In this paper, the sealing mechanism of
knife
-
edge
seals was explained and a new type of
knife
edge
was developed. The following results were obtained: (1) The sealing mechanism of
knife
-
edge
seals was divided into three types according to the width of the flat area on the apex of the
knife
edge
: (a) the penetration type, (b) the indentation type, and (c) the intermediate type. The P
c/l-values of the compressive force for sealing were the lowest in the case of type (a). (2) The developed
knife
edge
had a sealing mechanism of the penetration type (a). The P
c-values of contact pressure for sealing were nearly equal to the Meyer's hardness in the sealing surface layer, regardless of both the surface roughness and the sealing surface finish. In the cases where sealing materials of copper, carbon steel and stainless steel were utilized, the P
c/l-values were approximately 15-40, 45-110 and 80-190 kN/m, respectively.
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