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DN500 Pneumatic Motorized Double Eccentric butterfly Valve Pn16 High-Performance Double-Offset Butterfly Valve

structure:BUTTERFLY

application:General

power:Manual

customized support:OEM, ODM, OBM, Software reengineering

applicable medium:Water, Air, Gas, Oil, sTEAM, Chemicals

Product name:butterfly valve weco butterfly valves

Keyword:metal seal butterfly valve

Calibration range:DN50~DN4000

Pressure level:1.0~2.5MPa

Temperature range:0℃~80℃

Transmission mode:Manual, electric, pneumatic, bevel gear

Applicable media:Water, steam, gas, oil, etc

Main material:QT450WCB, CF8

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Description

Specification

TIANYU High-Performance Double-Offset Butterfly Valve: All-round Solution for Industrial Fluid Control

I. Product Overview

As a core device for precise flow regulation and reliable shut-off in industrial pipeline systems, the TIANYU high-performance double-offset butterfly valve features an innovative double-offset structure, constructed from high-performance materials such as ductile iron, cast steel, and stainless steel, paired with electric, pneumatic, or manual drive systems for versatile complex applications. With a diameter range of DN50-DN1200 (2″-48″) and pressure ratings of PN10-PN40 (Class 150-600LB), it stably controls media like water, steam, oil, gas, and acid-base solutions within -40°C-400°C, complying with international standards such as API 609, EN 593, and GB/T 12238. It serves as an ideal choice for petrochemical, power energy, municipal water supply/drainage, and metallurgical mining sectors.

II. Core Features: Double-Offset Technology and Full-condition Adaptability

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 significantly extending service life.
- Bidirectional Sealing: Combining metal hard seal (Stellite overlay welding) with elastic soft seal (EPDM/NBR/PTFE) achieves bidirectional bubble-tight sealing (API 598 standard leakage ≤0.01×DN mm³/s) without distinguishing media flow direction.
- Torque Optimization: The double-offset design reduces opening/closing torque by 40%, with pneumatic actuation torque for DN300 ≤120N·m, suitable for low-power drive systems and delivering significant energy savings.
Diversified Material System
- Ductile Iron (QT450-10): Tensile strength ≥450MPa, elongation ≥10%, suitable for normal-temperature low-pressure conditions (e.g., municipal water supply/drainage), with epoxy coating thickness ≥200μm passing salt spray tests ≥1000 hours.
- Cast Steel (WCB): Yield strength ≥250MPa, resistant to 425°C high-temperature steam, applicable to high-temperature/high-pressure scenarios in thermal power plants and refineries.
- Stainless Steel (304/316): Containing 18% chromium and 8% nickel (316 with 2% molybdenum), offering 8x higher chloride corrosion resistance than carbon steel, suitable for seawater and chemical media.
Intelligent Drive and Control
- Actuator Configuration: Electric actuators support 4-20mA analog regulation, with IP68 protection and explosion-proof type complying with Ex d IIBT4 standards; pneumatic actuators respond within ≤0.8 seconds with spring return function.
- Remote Monitoring: Integrated with communication protocols like Modbus/TCP and Profibus DP, enabling real-time position feedback, fault diagnosis, and remote control via SCADA systems.
- Manual Backup: Equipped with worm gear manual mechanism, allowing easy switching to manual operation during power outages or failures to ensure system safety.

III. Key Attributes: Technical Parameters and Standard Compliance

Attribute Category	Specific Parameters
Diameter Range	DN50-DN1200 (2″-48″), supporting non-standard customization (max DN2000)
Pressure Rating	PN10/16/25/40 (Class 150/300/600/900LB), compliant with ASME B16.34 pressure-temperature ratings
Body Material	QT450-10 ductile iron, WCB cast steel, CF8 (304)/CF8M (316) stainless steel, duplex stainless steel 2205 (optional)
Seal Material	Main seal: Stellite (metal hard seal); Auxiliary seal: EPDM (-20°C-120°C), NBR (-40°C-100°C), PTFE (-100°C-260°C)
Connection Type	Wafer, Flange, Lug, compliant with ANSI B16.5 and DIN EN1092-1 standards
Actuation Method	Electric (intelligent), pneumatic (double-acting/single-acting), manual (worm gear), supporting explosion-proof/fire-safe customization
Manufacturing Standards	Design: API 609, EN 593, GB/T 12238; Testing: API 598, ISO 5208; Certifications: CE, TSG A1 grade
Suitable Media	Clean water, sewage, steam, gas, crude oil, acid-base solutions (pH 2-12), particle-containing media (≤50μm particle size)

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.
- Stainless Steel Casting: Vacuum induction melting, 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 AkzoNobel epoxy powder ≥200μm thick, adhering to ISO 2409 cross-cut test Grade 0.
Precision Machining and Assembly
- 5-Axis Machining: Disc and seat sealing surfaces processed by CNC grinder to surface roughness Ra≤0.4μm, flatness error ≤0.01mm, forming high-precision seal pairs.
- Stem Treatment: 2Cr13 stainless steel stem quenched and tempered (HRC28-32), chrome-plated 0.03-0.05mm for 5x wear resistance, ensuring 100,000 cycles without jamming.
- Actuator Calibration: Each valve undergoes 1.1x nominal pressure opening/closing test, with drive system and body matching accuracy ≤±0.5° to guarantee control precision.
Full-process Quality Control
- Material Certification: Each batch of steel provides spectral analysis, tensile test (e.g., WCB yield strength ≥250MPa), and impact toughness reports (-20°C impact energy ≥27J).
- Pressure Testing: Shell tested at 1.5x nominal pressure (e.g., 2.4MPa for PN16) for 15 minutes; seal testing at 1.1x nominal pressure with zero bidirectional leakage.
- Life Verification: 100,000 cycle tests ensure seal wear ≤0.05mm and torque decay ≤8%, far exceeding industry standards.

Valve Details

V. Product Advantages: Core Value in Industrial Scenarios

Long Service Life and Low Maintenance Costs
The double-offset structure reduces seal wear. A DN600 butterfly valve in a wastewater treatment plant operated for 10 years without seal replacement, extending maintenance cycles by 3 times and decreasing annual costs by 50%. Ductile iron body weight is 20% lighter than cast steel, reducing installation expenses.
Full-condition Adaptability
- Temperature Range: -40°C low-temperature LNG pipelines (LCB low-temperature steel) to 400°C high-temperature thermal oil systems (WCB cast steel + metal hard seal), covering wide temperature ranges through material combinations.
- Media Compatibility: 316 stainless steel body resists seawater (Cl⁻≤2000ppm), duplex steel 2205 withstands sour crude oil (pH≥4), meeting requirements of multiple industries.
Customized Solutions
- Industry-specific Customization:
  - Food & pharmaceutical: 316L stainless steel + FDA-certified PTFE seal supporting CIP/SIP online cleaning.
  - Nuclear auxiliary systems: Compliant with ASME BPVC Section III, offering 1E-level seismic design.
  - Metallurgy & mining: Wear-resistant tungsten carbide-coated discs for gas pipelines with dust content ≤50mg/m³.
- Functional Expansion: Special designs including fire-safe (API 607 certified), H₂S-resistant (NACE MR0175), and cryogenic (-196°C liquid nitrogen dedicated) to meet harsh conditions.
Global Service Support
Exported to 60+ countries, validated in Middle Eastern refineries (500°C high-temperature cracking gas), European drinking water projects (WRAS certified), and Southeast Asian offshore platforms (seawater corrosion environments). Providing 7×24-hour technical response, overseas warehouses covering major ports, regular accessories delivered within 48 hours, and emergency orders expedited via multi-line production.

Application

VI. Application Fields: In-depth Industry Coverage

Petrochemical Industry
- Flow regulation for oil-gas pipelines in atmospheric-vacuum distillation units, metal hard seals resisting coking and high-temperature erosion.
- Reactor inlet/outlet control in chemical plants, 316 stainless steel resisting organic solvents like methanol and benzene.
Power Energy Sector
- Flow distribution for circulating water systems (DN1000) in thermal power plants, pneumatic actuators enabling automatic regulation with DCS systems.
- Nuclear power plant auxiliary pipelines, duplex steel bodies meeting nuclear-grade water quality requirements for safe operation.
Municipal Environmental Protection
- Sectional shut-off for urban water main pipes, ductile iron body offering cost-effectiveness, surface coating compliant with drinking water standards.
- Aeration systems in wastewater treatment plants, EPDM seals resisting ozone corrosion for precise air flow regulation.
Metallurgy and Mining
- Fast shut-off for blast furnace gas pipelines, wear-resistant seals reducing dust jamming to ensure safe production.
- Mineral slurry transportation in concentrators, tungsten carbide-coated discs extending service life by 3 times and reducing downtime.

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

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