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Designed to control how much oil lubricates the valve stem, valve stem seals play an important role in engine lubrication. These seals allow a controlled amount of oil to lubricate the valve stem as it moves in the valve guide.
Valve stem seals allow a controlled amount of oil to lubricate the valve stem as it moves in the valve guide. The amount of oil that passes by the valve stem seal must be precisely controlled. Too little oil causes stem and guide wear; too much oil causes carbon buildup leading to valve seat damage, decrease in volumetric efficiency, increased ...
We can offer a range of standard valve stem seals, which provide the correct oil metering rate for many applications. This is true for diesel and gasoline applications as well as for intake and exhaust valves. There are however, applications where the oil metering rate must be. adjusted.
A valve stem seal is very small relative to other gaskets and seals required in an engine, however the function of this seal is vital for proper valve train lubrication. What is it about the valve stem seal that makes it different than almost every other type of seal in an engine?
Two types of valve stems are rising stems and nonrising stems. Illustrated in Figures 2 and 3, these two types of stems are easily distinguished by observation. For a rising stem valve, the stem will rise above the actuator as the valve is opened.
The introduction of standards, such as EN ISO 10297, Gas cylinders -- Cylinder valves -- Specification and type testing, has made significant improvements to mitigate the risk of in-service issues. Historically, some basic design defects have occurred amongst valves from various manufacturers.
VALVE TRIM. The internal elements of a valve are collectively referred to as a valve's trim. The trim typically includes a disk, seat, stem and sleeves needed to guide the stem. A valve's performance is determined by the disk and seat interface and the relation of the disk position to the seat.
