Flanged Butterfly Valve – Custom Valve by Leading Foundry

1. Ներածություն

A Flanged butterfly valve (FBV) is a quarter-turn valve widely recognized as the workhorse of high-pressure and permanent fluid control systems.

Characterized by their integral flanges that bolt directly to pipeline flanges, they provide a rigid, leak-proof, and structurally stable connection,

a critical advantage over wafer-style valves (space-saving but suited for low-pressure duties) and lug-style valves (moderate pressure, often for non-critical service).

Engineered for medium to large-diameter pipelines, flanged butterfly valves combine Ամուր անջատում, structural reliability, and ease of maintenance.

Միևնույն ժամանակ, their versatility makes them indispensable in Treatment րի մաքրում, HVAC networks, and general industrial processing, where their compact design, cost-efficiency, and adaptability across pressure and temperature ranges deliver long-term operational value.

2. What is a Flanged Butterfly Valve?

Core Definition and Working Principle

Էունք flanged butterfly valve (FBV) է quarter-turn rotary valve designed for regulating or isolating flow in pipelines.

Its defining feature is the integral flanges, which bolt directly to pipe flanges (per ANSI B16.5 or ISO 7005), ստեղծելով ա rigid, leak-tight, and permanent connection suitable for high-pressure service.

The valve operates on a simple principle:

• Fully Open (0°): The disc lies parallel to flow, minimizing pressure loss (typically 1–3 psi for a 6-inch valve at nominal flow).
• Շռայլ (10–80°): Partial rotation restricts flow; eccentric disc designs provide more linear flow control than concentric types.
• Fully Closed (90°): The disc presses firmly against the seat, achieving tight shutoff. FBVs are bidirectional, handling forward and reverse flows effectively.

Anatomy of a Flanged Butterfly Valve

A flanged butterfly valve is engineered for durability and precision control, typically comprising six core components:

Flanged vs. Wafer vs. Lug Butterfly Valves

Է integral flange design sets FBVs apart from wafer and lug types, offering unique advantages for high-demand applications:

3. Design Variations: Concentric vs. Eccentric Flanged Butterfly Valves

Flanged butterfly valves are classified primarily by disc and stem alignment, a critical factor influencing Press նշման վարկանիշ, կնքման կատարումը, torque requirements, and application suitability.

Concentric Flanged Butterfly Valves (Standard Design)

Երկրաչափություն: The disc and stem axes align with the valve’s bore center, making the design concentric. During operation, the seat maintains contact across the entire disc surface.

Performance Metrics:

• Pressure Rating: ANSI Class 150–300 (28–70 bar at 20°C)
• Leakage Class: API 609 Class IV (≤0.01% of nominal flow for liquids)
• Torque Requirement: 60–100 N·m (6-inch valve, EPDM seat)
• Cycle Life: 10,000–20,000 cycles (resilient seat limits lifespan)

Առավելություններ:

• Պարզ, cost-effective design
• Easy maintenance and seat replacement
• Suitable for moderate temperature and pressure fluids

Սահմանափակումներ:

• High disc-seat friction reduces efficiency
• Not suitable for gas service or high-pressure applications
• Limited durability under abrasive or high-temperature fluids

Բնորոշ ծրագրեր:

• HVAC chilled water systems
• Municipal water distribution
• Low-pressure, non-critical industrial services

Eccentric Flanged Butterfly Valves (High-Performance Design)

Overview: Eccentric designs offset the disc or stem, reducing disc-to-seat friction and enhancing sealing performance.

These designs are ideal for բարձր ճնշում, high-temperature, and gas applications.

Single Eccentric (Offset Disc) Flanged Butterfly Valve

Դիզայն: The disc center is offset from the stem axis, which minimizes contact with the seat during rotation, reducing friction.

Performance Metrics:

• Pressure Rating: ANSI Class 300–600 (70–140 bar)
• Leakage Class: API 609 Class V (≤0.001% of nominal flow)
• Torque Requirement: 40–70 N·m (6-inch valve, PTFE seat)—~30% lower than concentric valves

Ծրագրեր:

• Industrial water treatment
• Low-pressure oil lines
• Applications requiring moderate flow control with improved efficiency

Double Eccentric (Offset Disc + Ցողուն) Flanged Butterfly Valve

Դիզայն: Both the disc center and stem axis are offset from the bore center. This eliminates disc-seat contact until 80–85% of closure, significantly reducing friction and wear.

Performance Metrics:

• Pressure Rating: ANSI դաս 600 (140 bar at 20°C); up to Class 900 with metal seats
• Leakage Class: API 609 Class vi (≤0.00001% of nominal flow) — suitable for gas service, including natural gas pipelines
• Temperature երմաստիճանի միջակայքը: -29°C to 482°C (metal seats)

Ծրագրեր:

• Քիմիական մշակում
• Յուղել & Գազատարներ
• Steam systems
• High-pressure industrial fluids requiring tight shutoff

Triple Eccentric (Օֆսեթ + Tapered Disc) Flanged Butterfly Valve

Դիզայն: Adds a third offset by introducing a conical/tapered disc geometry, achieving a metal-to-metal seal without the need for an elastic seat.

This design enables operation under extreme temperatures and pressures.

Performance Metrics:

• Pressure Rating: ANSI դաս 900 (210 bar at 20°C)
• Temperature երմաստիճանի միջակայքը: -29°C to 650°C (Stellite® or hard metal seats)
• Cycle Life: 50,000–100,000 cycles (metal seat durability)

Ծրագրեր:

• Hypersonic vehicle cooling systems
• Power plant superheated steam lines
• Refinery catalytic crackers and petrochemical processing
• Extreme industrial environments requiring zero-leakage and long life

Ամփոփում:

4. Նյութեր & Seals of Flanged Butterfly Valve

The performance, հուսալիություն, and longevity of double flanged butterfly valves (FBVs) are strongly influenced by Նյութի ընտրություն for the body, սկավառակ, ցողուն, and sealing elements.

Proper materials ensure compatibility with the fluid, resistance to corrosion, high-pressure handling, and suitability for temperature extremes.

Մարմնի նյութեր

The valve body is the primary pressure boundary and must withstand mechanical stress, internal pressure, and environmental corrosion. Common body materials include:

Սկավառակի նյութեր

The disc is directly exposed to flow and often handles abrasive, erosive, or corrosive fluids. Selection is based on Մեխանիկական ուժ, Կոռոզիոն դիմադրություն, and sealing compatibility:

• 316 Չժանգոտվող պողպատ: Widely used for general-purpose chemical, ջրմուղ, and steam applications.
• Hastelloy c276: Resistant to oxidizing and reducing chemicals; suitable for aggressive acids.
• Ductile Iron with PTFE Coating: Low-friction, corrosion-resistant option for water and mild chemicals.
• Աստղ®-Clad Discs: High-temperature and high-wear applications, including superheated steam and petrochemicals.

Design Note: The disc may be concentric, eccentric, or triple-offset, with metal or resilient coating to improve sealing and reduce wear.

Ցողունային նյութեր

The stem transmits torque from the actuator or handwheel to the disc and is exposed to mechanical stress, ճնշում, and fluid contact. Common materials:

Seat Materials and Seal Types

Է seat forms the critical sealing interface with the disc, determining leakage class, torque requirement, and service life. Selection depends on Հեղուկի տեսակը, ճնշում, and temperature.

Gaskets and Actuator Interfaces

• Flange Gaskets: Գրաֆիտ, PTFE, or nitrile gaskets ensure leak-proof flange connections between the valve and pipeline.
• Actuator Seals: O-rings or PTFE bushings prevent fluid leakage along the stem while enabling smooth torque transfer.

5. Արտադրություն & Foundry Methods of Flanged Butterfly Valves

-ի արտադրությունը flanged butterfly valves (FBVs) requires high precision, robust materials, and strict adherence to international standards such as API 609, Iso 5752, and ANSI B16.5.

Valves designed for high-pressure and high-performance applications—like oil & Գազատարներ, Քիմիական բույսեր, and power generation—must exhibit ծավալային ճշգրտություն, structural integrity, and leak-tight performance.

Casting Butterfly Valve Components

Casting is the primary method for shaping valve bodies and discs, allowing complex geometries and cost-effective production. For large valves (typically over 12 դյույմ), Ավազի ձուլում is widely used.

In this process, molten metal (1450–1550°C) is poured into resin-bonded sand molds.

Sand casting offers tolerances around ±0.5 mm, making it suitable for carbon steel or ductile iron valves used in municipal water or low-pressure industrial pipelines.

For small-to-medium valves (2–12 inches) requiring high dimensional precision and corrosion resistance, Ներդրումների ձուլում (lost wax method) is employed. Wax patterns are coated with ceramic shells, melted out, and replaced with molten metal.

This method achieves tight tolerances (±0.1 mm) եւ հարթ մակերեսներ, enabling precise features such as double eccentric disc hubs.
Investment casting is ideal for 316L stainless steel, Հաստելո, or other corrosion-resistant alloys.

Դավաճանություն: High-Strength Components

Forging is the preferred method for critical, high-pressure components such as bodies, եզրեր, and stems, because it produces superior grain structure and higher tensile strength.

Heated metal (1100–1200°C) is shaped under hydraulic presses or dies, resulting in 20–30% stronger parts than equivalent castings.

Forged components are typically used in ANSI Class 600 or higher valves for oil & Գազատարներ, Էլեկտրաէներգիա, and other demanding industrial applications.

Forging methods include open-die forging for large custom parts, closed-die forging for medium-sized components with precise dimensions, and upset forging to reinforce critical junctions like disc hubs.

Վերամբարձ: Precision Finishing

After casting or forging, CNC հաստոցներ ensures high dimensional accuracy, Մակերեւույթի ավարտը, and proper alignment:

• Flange faces are milled to achieve flatness within 0.1 mm and bolt hole alignment per ANSI B16.5 standards, ensuring leak-free connections.
• Seat bores are honed or machined to Ra 1.6–3.2 μm to allow proper seat bonding and effective sealing.
• Discs and hubs, especially eccentric designs, are finished with 5-axis CNC milling to maintain flatness within 0.05 mm for tight shutoff.
• Stems and bearings are turned and milled with precision to guarantee smooth rotation and correct torque transfer.

He երմամշակում: Mechanical and Corrosion Properties

Heat treatment improves strength, կարծրություն, and corrosion resistance depending on the material used:

• Ածխածնի պողպատ (Wcb): Quenched at 850°C and tempered at 650°C to achieve tensile strength ≥485 MPa.
• 316L չժանգոտվող պողպատ: Solution-annealed at 1050–1100°C followed by water quenching to restore corrosion resistance and homogenize microstructure.
• Կրկնակի 2205: Solution-annealed at 1020–1080°C to achieve a balanced austenite/ferrite ratio (50:50), optimizing both strength and corrosion resistance.

Surface Treatment: Երկարակեցություն & Կոռոզիոն դիմադրություն

Surface finishing ensures durability in harsh environments:

• Պասիվություն for 316L stainless steel enhances the natural chromium oxide layer, improving corrosion resistance by up to 20%.
• Epoxy coatings of 100–150 μm protect carbon steel bodies in oil & gas pipelines from soil and atmospheric corrosion.
• Էլեկշռում is used in sanitary applications (սնունդ, ըմպելիք, դեղագործություն) to achieve Ra ≤0.8 μm, eliminating microscopic crevices and bacterial dead zones.

Ժողով & Որակի ապահովում

After machining and surface treatment, valves undergo assembly and rigorous quality control:

• Seat and disc integration: Seats are bonded or pressed, and eccentric discs are carefully aligned for precise shutoff.
• Stem installation: Առանցքակալներ, փաթեթավորում, and O-rings are fitted, and torque is verified.
• Hydrostatic or pneumatic testing: Confirms leak-tight performance under design pressure.
• Ոչ կործանարար փորձարկում (Նիդ): Methods such as X-ray, ուլտրաձայնային, or dye penetrant inspections detect internal defects.
• Actuator calibration: Ձեռնարկ, էլեկտրական, օդադող, or hydraulic actuators are tested for torque and stroke accuracy.

6. Press նշման վարկանիշներ, Sizes & Ստանդարտներ

Flanged butterfly valves (FBVs) are designed for reliability across a wide range of pressures, sizes, and industrial standards.

Proper selection ensures safety, long-term performance, and compatibility with pipeline systems.

Press նշման վարկանիշներ

Standard Sizes

Face-to-Face Dimensions: Usually conform to ISO 5752 Series 10 or API 609 for easy interchangeability.

Key Standards & Հավաստագրեր

7. Ակտիվացում & Control Systems

Flanged butterfly valves are quarter-turn devices requiring actuators capable of 90° rotation.

Actuator selection depends on valve size, torque requirement, Հեղուկի տեսակը, and control sophistication.

Common Actuator Types and Specifications

Key Accessories for Enhanced Control

• Positioners: Provide precise modulating control (±0.5% accuracy), crucial for applications like HVAC chilled water, Քիմիական դեղաչափ, or industrial process lines.
• Torque Switches: Protect the disc and seat from over-torquing, preventing premature wear or damage.
• Limit Switches: Deliver open/closed position feedback to SCADA or DCS systems for remote monitoring and automated safety protocols.
• Solenoid Valves & Air Filters (for pneumatic actuators): Ensure rapid, reliable actuation while protecting internal actuator components from contaminants.

8. Flanged End Geometry & Interface

Է flanged end design is the defining characteristic of butterfly flange valves, ensuring a rigid, secure, and leak-tight connection to pipeline systems.

The geometry is standardized globally to allow full interchangeability across manufacturers.

Flange Standards & Compatibility

Flanged butterfly valves are machined to match pipeline flanges in dimensions, bolt-hole patterns, and pressure ratings. The most common standards include:

Dimensional Geometry

The flanged end geometry typically includes:

• Raised Face (ՌԴ): Standard sealing surface, 2–6 mm raised area around the bore, ensures even gasket compression.
• Flat Face (FF): Used with cast iron pipelines to avoid overstressing flanges.
• Ring-Type Joint (RTJ): Machined grooves for metal gaskets, suited for high-pressure/high-temperature services (մինչեւ 210 bar, 650° C).

9. Industrial Applications of Flanged Butterfly Valves

Flanged butterfly valves are versatile, high-performance quarter-turn valves widely used across industrial sectors due to their reliability, compact design, and adaptability to a broad range of pressures, ջերմաստիճանը, and fluids.

Ջրի և կեղտաջրերի մաքրում

• Ծրագիր: Flow isolation, Քիմիական դեղաչափ, and backwashing systems.
• Առավելություններ: Tight shutoff, low-pressure drop, corrosion-resistant seats for treated water or chemical additives.
• Օրինակ: Municipal water distribution networks employ butterfly flange valves for diameters exceeding 12 դյույմ, ensuring maintenance-friendly operation.

Նավթի եւ գազի արդյունաբերություն

• Ծրագիր: Crude oil pipelines, refined products, gas distribution, and offshore platforms.
• Առավելություններ: High-pressure tolerance (ANSI դաս 600 և վերևում), bidirectional flow capability, compatibility with hydrocarbons and corrosive fluids.
• Օրինակ: Double or triple eccentric flanged butterfly valves control oil and gas pipelines where minimal leakage and high reliability are mandatory.

Էլեկտրաէներգիայի սերունդ

• Ծրագիր: Գոլորշի, Սառեցնող ջուր, and feedwater systems in thermal and nuclear plants.
• Առավելություններ: High-temperature tolerance, tight sealing for steam lines, rapid quarter-turn actuation for safety.
• Օրինակ: Triple eccentric butterfly flange valves handle superheated steam at 482°C in power plant feedwater lines.

Chemical and Petrochemical Processing

• Ծրագիր: Aggressive chemicals, թթու, and high-temperature processes.
• Առավելություններ: Նյութական բազմակողմանիություն (316Լակոտ, Հաստելո, Կրկնակի 2205), precise throttling, minimal friction for controlled flow.
• Օրինակ: Eccentric flanged butterfly valves with metal seats prevent leakage in sulfuric acid or caustic soda lines.

Heating, Օդափոխում, and Air Conditioning (Hvac) and Industrial Chilled/Hot Water Systems

• Ծրագիր: Flow regulation in chilled water loops, cooling towers, and heating systems.
• Առավելություններ: Ծախսարդյունավետ, թեթեւակի, low-pressure rating suitable for non-critical applications, Հեշտ սպասարկում.
• Օրինակ: Concentric butterfly flange valves regulate building-wide chilled water distribution efficiently.

Սնունդ, Beverage, and Pharmaceutical Industries

• Ծրագիր: Sanitary processing lines, CIP (Clean-in-Place) համակարգեր.
• Առավելություններ: Electropolished stainless steel, FDA-approved seats, smooth surfaces eliminate bacterial growth zones.
• Օրինակ: Flanged butterfly valves with EPDM or PTFE seals ensure hygienic flow control in beverage bottling plants.

Mining and Slurry Handling

• Ծրագիր: Tailings pipelines, slurry transport, and water control.
• Առավելություններ: Robust construction, abrasion-resistant discs and seats, compatibility with viscous or particle-laden fluids.
• Օրինակ: Carbon steel double flanged butterfly valve with hardened seats handle mineral slurries without rapid wear.

10. Համեմատություն այլ փականների հետ

11. Եզրափակում

Է flanged butterfly valve is a versatile and cost-efficient solution for fluid control, offering a balance of compact design, high flow capacity, and reliable sealing.

Its adaptability to different materials, pressure classes, and actuation methods makes it indispensable across industries ranging from municipal water to petrochemicals.

For engineers and procurement teams, selecting the right FBV involves evaluating media compatibility, operating conditions, performance metrics, and lifecycle costs.

With ongoing advances in materials and automation, flanged butterfly valves will remain a cornerstone of industrial flow control.

Custom Valves from DEZE Foundry

From water treatment plants and HVAC systems to oil & Գազատարներ, Քիմիական ռեակտորներ, and power generation networks, flanged butterfly valves deliver precise flow regulation and tight shutoff under demanding conditions.

Their quarter-turn operation, compact structure, and wide material options enable customization for specific fluids, ճնշումները, and temperatures.

As a professional valve foundry and supplier, we provide custom-engineered flanged butterfly valves and precision-cast components, meeting international standards (API, Iso, ANSI) while ensuring cost-effective performance.

Whether your project requires large-diameter high-pressure service, corrosion-resistant alloys, or optimized designs for maintenance efficiency, our manufacturing expertise ensures reliable solutions tailored to your industry.

Կապվեք մեզ հետ now！

ՀՏՀ

Can flanged butterfly valves handle high-pressure gas service?

Yes—double/triple eccentric flanged valves with metal seats (API 609 Class VI leakage) and ANSI Class 300–900 ratings are suitable for high-pressure gas (Է.Գ., natural gas, ազոտ).

Ensure compliance with ISO 15848-1 Class AH for low fugitive emissions.

What is the maximum size of a flanged butterfly valve?

Most manufacturers offer flanged butterfly valves up to 48 դյույմ (1200 մմ) in diameter, suitable for large water treatment plants and oil & Գազատարներ.

Custom designs can reach 60 դյույմ (1500 մմ) for specialized applications.

How do I prevent flange gasket leakage?

Use gaskets compatible with fluid/temperature (Է.Գ., graphite for steam, PTFE for chemicals); tighten bolts in a crisscross pattern (per ASME PCC-1) to uniform torque (Է.Գ., 70 N·m for 6-inch ANSI 300 եզրեր); replace gaskets annually.

Are flanged butterfly valves suitable for sanitary service?

Yes—select 316L bodies with electropolished surfaces (Ra ≤0,8 մկմ), PTFE seats, and tri-clamp flanges (3-A/EHEDG compliant).

These valves are used in dairy, ըմպելիք, and pharmaceutical manufacturing.

What is the difference between ANSI Class 300 մի քանազոր 600 flanged valves?

ANSI դաս 300 valves handle up to 70 bar (20° C), while Class 600 handles up to 140 bar (20° C).

Դասավորել 600 valves have thicker bodies (20–30 mm vs. 15–20 mm for Class 300) and stronger flanges, making them suitable for high-pressure applications like refineries and offshore pipelines.