ASCO 551 Series Proportional Solenoid Control Valve from Germany
This pneumatic actuator-equipped control valve modulates flow precisely based on electrical signals from a PLC in semiconductor wafer processing systems. It falls under HTS 8481.80.9035 due to its design for proportional operation by a control device signal, specifically for gas delivery in crystal growers. Used in Czochralski pullers to maintain stable pressure during silicon boule formation.
Duty Rate — Germany → United States
12%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Verify pneumatic actuator specifications and signal compatibility (4-20mA or 0-10V) match US safety standards like UL or CSA for semiconductor equipment
• Include detailed flow curves and Cv values in documentation to prove proportional control function and avoid misclassification as simple on/off valves