FIELD: valves and piston pumps. SUBSTANCE: thin-walled casing made of antifriction material is placed between surface of one member of pair and proper surfaces of bushing and washers. Length of casing equals sum of lengths of bushing and washers. Bushing is located between washers. Anti-extrusion rings have triangular section and are placed on faces of washers along sealing periphery. Cylindrical surface of bushing has annular grooves which summary volume close to surface of bushing touching casing is less than volume of grooves near its opposite surface. Rings located on side of members of axial compression of seal are interjoined with mounting connectors. EFFECT: enhanced reliability of seal. 1 cl, 1 dwg
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