III. Structural Features

• Triple Eccentric Design: Three offsets minimize friction between the disc and seat during 90° of operation, ensuring the disc tightens as it closes. For DN250, this reduces wear and ensures bubble-tight shut-off—critical for preventing high-temperature media leakage.
• Pneumatic Actuation: The ATD-160 actuator delivers sufficient torque to operate DN250 valves efficiently, enabling rapid response to process changes (e.g., steam flow adjustments in power plants).
• Hard Sealing Structure: Metal-to-metal sealing surfaces (Ra ≤0.8μm) resist oxidation and wear, maintaining integrity even after 100,000+ cycles in high-temperature environments.
• Stainless Steel Build: Low thermal expansion coefficient minimizes deformation under temperature fluctuations, ensuring consistent performance in DN250 pipelines handling hot media.
• Optimized Flow Path: Streamlined disc design reduces pressure drop by 15% compared to standard valves, improving energy efficiency in large-diameter systems.

IV. Manufacturing Processes

• Material Inspection: DN250 stainless steel castings undergo spectral analysis (304: 18-20% Cr) and ultrasonic testing to eliminate internal defects, ensuring high-temperature stability.
• Precision Machining: CNC grinders shape the triple eccentric disc and body to ±0.05mm tolerances, critical for DN250’s sealing accuracy. Eccentric parameters are calibrated via 3D measurement.
• Seal Enhancement: Metal sealing surfaces receive Stellite coating (hardness ≥55 HRC) via plasma spraying, then are lapped for uniform contact with the disc.
• Actuator Integration: The ATD-160 actuator is mounted via an ISO 5211 flange, ensuring precise alignment with the DN250 valve stem. Actuators undergo torque and response testing.
• Performance Validation: Each DN250 valve undergoes hydrostatic tests (2.4MPa) and high-temperature seal tests (400℃ steam) to confirm zero leakage and structural integrity.