Specification

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

I. Product Overview

Newway 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.