Valve Seat Rings: An Integral Component

Valve seats are an important part of the configuration of both intake and exhaust valves. Other components include the valve itself, the valve guide, a spring seat, valve spring and spring retainer. When all of these components are working together appropriately, the combustion chamber can retain the quality of air tightness that is essential for operation. In addition to the valve seat, the cylinder liner, cylinder block, and valve seat rings must be in good working condition to ensure that air does not escape inappropriately.


Functions of Valve Seat Rings

The valve seats are important for at least the following four important functions.

  1. Compression gas sealing. The purpose of this is to prevent compressed gasses or combustion gasses from escaping into the manifold.
  2. Heat transfer. This involves allowing a certain amount of heat to move through the valve into the cylinder head.
  3. Maintaining the strength of the seal when the valve has been mounted. This is one area where the quality and integrity of the valve seat rings is crucial.
  4. Reduce wear-resistance. The entire valve seat must be able to withstand the pressure of high heat and high loads.


In addition to these functions, there are some characteristics that valve seats must display. These begin with smooth operation between the seat and the partner valve. Next is the ability to keep work processes low in order to keep operation within a reasonable cost. Finally, the seats and rings must be easy enough to machine in order to prepare them for specific applications.


Importance of Valve Seat Rings

Although valves may come in a variety of shapes and sizes, nearly all require valve seat rings. The rings provide a stable surface for shut off purposes. The rings are held into position by the pressure where the bonnet is fastened to the body of the valve. Some rings are threaded, but this is not appropriate for all applications. They are often beveled to provide for assistance in guiding the valve during the closing process. Without the seat rings, it would be difficult to obtain the necessary leak-proof seal.


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