Ductile Iron Silent Check Valve
Ductile iron silent check valve designed to minimize water hammer with a spring-assisted disc for quiet operation in HVAC piping systems. It qualifies under HTS 8481.30.20.10 as an iron nonreturn appliance for boilers and tanks.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If safety or relief function
Pressure-relief check valves have separate headings from standard nonreturn.
If for semiconductor processing
Certain valves for cleanroom fabs classify under specialized exclusions.
If with integrated level control
Combined valve and liquid level regulators move to instruments chapter.
Not sure which classification is right?
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Import Tips & Compliance
• Specify ASTM A536 grade in certifications to prove ductile iron properties
• Include installation orientation diagrams to confirm pipe appliance use
• Avoid pitfall of classifying with insulation as a complete system component
Related Products under HTS 8481.30.20.10
Iron Swing Check Valve
A swing-type check valve made entirely of cast iron, featuring a hinged disc that swings open with forward flow and closes to prevent backflow in piping systems. Classified under HTS 8481.30.20.10 as a nonreturn valve of iron, designed for use in water, wastewater, or industrial pipelines to protect pumps and equipment from reverse flow.
Cast Iron Lift Check Valve
Cast iron lift check valve with a piston-like disc that lifts vertically to allow flow and drops to seal against backflow, ideal for horizontal or vertical installations in plumbing systems. It falls under HTS 8481.30.20.10 due to its iron construction and nonreturn design for pipes and tanks.
Iron Foot Check Valve
Cast iron foot check valve with integral strainer for well pump suction lines, combining filtration and backflow prevention. Under HTS 8481.30.20.10 as an iron nonreturn appliance for tanks and pipes.
Iron Spring Loaded Check Valve
Spring-loaded cast iron check valve for quick response in variable flow pumping systems, ideal for sewage ejector applications. Classified HTS 8481.30.20.10 as iron nonreturn for tanks.
Malleable Iron Check Valve
Malleable cast iron check valve with superior ductility for vibration-prone HVAC ducts, preventing air backdraft. HTS 8481.30.20.10 for iron pipe appliances.
Iron Disc Check Valve for Boilers
Heavy cast iron disc check valve rated for boiler feedwater lines, ensuring no steam backflow into feed pumps. Under HTS 8481.30.20.10 explicitly for boiler shells.