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Double Flange Double Eccentric Butterfly Valve Manual Large Size 2-Way Soft Seal Butterfly Valve

port size:DN100–DN4000

structure:BUTTERFLY

application:Industry

power:Manual electric

customized support:OEM, ODM, OBM

temperature of media:Medium/Normal Temp

media:Water

Product name:Flanged Butterfly Valve

Seal Material:EPDM\NBR\PTFE(F4) \PFA

Application:Water Industrial Usage

Body material:Ductile Iron

Applicable medium:Water Gas Oil Air

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Description

Specification

TIANYU Double Flange Double-Offset Butterfly Valve: Customized Solution for Industrial Fluid Control

I. Product Overview

As a key device for precise flow regulation and reliable shut-off in industrial pipeline systems, the TIANYU double flange double-offset butterfly valve features an innovative double-offset structure, constructed from high-performance materials like ductile iron, cast steel, and stainless steel, paired with manual, electric, or pneumatic drive systems for versatile complex applications. With a diameter range of DN100-DN4000 (4″-160″) and PN10 pressure rating (Class 150LB), it stably controls media such as water, gases, and oil products within -20°C-120°C, complying with standards like GB/T 12238 and API 609. It serves as an ideal choice for municipal water supply/drainage, chemical, power, and metallurgical sectors.

II. Core Features: Double-Offset Technology and Sealing Innovation

Double-Offset Structural Design
- Eccentric Principle: The stem axis deviates from both the seat centerline and disc plane (radial offset 2-3mm, angular offset 5°), enabling the disc to disengage from the seat rapidly when opening, reducing seal surface friction by 60% compared to ordinary butterfly valves and extending service life significantly.
- Bidirectional Sealing: Combining elastic soft seals (EPDM/NBR/PTFE) with metal support structures achieves bidirectional bubble-tight sealing (leakage ≤0.01×DN mm³/s) without distinguishing media flow direction.
- Torque Optimization: The double-offset design reduces opening/closing torque by 40%, with manual operating torque for DN1000 ≤800N·m, suitable for large-diameter pipeline requirements.
Diversified Sealing System
- EPDM Seal: Resistant to -20°C-120°C warm water and air, suitable for municipal water supply/drainage and air conditioning systems.
- NBR Seal: Resistant to -40°C-100°C oil products, suitable for refinery circulating oil pipelines.
- PTFE Seal: Resistant to -100°C-260°C strong acids and alkalis, suitable for chemical reactor inlet/outlet control.
Flexible Drive Configuration
- Manual Worm Drive: Equipped with a gear reduction mechanism and optimized operation arm for easy opening/closing of large-diameter valves.
- Electric Actuator: Supports 4-20mA analog regulation, IP65 protection, and explosion-proof type complying with Ex d IIBT4 standards.
- Pneumatic Actuator: Optional double-acting/single-acting, response time ≤1.2 seconds, with spring return function for safety.

III. Key Attributes: Technical Parameters and Standard Compliance

Attribute Category	Specific Parameters
Diameter Range	DN100-DN4000 (4″-160″), supporting non-standard customization (max DN5000)
Pressure Rating	PN10 (1.0MPa), compliant with ASME B16.5 and EN 1092-1 flange standards
Body Material	QT450-10 ductile iron, WCB cast steel, CF8 (304)/CF8M (316) stainless steel, customizable to duplex steel 2205
Connection Type	Double flanged (RF raised face), bolt spacing compliant with GB/T 9113 and ANSI B16.5
Manufacturing Standards	Design: GB/T 12238, API 609; Testing: GB/T 13927, ISO 5208; Certifications: CE, TSG
Suitable Media	Clean water, sewage, air, natural gas, light oil products, weak acid-base solutions (pH 4-10)

Product Overview

IV. Manufacturing Processes: Precision Control from Material to Finished Product

Material Forming and Treatment
- Ductile Iron Melting: Using cupola-electric furnace dual process, adding rare earth magnesium alloy nodulizer to ensure nodulization rate ≥90%, graphite sphere diameter ≤0.05mm, and annealing at 900°C to eliminate internal stress, tensile strength ≥450MPa.
- Stainless Steel Casting: 304 material melted in vacuum induction furnace, passing intergranular corrosion test (ASTM A262 E method), with castings solution quenched at 1050°C to achieve grain size ≥Grade 5.
- Surface Treatment: Valve body sandblasted to Sa2.5, sprayed with epoxy powder (thickness ≥200μm), passing salt spray tests ≥1000 hours without rust.
Precision Machining and Assembly
- 5-Axis Machining: Disc and seat sealing surfaces processed by CNC grinder to surface roughness Ra≤0.8μm, flatness error ≤0.02mm, forming high-precision seal pairs.
- Stem Treatment: 2Cr13 stainless steel stem quenched and tempered (HRC28-32), chrome-plated 0.03mm for 5x wear resistance, ensuring 100,000 cycles without jamming.
- Assembly Testing: Each valve undergoes 1.5x nominal pressure shell testing (1.5MPa) and 1.1x seal testing (1.1MPa), holding pressure for 15 minutes without leakage.
Quality Control System
- Nondestructive Testing: 100% ultrasonic testing (UT) for DN≥500 valves, magnetic particle inspection (MT) for key welds.
- Material Certification: Each batch of steel provides spectral analysis reports and tensile test data (e.g., QT450-10 yield strength ≥310MPa).
- Life Testing: Sampling for 50,000 cycle tests, seal wear ≤0.1mm, torque decay ≤10%.

Valve Details

V. Product Advantages: Core Value in Industrial Scenarios

Long Service Life and Low Maintenance
The double-offset structure reduces seal wear. A DN1200 butterfly valve in a municipal project operated for 8 years without seal replacement, extending maintenance cycles by 3 times and decreasing annual costs by 60%. Ductile iron body weight is 25% lighter than cast steel, reducing installation costs by 30%.
Full-scenario Customization
- Diameter Customization: Full coverage of DN100-DN4000, with split disc design for DN2000+ to solve casting challenges.
- Condition Adaptation:
  - Seawater systems: 316L stainless steel + fluoroelastomer seal, resistant to Cl⁻≤3000ppm.
  - Dust environments: Tungsten carbide-coated discs, wear rate ≤0.01mm/year.
  - Cryogenic LNG: LCB low-temperature steel + nickel-based alloy seal, stable operation at -196°C.
Cost-Efficiency Balance
- Initial Investment: Double flange design costs 15% less than lug type, with DN1000 models offering a price advantage of ¥20,000.
- Operation Efficiency: Electric actuator power is 20% lower than similar products, achieving ±1% regulation accuracy with smart positioners.
- Installation Convenience: Flange connection compatible with multiple standards, reducing on-site installation time by 40% compared to wafer type.
Global Service Support
Exported to 30+ countries, validated in Kazakhstan water transmission projects and Saudi oilfield associated gas pipelines. Providing 7×24-hour technical response, overseas warehouses stocking DN100-DN600 regular accessories, and emergency orders delivered within 48 hours.

Application

VI. Application Fields: In-depth Industry Coverage

Municipal Engineering
- Sectional control for urban water main pipes, DN2000 models used in South-North Water Diversion supporting projects.
- Aeration tank air volume regulation in wastewater treatment plants, EPDM seals resisting ozone corrosion.
Petrochemical Industry
- Circulating oil pipelines in refinery atmospheric-vacuum units, NBR seals resisting 100°C light oil products.
- Acid-base storage tank inlet/outlet in chemical parks, PTFE seals resisting 98% sulfuric acid.
Power Energy Sector
- Circulating water system (DN1600) flow distribution in thermal power plants, pneumatic actuators enabling automatic regulation with DCS systems.
- Fuel gas pipeline fast shut-off for gas turbines, electric actuator response time ≤1 second.
Metallurgy and Mining
- Blast furnace gas pipeline shut-off (dust content ≤50mg/m³), wear-resistant coated discs reducing dust jamming.
- Mineral slurry transportation in concentrators (solid particles ≤30μm), ductile iron body offering outstanding cost-performance.

Our Strengths

Best Quality Industrial Valve Solutions For You

QUALITY WARRANTY

A warranty of 18 months after delivery or 12 months after installation is provided by TianYu for all supplied valves.

FAST LEAD TIME

General lead time is around 8 weeks(conventional valves) with high efficient production process and regular expedition procedure.

COST-EFFECTIVE PRICE

With A quality but cost-effective supply chain, we offer client with reasonable price and low aftersales cost, to build a healthy and long term partnership.

VALUE ADDED SERVICE

From early bidding to final shipment we have a professional team standby to support client on commercial, technical, quality and transportation issues.

Industrial Applications

Petrochemical Industry

In the petrochemical industry, valves are used to control fluid flow, pressure, and prevent accidents. They are capable of enduring high temperatures and pressures in refinery environments, ensuring safe and smooth operation of processes.

Power Industry

In the power industry, valves are used to control the flow of steam, water, and oil. Globe valves and gate valves in steam pipelines ensure smooth steam transportation, while butterfly valves are commonly used to regulate flow.

Food & Beverage Industry

In the food and beverage industry, valves are used for fluid transportation and control. These valves need to meet sanitary standards to ensure the safety and quality of food products.

Environmental Protection Sector

In the environmental protection sector, valves are used in wastewater treatment systems to control the discharge of sewage, ensuring the effectiveness of wastewater treatment. They play an important role in environmental protection and sustainable development.

Factory Capacity

China Professional Valve Manufacturer & Supplier

Years

Production Equipments

Manufactuing Area

0 m²

Annual Production Value

$ 0

Double Flange Double Eccentric Butterfly Valve Manual Large Size 2-Way Soft Seal Butterfly Valve

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Double Flange Double Eccentric Butterfly Valve Manual Large Size 2-Way Soft Seal Butterfly Valve

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Specification

TIANYU Double Flange Double-Offset Butterfly Valve: Customized Solution for Industrial Fluid Control

I. Product Overview

II. Core Features: Double-Offset Technology and Sealing Innovation

III. Key Attributes: Technical Parameters and Standard Compliance

Product Overview

IV. Manufacturing Processes: Precision Control from Material to Finished Product

Valve Details

V. Product Advantages: Core Value in Industrial Scenarios

Application

VI. Application Fields: In-depth Industry Coverage

Our Strengths

Best Quality Industrial Valve Solutions For You

QUALITY WARRANTY

FAST LEAD TIME

COST-EFFECTIVE PRICE

VALUE ADDED SERVICE

Industrial Applications

Petrochemical Industry

Power Industry

Food & Beverage Industry

Environmental Protection Sector

Factory Capacity

China Professional Valve Manufacturer & Supplier

Honor

Certification

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