Patent ID: 6454272
Filing Date: 2002-09-24
Classification: F16J

Abstract:
A sealing arrangement for sealing a space, which extends between high and low pressure areas and which is defined between a first apparatus part and a cylindrical surface of a second apparatus part, the first and second apparatus parts being mutually moveable in a reciprocating manner along the axis of said cylindrical surface, said sealing arrangement comprising:an annular sealing member of resilient material having a radially outer peripheral surface extending between axially opposite first and second end surfaces facing said high and low pressure areas, respectively, and a radially inner peripheral surface for sealingly engaging with the cylindrical surface of the second apparatus part at a contact area and for defining with the cylindrical surface a first space widening or diverging from said contact area toward the low pressure area; and a compression ring surrounding the annular sealing member, the compression ring being in contact with the outer peripheral surface of the annular sealing member so as to press the inner peripheral surface thereof into close contact with the cylindrical surface of the second apparatus part at said contact area; the axial sectional view of at least part of the outer peripheral surface of the annular sealing member coming into contact with the compression ring defining a convex contour that in an unstressed condition of the sealing member the radial distance between the convex contour of the outer peripheral surface and a radially innermost part of the inner peripheral surface is decreasing in an axial direction toward the second end surface and the low pressure area, the convex contour having a radius of curvature at least 0.4 times the total axial length of the annular sealing member.