Valve stem seals are critical components used in internal combustion engines to control the flow of oil to the valve stems. Typically made from high-quality elastomers or polymer materials and are designed to prevent oil leakage into the combustion chamber, which can lead to undesirable emissions and engine performance issues.

In an engine, the valve stem seals fit snugly around the valve stems, allowing the engine to maintain the proper level of oil while preventing excess oil from entering the combustion chamber. This ensures that the engine runs efficiently, minimizing the risk of engine knock, excessive carbon buildup, or burning oil.

The key features of valve stem oil seals include their ability to withstand high temperatures, resist wear, and endure exposure to harsh chemicals and engine fluids. Valve stem seals are available in various designs, including umbrella, lip, and O-ring types, each suitable for different engine types and performance requirements.

NQKSF offers an extensive range of standard and custom valve stem seals. Please refer to our sizing charts for dimensions.