Chapter 84 covers nuclear reactors, boilers, machinery and mechanical appliances and parts thereof, and is one of the chapters with the broadest commodity scope and highest technical density in the HS classification. This chapter includes power machinery, pumps, compressors, valves, bearings, transmission devices, industrial robots and other types of mechanical equipment, but excludes electrical equipment (Chapter 85), vehicles (Chapter 87) and optical instruments (Chapter 90). As a key safety accessory of pressure vessels, safety valves are classified in this chapter because of their mechanical operating principle and general industrial attributes. Heading 8481 specifically covers taps, cocks, valves and similar appliances for pipes, boilers, tanks, vats or the like, including pressure-reducing valves and thermostatically controlled valves. This heading includes both manually operated valves and automatic valves; it also includes valves made of metal as well as those made of plastics, ceramics and other materials. However, valves for internal combustion engines (such as intake valves and exhaust valves) are classified in 8409 or 8408, etc., before 8481, while fire hydrants, etc., are listed separately. As a type of automatic valve, the safety valve is an important commodity under this heading. Code 848140 is a six-digit subheading: the first 2 digits "84" represent Chapter 84 (machinery and mechanical appliances and parts thereof); digits 3-4 "81" represent heading 8481 (valves and similar appliances); digits 5-6 "40" represent subheading 848140, specifically referring to safety valves or pressure-reducing valves. In the HS classification, safety valves and pressure-reducing valves share the same subheading because their functions are similar (both are used for pressure control), but the core function of a safety valve is overpressure protection, while a pressure-reducing valve is used to stabilize outlet pressure. If it is another valve (such as a check valve or relief valve), it is classified under other subheadings of 8481. Safety valves are classified under 848140 rather than other valve subheadings because their core function is to open automatically to release pressure when the system pressure exceeds a set value, thereby protecting equipment safety, which conforms to the subheading description of "safety valves or pressure-reducing valves." Unlike 848120 (hydraulic or pneumatic transmission valves), safety valves are not used to control the movement of actuators; unlike 848130 (check valves), safety valves have adjustable pressure settings and automatic reset functions. Therefore, 848140 is the only correct classification for safety valves.
Chapter
Chapter 84 covers nuclear reactors, boilers, machinery and mechanical appliances and parts thereof, and is one of the chapters with the broadest commodity scope and highest technical density in the HS classification. This chapter includes power machinery, pumps, compressors, valves, bearings, transmission devices, industrial robots and other types of mechanical equipment, but excludes electrical equipment (Chapter 85), vehicles (Chapter 87) and optical instruments (Chapter 90). As a key safety accessory of pressure vessels, safety valves are classified in this chapter because of their mechanical operating principle and general industrial attributes.
Heading
Heading 8481 specifically covers taps, cocks, valves and similar appliances for pipes, boilers, tanks, vats or the like, including pressure-reducing valves and thermostatically controlled valves. This heading includes both manually operated valves and automatic valves; it also includes valves made of metal as well as those made of plastics, ceramics and other materials. However, valves for internal combustion engines (such as intake valves and exhaust valves) are classified in 8409 or 8408, etc., before 8481, while fire hydrants, etc., are listed separately. As a type of automatic valve, the safety valve is an important commodity under this heading.
Digit Breakdown
Code 848140 is a six-digit subheading: the first 2 digits "84" represent Chapter 84 (machinery and mechanical appliances and parts thereof); digits 3-4 "81" represent heading 8481 (valves and similar appliances); digits 5-6 "40" represent subheading 848140, specifically referring to safety valves or pressure-reducing valves. In the HS classification, safety valves and pressure-reducing valves share the same subheading because their functions are similar (both are used for pressure control), but the core function of a safety valve is overpressure protection, while a pressure-reducing valve is used to stabilize outlet pressure. If it is another valve (such as a check valve or relief valve), it is classified under other subheadings of 8481.
Classification Basis
Safety valves are classified under 848140 rather than other valve subheadings because their core function is to open automatically to release pressure when the system pressure exceeds a set value, thereby protecting equipment safety, which conforms to the subheading description of "safety valves or pressure-reducing valves." Unlike 848120 (hydraulic or pneumatic transmission valves), safety valves are not used to control the movement of actuators; unlike 848130 (check valves), safety valves have adjustable pressure settings and automatic reset functions. Therefore, 848140 is the only correct classification for safety valves.
📝 Declaration Elements
Product name: The standard name of the declared commodity should accurately reflect the valve type, such as "safety valve," "spring-loaded safety valve," etc., and avoid using colloquial names. Brand: Fill in the valve brand; if there is no brand, fill in "unbranded." The brand helps customs assess commodity value and intellectual property status. Model: Fill in the model set by the manufacturer, which should be consistent with the physical nameplate, to distinguish different specifications and performance. Material: Declare the main material of the valve body, such as cast steel, stainless steel, brass, etc. Material affects classification and tax rates. Pressure setting value: The opening pressure or set pressure range of the safety valve, usually expressed in MPa or bar, is a key technical parameter of the safety valve. Use: Explain the application scenario of the safety valve, such as "used for boiler overpressure protection," "used for pressure vessels," etc. Working principle: Briefly describe the automatic opening mechanism of the safety valve, such as "spring direct-loaded type," "pilot-operated type," etc. Product name: Spring-loaded safety valve; Brand: XX; Model: A28H-16C; Material: cast steel valve body, stainless steel disc; Pressure setting value: 1.6 MPa; Use: used for steam boiler overpressure protection; Working principle: spring direct-loaded type, automatically opens to release pressure when pressure exceeds the set value. Declaring a safety valve as a pressure-reducing valve by mistake; although both belong to 848140, their functions differ and this can easily trigger customs questioning. Ignoring the declaration of the pressure setting value, which is a key technical indicator distinguishing safety valves from ordinary valves. Material declaration is not specific, such as writing only "metal" without specifying the alloy, which may affect classification and customs valuation.
Product name
The standard name of the declared commodity should accurately reflect the valve type, such as "safety valve," "spring-loaded safety valve," etc., and avoid using colloquial names.
⚠️ Misdeclaring a safety valve as a "pressure-reducing valve" or "relief valve," leading to classification disputes.
Brand
Fill in the valve brand; if there is no brand, fill in "unbranded." The brand helps customs assess commodity value and intellectual property status.
⚠️ Omitting the brand or filling it in incompletely, such as writing only "domestic" instead of the specific trademark.
Model
Fill in the model set by the manufacturer, which should be consistent with the physical nameplate, to distinguish different specifications and performance.
⚠️ Incorrect model entry or inconsistency with the actual item, affecting customs inspection and subsequent traceability.
Material
Declare the main material of the valve body, such as cast steel, stainless steel, brass, etc. Material affects classification and tax rates.
⚠️ Writing only "metal" or "plastic," which is too general; it should be specific to the alloy type.
Pressure setting value
The opening pressure or set pressure range of the safety valve, usually expressed in MPa or bar, is a key technical parameter of the safety valve.
⚠️ Failing to fill in the set value or filling it in incorrectly, causing customs to question the function of the commodity.
Use
Explain the application scenario of the safety valve, such as "used for boiler overpressure protection," "used for pressure vessels," etc.
⚠️ Writing "industrial use" is too broad; it should be specific to the equipment or system.
Working principle
Briefly describe the automatic opening mechanism of the safety valve, such as "spring direct-loaded type," "pilot-operated type," etc.
⚠️ Describing the safety valve principle as "manual control," which is inconsistent with the facts.
Example： Product name: Spring-loaded safety valve; Brand: XX; Model: A28H-16C; Material: cast steel valve body, stainless steel disc; Pressure setting value: 1.6 MPa; Use: used for steam boiler overpressure protection; Working principle: spring direct-loaded type, automatically opens to release pressure when pressure exceeds the set value.
Common Mistakes：
Declaring a safety valve as a pressure-reducing valve by mistake; although both belong to 848140, their functions differ and this can easily trigger customs questioning.
Ignoring the declaration of the pressure setting value, which is a key technical indicator distinguishing safety valves from ordinary valves.
Material declaration is not specific, such as writing only "metal" without specifying the alloy, which may affect classification and customs valuation.
🎯 Classification Logic
The core basis for classification is the notes to Chapter 84 of the Harmonized Commodity Description and Coding System and the text of subheading 8481. A safety valve must meet the following: 1) be used for pipes, boilers, vessels, etc.; 2) open automatically when pressure exceeds a preset value; 3) be used to protect system safety. If a valve does not have automatic overpressure protection function, it cannot be classified under 848140. In addition, the definition of "safety valve" in the Explanatory Notes to the Harmonized System should be considered, excluding manual pressure relief valves, rupture discs and similar devices. 848110 Pressure-reducing valves: Pressure-reducing valves are used to reduce inlet pressure and stabilize it at a set outlet pressure, while safety valves are used to release pressure during overpressure. Their functions differ, but they share subheading 848140 and must be distinguished based on actual function. 848120 Hydraulic or pneumatic transmission valves: Transmission valves are used to control the direction, flow or pressure of fluid power actuators, usually controlled by external signals, while safety valves are automatic safety protection devices and do not participate in transmission control. 848130 Check valves: Check valves only allow fluid to flow in one direction and prevent backflow. They do not have pressure setting and overpressure release functions, and their principle and use differ from safety valves. 848180 Other valves: This subheading covers valves not elsewhere specified, such as ball valves, gate valves, butterfly valves, etc. These valves are usually manually or electrically controlled and do not have automatic overpressure protection functions. 848190 Parts of valves: Valve parts are components specially used for valves, such as valve bodies, bonnets, valve cores, etc., while safety valves are complete finished products and should be classified under 848140. Is the valve used for overpressure protection? Does it have automatic opening and reset functions? Can the pressure setting value be adjusted? Is it used for pipes, boilers or pressure vessels? Is it not a hydraulic or pneumatic transmission valve?
Basis
The core basis for classification is the notes to Chapter 84 of the Harmonized Commodity Description and Coding System and the text of subheading 8481. A safety valve must meet the following: 1) be used for pipes, boilers, vessels, etc.; 2) open automatically when pressure exceeds a preset value; 3) be used to protect system safety. If a valve does not have automatic overpressure protection function, it cannot be classified under 848140. In addition, the definition of "safety valve" in the Explanatory Notes to the Harmonized System should be considered, excluding manual pressure relief valves, rupture discs and similar devices.
Confused Codes：
848110 - Pressure-reducing valves
Pressure-reducing valves are used to reduce inlet pressure and stabilize it at a set outlet pressure, while safety valves are used to release pressure during overpressure. Their functions differ, but they share subheading 848140 and must be distinguished based on actual function.
848120 - Hydraulic or pneumatic transmission valves
Transmission valves are used to control the direction, flow or pressure of fluid power actuators, usually controlled by external signals, while safety valves are automatic safety protection devices and do not participate in transmission control.
848130 - Check valves
Check valves only allow fluid to flow in one direction and prevent backflow. They do not have pressure setting and overpressure release functions, and their principle and use differ from safety valves.
848180 - Other valves
This subheading covers valves not elsewhere specified, such as ball valves, gate valves, butterfly valves, etc. These valves are usually manually or electrically controlled and do not have automatic overpressure protection functions.
848190 - Parts of valves
Valve parts are components specially used for valves, such as valve bodies, bonnets, valve cores, etc., while safety valves are complete finished products and should be classified under 848140.
Self-Check：
✓ Is the valve used for overpressure protection?
✓ Does it have automatic opening and reset functions?
✓ Can the pressure setting value be adjusted?
✓ Is it used for pipes, boilers or pressure vessels?
✓ Is it not a hydraulic or pneumatic transmission valve?
❓ FAQ
Are both safety valves and pressure-reducing valves classified under 848140? How are they distinguished? Yes, safety valves and pressure-reducing valves share subheading 848140. The key to distinguishing them lies in function: a safety valve opens to release pressure when the system pressure exceeds the set value, protecting equipment; a pressure-reducing valve is used to reduce inlet pressure and stabilize it at the required outlet pressure. When declaring, fill in accurately according to the actual working principle and use to avoid confusion. How can I check the import tax rate for safety valves? The import tax rate for safety valves depends on the country of origin, trade agreements and customs policies. You can use the official website of the General Administration of Customs of China, the International Trade Single Window, or professional tariff query platforms, enter HS code 848140 and the country of origin, and obtain the most-favored-nation rate, agreement rate or general rate. Note that tax rates may change, and the latest published rates should prevail. What certifications are required for exporting safety valves? Exported safety valves usually need to comply with the safety certifications of the target market, such as the EU CE/PED Directive, US ASME/API standards, China's special equipment manufacturing license, etc. Specific certification depends on valve type, pressure rating and use. It is recommended to communicate with certification bodies in advance to ensure product compliance. What are common errors in the declaration elements for safety valves during customs declaration? Common errors include: misdeclaring safety valves as pressure-reducing valves or ordinary valves; omitting the pressure setting value; material declaration not being specific; incomplete brand and model entries; use description being too broad. These errors may lead to customs document review failure, inspection delays, or even classification disputes. Are HS codes for safety valves consistent across countries? The first six digits of the HS code, 848140, are basically consistent internationally, but countries may subdivide subsequent digits. For example, the US HTSUS is 8481.40.00, the EU TARIC is 8481.40.00, and China is 8481.40.00.00. When exporting, confirm the complete code of the destination country to comply with local declaration requirements. If a safety valve is part of a complete set of equipment, how should it be classified? If the safety valve is imported together with the main machine and constitutes a complete set of equipment, it should be classified according to the complete machine, such as a safety valve for a boiler being classified under 8402 with the boiler. If imported separately or as a spare part, it is classified under 848140. Classification of complete sets of equipment should refer to General Interpretative Rule 2(a) and the notes to the Harmonized System. How can I check tariff quotas or anti-dumping duties for safety valves? Safety valves generally do not have tariff quotas, but may involve anti-dumping duties. You can check through the website of the Trade Remedy and Investigation Bureau of the Ministry of Commerce of China, announcements of the General Administration of Customs, or professional trade compliance databases. If anti-dumping is involved, documents such as certificates of origin must be provided, and a deposit may be required. What should be noted when selling safety valves via cross-border e-commerce? When selling safety valves via cross-border e-commerce, note: 1) confirm that the product complies with the destination country's safety standards; 2) accurately declare the HS code and value; 3) understand the difference between personal items and commercial goods; 4) keep procurement and sales records for customs verification; 5) pay attention to prohibited and restricted sales lists to avoid violations.
Q: Are both safety valves and pressure-reducing valves classified under 848140? How are they distinguished?
A: Yes, safety valves and pressure-reducing valves share subheading 848140. The key to distinguishing them lies in function: a safety valve opens to release pressure when the system pressure exceeds the set value, protecting equipment; a pressure-reducing valve is used to reduce inlet pressure and stabilize it at the required outlet pressure. When declaring, fill in accurately according to the actual working principle and use to avoid confusion.
Q: How can I check the import tax rate for safety valves?
A: The import tax rate for safety valves depends on the country of origin, trade agreements and customs policies. You can use the official website of the General Administration of Customs of China, the International Trade Single Window, or professional tariff query platforms, enter HS code 848140 and the country of origin, and obtain the most-favored-nation rate, agreement rate or general rate. Note that tax rates may change, and the latest published rates should prevail.
Q: What certifications are required for exporting safety valves?
A: Exported safety valves usually need to comply with the safety certifications of the target market, such as the EU CE/PED Directive, US ASME/API standards, China's special equipment manufacturing license, etc. Specific certification depends on valve type, pressure rating and use. It is recommended to communicate with certification bodies in advance to ensure product compliance.
Q: What are common errors in the declaration elements for safety valves during customs declaration?
A: Common errors include: misdeclaring safety valves as pressure-reducing valves or ordinary valves; omitting the pressure setting value; material declaration not being specific; incomplete brand and model entries; use description being too broad. These errors may lead to customs document review failure, inspection delays, or even classification disputes.
Q: Are HS codes for safety valves consistent across countries?
A: The first six digits of the HS code, 848140, are basically consistent internationally, but countries may subdivide subsequent digits. For example, the US HTSUS is 8481.40.00, the EU TARIC is 8481.40.00, and China is 8481.40.00.00. When exporting, confirm the complete code of the destination country to comply with local declaration requirements.
Q: If a safety valve is part of a complete set of equipment, how should it be classified?
A: If the safety valve is imported together with the main machine and constitutes a complete set of equipment, it should be classified according to the complete machine, such as a safety valve for a boiler being classified under 8402 with the boiler. If imported separately or as a spare part, it is classified under 848140. Classification of complete sets of equipment should refer to General Interpretative Rule 2(a) and the notes to the Harmonized System.
Q: How can I check tariff quotas or anti-dumping duties for safety valves?
A: Safety valves generally do not have tariff quotas, but may involve anti-dumping duties. You can check through the website of the Trade Remedy and Investigation Bureau of the Ministry of Commerce of China, announcements of the General Administration of Customs, or professional trade compliance databases. If anti-dumping is involved, documents such as certificates of origin must be provided, and a deposit may be required.
Q: What should be noted when selling safety valves via cross-border e-commerce?
A: When selling safety valves via cross-border e-commerce, note: 1) confirm that the product complies with the destination country's safety standards; 2) accurately declare the HS code and value; 3) understand the difference between personal items and commercial goods; 4) keep procurement and sales records for customs verification; 5) pay attention to prohibited and restricted sales lists to avoid violations.
⚠️ Disclaimer: HS code classification, declaration elements, tariff rates and regulatory conditions on this page are for reference only and do not constitute legal advice on customs classification. Tariff rates and regulations are subject to change; the latest announcements from the General Administration of Customs and on-site determinations shall prevail. Please consult professional customs brokers or customs authorities before import/export.