Found 9 matching results
(CN → US)
| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 8484100000 | Doc | 57.5% | CN | US | 2025-05-12 |
| 8484900000 | Doc | 57.5% | CN | US | 2025-05-12 |
| 7326908688 | Doc | 82.9% | CN | US | 2025-05-12 |
| 7323997000 | Doc | 60.3% | CN | US | 2025-05-12 |
| 7323999080 | Doc | 83.4% | CN | US | 2025-05-12 |
| 4016993510 | Doc | 55.0% | CN | US | 2025-05-12 |
| 4016996010 | Doc | 57.5% | CN | US | 2025-05-12 |
| 4014905000 | Doc | 34.2% | CN | US | 2025-05-12 |
| 4014901000 | Doc | 30.0% | CN | US | 2025-05-12 |
Valve Cover Cushion
A valve cover cushion, also known as a valve cover gasket seal or valve cover set, is a component used in internal combustion engines to create a hermetic seal between the valve cover and the cylinder head.
Material
Valve cover cushions are typically constructed from one or a combination of the following materials:
- Rubber: Commonly used for its flexibility and sealing properties. Often a blend of various synthetic rubbers like nitrile, silicone, or fluoroelastomer for improved resistance to oil, heat, and chemicals.
- Cork: Traditional material, offering good compressibility and sealing, but less resistant to modern oils and temperatures.
- Fiber: Often a composite material including fiber reinforcement for durability and resistance to compression set.
- Silicone: Provides excellent heat resistance, flexibility, and sealing capabilities, commonly used in high-performance applications.
- Multi-Layer Steel (MLS): Used in high-performance engines for superior sealing and durability, often with a coating to prevent corrosion.
Purpose
The primary purpose of a valve cover cushion is to:
- Prevent Oil Leaks: Seal the valve cover to the cylinder head, preventing the leakage of engine oil.
- Maintain Engine Pressure: Contribute to maintaining proper crankcase pressure.
- Prevent Contamination: Prevent the ingress of dirt, debris, and moisture into the engine's valve train.
Function
The cushion functions by:
- Conforming to Surfaces: The material compresses and conforms to the irregularities of the valve cover and cylinder head mating surfaces.
- Resisting Compression Set: Maintaining sealing force over time despite thermal cycling and engine vibrations.
- Withstanding Oil Exposure: Resisting degradation from prolonged exposure to engine oil.
Usage Scenarios
Valve cover cushions are used in:
- Engine Assembly: Installed during the initial assembly of an engine.
- Engine Repair/Maintenance: Replaced during valve cover replacement or when oil leaks are detected.
- Engine Rebuilds: Always replaced during a complete engine rebuild to ensure a proper seal.
- Performance Upgrades: High-performance cushions are used in modified engines to provide enhanced sealing in demanding conditions.
Common Types
- Flat Gaskets: Simple, single-layer gaskets commonly used in older or less demanding applications.
- Shaped Gaskets: Contoured gaskets designed to fit specific valve cover and cylinder head configurations.
- Full Perimeter Gaskets: Provide a complete seal around the valve cover.
- Half-Moon Seals: Small, crescent-shaped seals used around valve cover breathers or oil filler caps.
- MLS Gaskets: Multi-layer steel gaskets used in high-performance engines for superior sealing.
- Gasket Sets: Include all necessary gaskets and seals for a complete valve cover replacement, often including breather seals and oil filler cap seals.
Valve cover cushions fall under articles of vulcanized rubber other than hard rubber. Here are the relevant HS codes based on the provided reference material:
- 4016993510: Other articles of vulcanized rubber other than hard rubber; Other; Other; Of natural rubber; Vibration control goods of a kind used in the vehicles of headings 8701 through 8705. This code specifically covers vibration control goods used in vehicles, which could include valve cover cushions designed to reduce vibration.
- 4016996010: Other articles of vulcanized rubber other than hard rubber; Other; Other; Other; Mechanical articles for motor vehicles. This code covers other mechanical articles for motor vehicles, and valve cover cushions, functioning as a mechanical component, may fall under this classification.
Regarding HS code 4016993510 and 4016996010, a 25.0%加征关税 applies, increasing to 30.0% after 2025.4.2. The total tax rate for both codes is 55.0% and 57.5% respectively.