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
10%
Rate breakdown
9903.05.3910%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.97, articles the product of a member state of the European Union, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 10 percent, as provided for in U.S. note 52 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