Seal for use in sliding sleeves to control gas exchange in counter-piston engines, has valve seat surface divided into two patches, where one of patches performs force-effective opening of sleeve and other patch effectively closes sleeve

摘要

The seal has a valve seat surface divided into two patches with different functions. One of the patches performs force-effective opening of a sliding sleeve, and the other patch effectively closes the sliding sleeve while increasing overall carrying surface. The patches are separated from each other by using a relief groove. A sealing part penetrating gas is exhausted by using the patches in a pressure-less manner such that the patches exert no-force on a basic part of the valve seat surface. The gas is exhausted through the grooves.