Specification

DN50 PN16 SS304/316 Three Eccentric Hard Seal Electric Flange Butterfly Valve

I. Product Overview

TIANYU three eccentric hard seal electric flange butterfly valve is a precision-engineered flow control solution tailored for high-temperature and medium-pressure industrial systems. Crafted with stainless steel (SS304/316) and featuring a three eccentric structure, it combines metal-to-metal hard sealing with electric actuation to ensure reliable shut-off and regulation of diverse media—from water and oil to steam and asphalt. Designed for versatility, it adapts to temperatures from -20°C to 100°C and pressures up to PN6.4MPa, making it ideal for petroleum, chemical, food & beverage, and water treatment industries. Backed by ISO 9001 and CE certifications, it balances durability, automated precision, and corrosion resistance for critical process control.

II. Key Attribute Parameters

Size Range: DN15 ~ DN100 (1/2″ ~ 4″), covering small to medium-diameter pipelines for precise flow control in compact systems.
Pressure Range: PN1.0 ~ 6.4MPa, engineered to handle low to high pressure loops, from municipal water lines to industrial process pipelines.
Temperature Range: -20°C ~ 100°C, suitable for media with moderate temperature fluctuations, including hot water, steam, and asphalt.
Material Configuration:
- Body & Disc: SS304/316 stainless steel, offering corrosion resistance to water, chemicals, and mild acids; SS316 enhances chloride resistance for coastal or brine applications.
- Seal: Metal hard seal (body-sealed), ensuring tight shut-off under high temperatures where rubber seals degrade.
- Stem: Stainless steel (304), resisting rust and ensuring smooth rotation under pressure.
- Actuator: Electric (switching/regulating/intelligent type), with voltage options: DC24V, DC220V, AC110V, AC220V, AC380V.
Connection Type: Flange (per DIN/ANSI standards), enabling secure integration with pipeline flanges for leak-tight performance.
Service Life: 1,500,000+ cycles, ensuring long-term reliability in continuous-operation systems.

Product Overview

III. Features Description

Three Eccentric Structure: The disc, stem, and sealing surface are designed with three distinct eccentricities, eliminating contact between the disc and seat during opening/closing. This reduces wear, extends seal life, and achieves ANSI/FCI Class V leakage (near-zero) even after 1 million cycles—critical for asphalt and steam systems where leakage risks contamination or energy loss.
Metal Hard Seal: Precision-machined metal sealing surfaces (Ra ≤0.8μm) form a tight bond under pressure, resisting deformation at high temperatures (up to 100°C). Unlike rubber seals, it avoids swelling or degradation in oil, asphalt, or chemical media.
Electric Actuation Versatility: Equipped with three actuator types:
- Switching type: Full open/close operation for on-off control in pipelines like water distribution.
- Regulating type: Adjustable opening angle (0~90°) via signal input, ideal for precise flow control in chemical dosing systems.
- Intelligent type: Integrated smart modules for temperature/pressure feedback, enabling automated process adjustment in complex loops.
Stainless Steel Durability: SS304/316 body resists corrosion from water, steam, and mild chemicals, while its robust forging ensures structural integrity under PN6.4MPa pressure—eliminating rust-related failures in humid or industrial environments.
Flange Connection: Bolted flange design ensures alignment with standard pipelines (DIN/ANSI), simplifying installation and reducing leakage risks compared to wafer-type valves in high-pressure applications.

IV. Manufacturing Processes

Material Preparation: SS304/316 slabs undergo ultrasonic testing to detect internal defects. Spectral analysis verifies alloy composition (Cr18-20% for SS304; Cr16-18%, Mo2-3% for SS316) to ensure corrosion resistance.
Three Eccentric Machining: CNC lathes precision-machine the disc, stem, and body to achieve three eccentricities (axial, radial, angular), with tolerances within ±0.03mm. This ensures the disc clears the seat during movement, minimizing friction.
Seal Surface Finishing: Metal seal surfaces are ground with diamond abrasives to Ra ≤0.8μm, then lapped under 500N pressure to ensure 100% contact—critical for hard seal leakage performance.
Actuator Integration: Electric actuators are mounted via a precision bracket, with stem-actuator alignment calibrated to ±0.5° to avoid jamming. Actuators undergo 5,000+ cycle tests to validate switching/regulating accuracy.
Performance Testing:
- Hydrostatic Test: Body tested at 1.5×rated pressure for 30 minutes to verify structural integrity.
- Leakage Test: Metal seal tested with air at PN1.6MPa, achieving ANSI/FCI Class V leakage (≤0.001% of flow).
- Cycle Test: 100,000+ open/close cycles to confirm durability of seals and actuator.

Valve Details

V. Product Advantages

Superior Sealing Reliability: Three eccentric design + metal hard seal ensures near-zero leakage, even under high temperatures—ideal for asphalt or steam systems where rubber-sealed valves fail.
Corrosion Resistance: SS304/316 construction resists rust and chemical attack, reducing maintenance costs by 40% compared to carbon steel valves in wet or chemical environments.
Automated Precision: Electric actuators (regulating/intelligent type) enable remote control and precise flow adjustment (±1° angle accuracy), enhancing process efficiency in automated lines.
Long Service Life: 1.5 million+ cycles and wear-resistant metal components extend replacement intervals, lowering lifecycle costs in continuous-operation industries like water treatment.
Versatile Compatibility: Adapts to diverse media (water, oil, steam, asphalt) and standards (DIN/ANSI), fitting seamlessly into global industrial pipelines.

Application

VI. Application Fields

Petroleum & Chemical: Regulates crude oil, asphalt, and chemical reactants in refineries and processing plants, leveraging metal seals to resist chemical erosion.
Food & Beverage: Controls clean water and steam flow in brewing, dairy, and packaging lines, with SS316 material ensuring compliance with food-grade standards.
Water & Wastewater: Manages municipal water distribution and wastewater treatment, where stainless steel resists corrosion from chlorine and contaminants.
Power & Boiler Systems: Handles low-pressure steam in auxiliary pipelines, with hard seals maintaining integrity under cyclic temperature changes.
Mining & Pulp: Controls slurry and process water flow, using SS316 to withstand abrasive particles and mineral-rich media.