Patent ID: 6079694
Filing Date: 2000-06-27
Classification: F15B,F16K,Y10T

Abstract:
A fluid pressure device, comprising a housing formed with a cylindrical hole, and a shaft member having a cylindrical spool portion inserted in said cylindrical hole, said cylindrical spool portion being movable in said cylindrical hole in its axial direction, pressure of a pressurized fluid acting on a first side portion of said cylindrical spool portion being higher than that of a pressurized fluid acting on a second side portion of said spool portion separated from said first side portion in its axial direction, and a gap seal being provided between said first side portion and said second side portion, whereinsaid gap seal is provided with a plurality of seal portions by forming one or more fluid grooves for substantially equalizing a distribution of fluid pressure in a circumferential direction in said cylindrical spool portion, andin at least one of said plurality of seal portions, a first gap between an outer peripheral surface of said first portion side and an inner peripheral surface of said cylindrical hole is set slightly greater than a second gap between an outer peripheral surface of said second portion side and said inner peripheral surface of said cylindrical hole.