, surge-rated disc
Transmission main valve vaults DN600 – DN1800 Flanged, buried-service coating, gear operator
Wastewater treatment plant DN100 – DN1200 Flanged, NBR seat, electric actuator
Filter backwash lines DN100 – DN500 Flanged, pneumatic cylinder actuator
Cooling water (power plants) DN400 – DN1800 Flanged, electric or hydraulic, EPDM seat

Comparison vs Other Isolation Valves

Comparison Item AWWA C504 Butterfly Valve Gate Valve Plug Valve
Weight (DN600) ~250 kg ~1,200 kg ~900 kg
Face-to-Face (DN600) ~230 mm (short body) ~630 mm ~600 mm
Operation Time (full stroke) Quarter-turn (fast) Multi-turn (slow) Quarter-turn (fast)
Buried Service Suitability Excellent (with extension stem) Good Good
Capital Cost Level Lowest Higher Medium
Maintenance Demand Low (only rubber seat replacement) Medium High (regular lubrication)

Seat Material Selection Guide

Seat Material Temperature Range Media Resistance Best Application
EPDM 0°C to +80°C Water, dilute acids, alkalis, ozone, UV, chloramines Treated drinking water, raw surface water (standard choice for AWWA C504)
NBR (Buna-N) -10°C to +80°C Water, oils, hydrocarbons, fats Wastewater, reclaimed water, raw water with petroleum traces

EPDM is the standard AWWA C504 seat material for drinking water and treated water applications. It is NSF/ANSI 61 certified for contact with potable water. EPDM provides excellent ozone and UV resistance, making it suitable for both buried and exposed installations. For applications involving hydrocarbons, specify NBR.

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Certification Quality Standard

100% Pressure Tested API598 ISO9001   CE  WRAS   ACS

AWWA C504 Butterfly Valve FAQ

What is a AWWA C504 Butterfly Valve?

An AWWA C504 butterfly valve is a rubber-seated flanged butterfly valve designed, manufactured, and tested to the American Water Works Association standard C504. It is specifically engineered for water supply and water treatment applications, featuring a rubber seat bonded to the valve body, ductile iron construction, and corrosion-resistant internal components. AWWA C504 is the most widely referenced standard for waterworks butterfly valves in North America and in international projects following US water industry practices.

What is the difference between AWWA C504 and an industrial butterfly valve?

AWWA C504 valves are designed specifically for waterworks service: they have rubber seats bonded to the body (not the disc), heavier ductile iron bodies for buried service, fusion-bonded epoxy coatings rated for immersion, and longer face-to-face dimensions for flange integrity. Industrial butterfly valves built to API 609 or similar standards may have different seat designs (PTFE, metal), lighter body sections, and are not tested to C504's specific hydrostatic and seat leakage requirements.

What pressure classes are available for AWWA C504 butterfly valves?

Two pressure classes: Class 150B (200 psi / 13.8 bar cold working pressure) and Class 250B (300 psi / 20.7 bar CWP). Class 150B covers most municipal water distribution and treatment plant applications. Class 250B is specified for high-head pumping stations and deep-buried transmission mains.

What sizes are available?

Standard sizes from 3 inches (DN80) through 72 inches (DN1800). Commonly stocked sizes: 3", 4", 6", 8", 10", 12", 14", 16", 18", 20", 24", 30", 36", 42", 48". Larger sizes up to 72" are built to order with extended lead times.

What body and seat materials are available?

Body is ductile iron per ASTM A536 Grade 65-45-12 as standard. Seat material: EPDM (standard, NSF 61 certified for drinking water) and NBR (for wastewater or hydrocarbon contact). Disc is ductile iron with SS316 edge, or full CF8M stainless steel as an option.

Can AWWA C504 butterfly valves be automated?

Yes. All AWWA C504 butterfly valves from Laux Valve include an ISO 5211 top mounting flange and are available with electric motor actuators (multi-turn or quarter-turn), hydraulic cylinder actuators, pneumatic actuators, and manual gear operators. Electric actuators are commonly specified for remote operation in water treatment plants and pumping stations. Actuators are factory-mounted and stroke-tested before shipment.

What is the difference between short body and long body AWWA C504 valves?

Short body (standard) conforms to AWWA C504 Table 1 face-to-face dimensions 鈥?the most common configuration for Class 150B valves. Long body provides an extended face-to-face (typically 1.5x to 2x the short body length) for additional flange joint rigidity. Long body is standard for Class 250B ratings and is sometimes specified for sizes above 48" or for buried installations with high soil loads.

Can these valves be used for buried service?

Yes. Because AWWA C504 butterfly valves are double-flanged (flanges on both sides), they are inherently rated for end-of-line dead-end service at full rated pressure in either direction. Unlike wafer butterfly valves, the flanged body can hold full pressure with a blind flange on one side.

Do you provide OEM and customized AWWA C504 butterfly valves?

Yes. Laux Valve provides OEM manufacturing with your brand name and logo on the valve body casting, nameplate, and packaging. Customizations include non-standard flange drilling patterns (BS 4504, JIS, AS), special seat materials, stainless steel discs, bypass valve arrangements, and custom actuator integration. Contact our engineering team with your specification for a quotation.

Why choose Laux Valve as your AWWA C504 butterfly valve manufacturer?

Laux Valve combines an ISO 9001-certified manufacturing facility, in-house ductile iron foundry, and 15+ years of butterfly valve production experience. We maintain stock of commonly specified AWWA C504 sizes for rapid delivery, offer competitive factory-direct pricing, and provide full documentation support including material test certificates, hydrostatic test reports, and coating inspection records with every shipment.
LAUX Valve is a trusted OEM butterfly valve manufacturer, delivering customized valve solutions with reliable quality and global service.
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