Patent ID: 6502826
Filing Date: 2003-01-07
Classification: F16J

Abstract:
A piston seal for a high pressure hydraulic cylinder having a piston reciprocatably mounted within a cylinder bore of said hydraulic cylinder, said piston having a seal groove formed therein with a bottom side surface, said piston seal comprising:a rigid seal ring adapted for receipt within said seal groove and having an innermost surface spaced from said bottom side surface of said groove so as to define an annular cavity therebetween; an elastomeric energizer ring adapted for receipt within said annular cavity under said seal ring and being of a volumetric size smaller than said cavity so as not to define at least one void in said cavity wherein said energizer ring has an exposed surface portion that is not in contact with said groove or said seal ring; and a rigid mask structure disposed in said void, having a surface disposed in abutting contact with and masking a majority of said exposed surface portion of said energizer ring and having a radially outermost surface in abutting contact with only the innermost surface of the rigid seal ring.