Brass Diaphragm Check Valve for Crystal Grinder Coolant
A brass diaphragm check valve designed for coolant systems in crystal grinders that shape semiconductor boules. It provides zero-leakage, unidirectional flow at pressures exceeding 850 kPa, ensuring precision during wafer preparation. Classified under tariff item 8481.30.00 as a check (nonreturn) valve of copper alloy.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the valve is not specifically a check (nonreturn) type
Other taps, cocks, valves and similar appliances not elsewhere specified fall under this residual heading.
If imported as parts of valves rather than complete valves
Parts of valves are classified separately under this heading.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Ensure the valve's pressure rating (over 850 kPa) is documented in the commercial invoice to support classification under 8481.30.00
• Verify the copper alloy composition with a mill certificate, as valves of other materials may fall under different tariff items
• Declare the end-use in semiconductor manufacturing to facilitate CBSA review
Related Products under Tariff item 8481.30.00
Brass Inline Check Valve 1/4 Inch
> A compact 1/4-inch brass inline check valve for refrigerant lines and compressed air systems under low pressure, with ball or poppet mechanism. It is a nonreturn valve for pipes, classified under tariff item 8481.30.00.
Brass Non-Return Valve for Crystal Puller Gas Systems
A brass non-return valve rated above 850 kPa for argon or nitrogen gas lines in Czochralski crystal pullers. It ensures unidirectional gas flow to maintain ultra-pure monocrystalline silicon boule growth. Classified under tariff item 8481.30.00 as a check valve of copper alloy.
Brass Silent Check Valve 2 Inch
> A 2-inch brass silent check valve with cushioned disc closure to reduce water hammer in larger low-pressure water mains. It is a nonreturn valve for water distribution, classified under tariff item 8481.30.00.
Brass Swing Check Valve 1/2 Inch
> A 1/2-inch brass swing check valve designed to prevent backflow in low-pressure plumbing systems, featuring a hinged disc that swings open with forward flow and closes against reverse flow. It is a nonreturn valve, classified under tariff item 8481.30.00.
Bronze Horizontal Check Valve 3/8 Inch
> A 3/8-inch bronze horizontal inline check valve for fuel oil lines and low-pressure gas applications, oriented for horizontal piping. It is a nonreturn valve for pipes, classified under tariff item 8481.30.00.
Bronze Lift Check Valve 1 Inch
> A 1-inch bronze lift check valve where the disc lifts vertically in the flow direction and drops to seal against backflow, used in low-pressure air and water systems. It is a nonreturn valve, classified under tariff item 8481.30.00.