Electro-Pneumatic Proportional Valve for Crystal Puller Gas Control from Mexico
Designed for Czochralski crystal growers, this proportional valve modulates argon gas flow based on real-time signals from temperature controllers during silicon boule pulling. Classified in 8481.80.9020 for its electro-pneumatic actuator responding proportionally to control signals in semiconductor material growth equipment. Ensures ultra-precise atmosphere control to prevent crystal defects.
Duty Rate — Mexico → United States
12%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Provide process flow diagrams showing valve integration in crystal growth systems to support 8481 classification over semiconductor machinery notes
• Declare flow rate range (e.g
• 0-100% proportional) and signal input specs (4-20mA) explicitly to distinguish from binary valves