Double Flanged Butterfly Valves Engineered for Pipeline Isolation
Direct flanged body connection engineered with resilient seated concentric or double eccentric geometry for dependable shutoff across fluid transmission lines.
A Flanged Butterfly Valve connects directly to pipe companion flanges via bolted dual-flange faces, rotating a streamlined disc through 90 degrees for precise full flow opening or positive shutoff. Manufactured to support municipal clean water networks as well as high-capacity heavy industrial lines, our assemblies provide rigid mechanical integrity without inducing compressive pipeline strain. Explore our butterfly valve configurations for a broader comparison of connection and sealing options.
Primary applications encompass municipal water distribution, circulating cooling water loops, HVAC chilled fluid lines, and clarified process systems. Correct valve selection is grounded directly in working media composition, operating temperature, line pressure, maximum shutoff differential, and mating flange standards.
Engineered Stability & Transparent Flow Isolation for Critical Piping
Discover how our flanged butterfly valves deliver robust performance, structural integrity, and precise flow control for your most demanding pipeline projects.
Rigid Double Flanged Joints
Direct companion flange bolting delivers definitive mechanical alignment, eliminating compressive piping displacement and assuring structural longevity under heavy pipeline loads.
Standard to Large Bore Range
From concentric resilient seated models (DN50–600) up to double eccentric transmission assemblies (DN350–3000), our scalable platforms adapt directly to project capacity targets. For a compact inter-flange specification, compare our wafer butterfly valves and verify the required size, rating, and pipe clearance.
Dependable Isolation Integrity
Bi-directional positive sealing verified via hydraulic seat proof tests safeguards pumps and downstream processing assets against cross-contamination and unmanaged backflow.
Versatile Actuation Matching
Configurable with manual locking levers, heavy-duty worm gearboxes, electric multi-turn actuators, or pneumatic cylinders tailored directly to required shutoff differentials.
Looking for valve dimensional verifications or tailored torque sizing for your pipeline?
Consult Engineering TeamProven Reliability Across Mission-Critical Industrial Fluid Systems
Our extensive range of flanged butterfly valves is trusted across diverse industrial sectors to ensure safe, efficient, and continuous fluid management.
Engineered for municipal pump headers, water booster stations, and distribution trunk lines, delivering zero-leakage isolation with standardized companion flange bolt circles.
Applied in clean process circuits, manufacturing utility lines, and equipment branch manifolds to provide uncompromised shutoff and streamline routine pipeline maintenance.
Optimized for commercial central chiller plants and industrial cooling towers, compatible with clean chilled water and glycol thermal loops up to 40% volume concentration.
Deployed in low-solids effluent filtration galleries and industrial reclamation facilities where durable vulcanized liner seats prevent particle entrapment and disc binding.
Manufactured with certified sanitary wetted elastomeric seats and fusion bonded epoxy (FBE) internal coatings, complying with international potable hygiene safety standards.
Double eccentric flanged valve designs scaled up to DN3000 accommodate high hydraulic thrust, surges, and positive bidirectional isolation in bulk civil water transmission schemes.
Have a specific industrial application or operating condition to verify?
Request Application Engineering ReviewEstablish Defined Media & Working Boundaries to Prevent Specification Errors
Clearly define the chemical composition, thermal limits, and pressure parameters to guarantee precise valve selection and long-term pipeline safety.
Mandatory Pre-Selection Inputs
Media Composition
Detailed chemical identity, fluid phase, and additives impacting elastomer liners.
Operating Temp
Sustained continuous thermal boundary rather than theoretical maximum design rating.
Line Pressure
Normal operating vs transient line pressure and full P-T envelope verification.
Shutoff ΔP
Maximum differential across closed disc determining disc seating and gear output.
Clean & Process Water
Engineered with resilient concentric or eccentric vulcanized liners for municipal drinking supply, raw intake, and clean utility distribution without risk of disc seat pinching.
HVAC Water & Glycol Loops
Designed for commercial central cooling loops and industrial chiller networks. Specific density and viscosity compensation are factored into torque sizing to guarantee prompt actuator response.
Treated & Clarified Water
Suited for secondary clarification lines, recycled industrial utility water, and low-solids effluent streams. Prevents abrasive wear through streamlined disc profiles and protected shaft seals.
Certified Potable Water
Requires certified hygienic elastomer seats and fusion-bonded epoxy internal liners. Verified to regional sanitary standards ensuring safe municipal drinking water transmission.
Double Flanged Integration for Unyielding Pipeline Stability
Standardized double-flanged connections provide superior structural integrity, resisting downstream water hammer and external stresses while ensuring seamless drop-in replacements.
Stable Dual-Flange Bolting Interface
Bolts directly into companion pipeline flanges on both faces, creating a self-supporting structural anchor that resists downstream water hammer, seismic shifts, and heavy soil subsidence.
Standardized Flange Drilling Matching
Precise hole circle distribution configured to EN 1092-2 (Ductile Iron) and EN 1092-1 (Steel) standards, preventing hole misalignment and sealing gasket rupture during installation.
Verified Face-to-Face Envelope
Concentric short series and eccentric long series comply rigidly with EN 558 dimensions and approved GA drawings, ensuring precise retrofit drop-in replacement without pipe modification. If a U-type body is specified, review our U-type butterfly valves and verify the project face-to-face and flange drawings.
EPC Project Interface & Schedule Security
Pre-production freeze of dimensional drawings, flange tables, and bolt torque guides empowers EPCs and contractors to verify civil clearances early, curbing on-site rework.
Reliable Fluid Isolation Starts from Verified Seat Geometries & Closed Differentials
Ensure absolute system integrity with our rigorously tested sealing geometries, designed to maintain drop-tight isolation under varying pressures and demanding operational conditions.
Precision Cutaway Anatomy
Resilient Soft Seating
Standard clean utility configurations incorporate vulcanized EPDM liners or replaceable high-elasticity rubber seats, ensuring zero-leakage drop-tight closure for municipal and cooling networks.
Concentric Disc Shutoff
Engineered for clean and clarified process water lines. Shutoff performance accounts for hydraulic operating pressure, installation differential, and transient water hammer protection.
Double Eccentric Geometry
Cam-action disc lifts immediately off the seat upon rotation to minimize continuous friction and seat wear. Optimized for large-diameter bulk water transmission lines up to DN3000.
Hydrostatic Proof Testing
100% factory inspected under EN 12266-1 and ISO 5208. PN10 shell/seat proofed to 15/11 bar; PN16 proofed to 24/17.6 bar. Pressure test records ensure full compliance prior to shipping.
Have critical shutoff differential or bi-directional leakage requirements?
Configure Reliable Mechanical Actuation Matched to Line Differentials & Control Systems
Select the optimal actuation method for your specific pipeline requirements, ensuring precise control, safety, and seamless integration with existing systems.
Suited for smaller nominal bores (≤ DN150) under low-differential conditions. Features graduated notch plates and quick-release safety locking handles for prompt visual open/close confirmation.
Recommended for medium to large-bore pipeline valves. Self-locking gear ratios prevent hydrodynamic disc flutter, damp water hammer surges, and allow smooth single-operator operation.
Engineered for central pump station automation and distribution grid telemetry. Fully compatible with On/Off or 4–20mA modulating duty, Modbus/Profibus fieldbus, and manual overrides.
Double-acting or spring-return scotch yoke actuators suited for frequent operational cycles, quick isolation sequences, and fail-open/fail-closed protection across clean fluid processes.
Torque sizing must reflect worst-case closed differential pressure across the disc rather than nominal pipe rating.
Accounts for breakaway seating, hydrodynamic running torque, and stem packing friction under fluid temperatures.
Defines motor duty cycle, heat dissipation requirements, gear tooth endurance, and preventative maintenance schedules.
Verifies available 3-phase power supply, instrument air pressure limits, analog signaling, and failsafe conditions.
Need calculated actuator torque calculations or ISO 5211 top flange dimensions?
Wetted Materials & Structural Alloys Engineered for Specific Fluid Media
Explore our high-grade materials and advanced alloys, rigorously selected to ensure maximum durability, corrosion resistance, and optimal performance across various demanding industrial fluid applications.
Standard Industrial Water BOM Configuration
High tensile strength cast housing rated for standard PN10/PN16 pipelines with internal fusion bonded epoxy (FBE ≥ 250 µm) coating.
Hydrodynamically contoured disc edge ensuring laminar fluid flow transition and exceptional pitting resistance across treated water.
Precision machined one-piece or through-shaft verified against torsional deflection and peak breakaway shutoff differential pressures.
High-rebound polymer elastomer rated -10°C to +110°C for zero-leakage drop-tight sealing across potable and clean cooling circuits.
Interdependent Wetted System Matching
Body, disc profile, drive shaft, and sealing elastomeric rings are qualified under an identical verified bill of materials, preventing electrolytic galvanic corrosion.
Dedicated Elastomers by Fluid Media
Water applications employ certified resilient EPDM; petroleum, oily condensates, and utility gases mandate dedicated NBR compounds, preventing premature swelling.
Special Corrosive & Marine Metallurgies
Seawater, desalination, and brackish flow streams utilize dedicated C95800 Nickel Aluminum Bronze trim or fully rubber-lined bodies for uncompromised longevity.
Material & Heat Number Traceability
Pressure-retaining ductile iron melt batches, elastomer formulation codes, and EN 10204 3.1 chemical/physical certificates correlate directly to unique valve IDs.
Need custom wetted alloys or special media chemical compatibility verification?
Request Material Compatibility ReviewAccurate Flow Capacity, Verified Pressure Drop & Operational Dynamics
Optimize your pipeline efficiency with precision-engineered flow coefficients, minimized pressure drops, and rigorously tested hydrodynamic operational dynamics ensuring systemic reliability.
Essential Sizing & Hydrodynamic Inputs
Specify normal steady-state throughput, transient peak flow, and continuous line velocities (recommended ≤ 3.0 m/s for clean water lines) to evaluate valve aperture.
Define maximum allowable line pressure drop across full 90° open position, factoring fluid specific gravity and viscosity variations across glycol solutions.
Confirm total static upstream head against empty downstream pipeline conditions to ensure shaft rigidity, seat compression, and prevent valve blow-by.
Torque output calculations must account for dynamic hydrodynamic fluid forces, break-away friction, seat interference, and applied project safety factors (≥ 1.25).
Kv / Cv Flow Capacity
Defines volumetric discharge at 1 bar pressure differential. Exact Kv characteristics are supplied per nominal bore and incremental 10° disc angle increments, avoiding generic nominal tables.
Localized Pressure Drop
Head loss correlates strictly with fluid Reynolds number, streamlined disc profile, and media viscosity. Water and glycol mixtures are calculated with accurate specific gravity correction factors.
Shutoff Differential (ΔP)
The critical design input for elastomeric seat interference and drive shaft diameter. Double eccentric flanged valves feature verified forward and reverse directional shutoff ratings.
Operating Torque Dynamics
Torque requirements factor seating/unseating friction, packing drag, and dynamic hydraulic torque caused by fluid velocity, sized specifically to manual levers, gearboxes, or power actuators.
Need hydraulic Kv calculation or differential pressure drop curves for your pipeline size?
Consult Engineering for Flow CalculationRigorous Engineering Standards to 100% Individual Hydrostatic Release
Discover our stringent engineering protocols, from initial design norms to individual high-pressure hydrostatic testing for guaranteed reliability. Review RUITO's manufacturing and quality capabilities when qualifying the project supplier.
Design Foundation
Governs overall metallic butterfly valve design, wall thickness integrity, disc hydrodynamics, and shaft stress margins tailored to specific industrial line media.
Dimensions & Drilling
Standardized face-to-face series (Series 13/14) and flange drilling matching EN 1092-1/2 or ASME B16.5, eliminating pipe re-alignment on installation.
Hydrostatic Pressure
Individual high-pressure shell strength and bubble-tight resilient closure testing executed under controlled test rigs before surface coating and assembly.
Verification & Release
Digital holding time curves, leakage criteria (Rate A), bidirectional test certs, and operational torque values certified for quality dossier release.
Standard Ambient Hydrostatic Test Parameters
Validated under ambient conditions with zero seat leakage (Rate A) per EN 12266-1.
Double Eccentric Independent Reverse Proof
Large-bore eccentric configurations undergo independent reverse seating hold tests. Reverse shutoff margin is never calculated simply by forward rating extrapolation.
Require dedicated witnessing, third-party inspection, or EN 10204 3.1 test records?
Request Testing Protocols & Inspection PlansFrom Valve Heat Numbers to Complete Project Dossiers
Ensure complete project compliance with our comprehensive documentation packages, linking unique serial numbers to full material and testing dossiers.
End-to-End Product Traceability Chain
01. Unique Valve Serial & Nameplate ID
Riveted stainless steel tags engraved with heat batch, serial number, pressure class, and PO reference facilitate prompt verification on site.
02. Controlled Materials & Sub-BOM
Body casting melts, CF8M disc chemistry, elastomer cure batches, and stem forgings adhere strictly to approved frozen BOM revisions.
03. Real-Time QA/QC Test Records
Every hydraulic test pressure, pressure hold duration, gauge calibration record, and functional torque test is permanently archived.
04. Crate & Tag Matching for EPC Logistics
Export wooden crates, packing schedules, valve tagging, and shipping dossiers are synchronized, eliminating site sorting downtime.
Approved 2D CAD/3D dimensional drawings highlighting bolt circle, face-to-face, clearance radius, and actuator centerlines.
Detailed metallurgy specification certifying EN-GJS ductile body, CF8M disc alloy, stem grade, and vulcanized EPDM formulations.
Specific pressure-temperature operating envelop curves ensuring line temperature surges remain within safe elastomer elasticity bounds.
Pre-production quality verification protocol defining witness hold points, visual checks, NDT, and third-party inspection schedules.
Comprehensive guideline detailing flange bolt torque sequences, pipe alignment clearances, gearbox greasing, and seal service.
Final compiled project binder enclosing EN 10204 3.1 mill test certificates, hydrostatic logs, coating thickness tests, and sign-offs.
Need engineering drawing packages (DWG/STEP) or project-specific ITP approval?
Download Sample Dossier & Request GA SubmittalsTailored Engineering Alignment for Rigorous Project Conditions
Comprehensive engineering evaluation, customized machining, and rigorous testing to ensure optimal valve performance in demanding pipeline environments.
Condition Input
Submission of media composition, thermal curve, normal/peak line pressure, maximum shutoff ΔP, and companion flange code.
Technical Review
Application engineering assessment determining structural category, Kv requirements, and shaft stress margins.
GA & BOM Freeze
Issuance and mutual sign-off of dimensional CAD submittals, top flange ISO 5211 patterns, and chemical formulations.
First Article Proof
Specialized machining verification, CMM flange face tolerance testing, and pilot hydrostatic shell tests.
Controlled Release
Full batch manufacturing governed by strictly controlled Engineering Change Notices (ECN) maintaining repeatability.
Flange Drilling & Face-to-Face
Custom Piping Interface MatchingStandardized or customized bolt hole patterns compatible with EN 1092-2 (PN10/16/25), ASME B16.5, or AWWA C207. Available in EN 558 Series 13 or Series 14 envelopes to facilitate drop-in plant retrofits without piping modification.
Media Metallurgy & Sealing
Engineered Chemical CompatibilityDedicated trim selection calibrated to fluid chemistry: ductile iron GJS-450-10 bodies with internal FBE (≥ 250 µm), CF8M or C95800 nickel aluminum bronze discs, duplex stainless stems, and vulcanized EPDM or NBR resilient sealing.
Actuation & SCADA Interface
Dynamic Torque Safety FactorPrecision mounting according to ISO 5211 top flange standards. Configurable with enclosed worm gearboxes, 4–20mA modulating intelligent electric multi-turn actuators, or spring-return failsafe pneumatic systems.
Large-Bore Projects
DN350 to DN3000 ScopeTailored engineering for massive civil pipelines. Incorporates cam-action disc lift geometry to eliminate seat scrubbing, specialized heavy trunnion bearings, independent reverse shutoff proofing, and integrated heavy rigging brackets.
Heavy Machining & Actuator Mounting Workshop
Double flanged valves up to DN3000 undergo precise horizontal CNC boring, laser flange face flatness verification, and dynamic torque calibration on heavy test pedestals. Dedicated witness hold points accommodate client QA/QC inspectors prior to crating.
Have custom companion flange standards, special face-to-face dimensions, or exotic trim requirements?
Specify These 8 Engineering Inputs for Rapid, Accurate RFQ Pricing
Streamline your quoting process by providing these essential project parameters and recommended technical documentation below.
Fluid Media Composition
Specify whether media is potable water, glycol recirculation, raw river intake, or treated wastewater. Note abrasives or corrosive chlorides.
Nominal Bore & Pressure Rating
Specify exact pipeline diameter (DN50 to DN3000) and design pressure rating. Nominal rating determines structural casting baseline.
Operating Temp & Pressure
Provide actual continuous working temperature and pressure. Temperature determines permissible elastomer modulus limits.
Flow Capacity & Permissible ΔP
State design flow velocity (m/s) and maximum acceptable pressure drop across the fully opened valve to ensure Kv verification.
Peak Shutoff ΔP & Direction
State maximum differential pressure against a closed disc. Confirm whether full bi-directional reverse shutoff is mandatory.
Flange Standard & Face-to-Face
Confirm companion flange code (EN 1092-2, ASME B16.5), raised/flat face (RF/FF), and required overall dimension length.
Operation & Actuation Controls
For automated units, provide power supply, minimum pneumatic pressure, control protocols (Modbus, etc.), and fail-safe position.
Standards & Quality Dossier
Identify project compliance requirements: EN 10204 3.1 material certs, WRAS/NSF drinking water approvals, or third-party inspection.
Expedite Proposal Turnaround with Supplementary Project Documents
Process Datasheet
Valve design parameters, fluid thermal properties, normal/upset operating scenarios, and design codes.
P&ID / Valve Schedule
Tag identifiers, valve line numbers, fail states, installation coordinates, and automation boundaries.
Existing GA Drawing
Critical face-to-face dimensions, pipe companion drawings, and spatial envelope limits for retrofit projects.
Project Specification
Approved vendor lists (AVL), specialized coating specifications, and ITP inspection guidelines.
Ready to submit your valve schedule or pipeline parameters for competitive commercial pricing?
Engineered Flanged Butterfly Valves for Exact System Parameters
Whether procuring standard municipal water flanged valves or configuring heavy double eccentric assemblies for transmission trunks, providing defined media and piping boundaries guarantees zero-gap technical alignment and rapid commercial proposal turnaround.
Request Engineering Sizing & RFQ
Submit preliminary piping conditions. Uploading datasheets, P&IDs, or GAs eliminates clarification rounds.