Pilot-Operated Pressure Relief Valve
High-capacity relief valve using a pilot mechanism for accurate set-point operation in large pressure vessels and pipelines. HTS 8481.40.00.00 classification applies as it serves safety relief functions for industrial gas and steam systems.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for precise flow regulation in process lines
Gate or globe valves for throttling flow classify differently from emergency relief valves.
If for semiconductor gas delivery systems
Specialized valves for semiconductor manufacturing machines fall under chemical processing machinery.
If with integrated digital pressure deflection recording
Valves combined with recording instruments classify as gas pressure regulators in Chapter 90.
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Import Tips & Compliance
• API 526 flange standards documentation required; include orifice designation (D-K sizes); ensure pilot testing certification for customs validation
Related Products under HTS 8481.40.00.00
ASME Certified Pressure Relief Valve
A safety valve designed to automatically release excess pressure from boilers and pressure vessels to prevent explosions, featuring spring-loaded mechanism for precise set pressure. Classified under HTS 8481.40.00.00 as it functions specifically as a safety or relief valve for pipes, tanks, and boilers. Meets ASME standards for industrial steam systems.
Spring-Loaded Safety Valve for Air Compressors
Spring-loaded relief valve that pops open at predetermined pressure to vent excess air from compressor tanks, protecting against over-pressurization. Falls under HTS 8481.40.00.00 due to its dedicated safety relief function for compressed air systems in industrial pipes and tanks.
Thermal Relief Valve for Hot Water Heaters
Valve that relieves pressure buildup from thermal expansion in hot water storage tanks, preventing tank rupture. Classified in HTS 8481.40.00.00 as a safety relief valve for water heating systems and pressure vessels.
Stainless Steel Safety Valve for Chemical Tanks
Corrosion-resistant stainless steel relief valve for hazardous chemical storage tanks, discharging vapors or liquids at overpressure. Meets HTS 8481.40.00.00 as safety valve for chemical processing tanks and vessels.
Full Lift Safety Valve for Steam Boilers
Full-lift pop-type safety valve providing maximum discharge area for rapid steam relief from industrial boilers. Classified under HTS 8481.40.00.00 for its critical safety function in boiler shells and pressure piping.
Cryogenic Relief Valve for LNG Tanks
Low-temperature safety valve for liquefied natural gas storage tanks, relieving boil-off gas during overpressure events. HTS 8481.40.00.00 applies to its safety relief role in cryogenic pressure vessels.