Patent ID: 6659121
Filing Date: 2003-12-09
Classification: F16K,Y10T

Abstract:
A hydraulic control valve including a hydraulic control valve body having a spool sliding in a sleeve, and a solenoid having a plunger and an excitation coil for generating magnetic force to move the plunger, said solenoid being attached to the hydraulic control valve body to apply moving force to the spool by movement of the plunger,wherein a cover for a side of said solenoid at which said solenoid is attached to the hydraulic control valve body is provided with upper and lower through-holes communicating with a plunger compartment accommodating the plunger, wherein an uppermost part of the upper through-hole is above or level with an uppermost part of the plunger compartment, and a lowermost part of the lower through-hole is below or level with a lowermost part of the plunger compartment, and wherein said hydraulic control valve body has upper and lower vertical holes, said upper vertical hole being provided at a position above the upper through-hole provided in the cover of said solenoid in communication with said upper through-hole, said lower vertical hole being provided at a position below the lower through-hole provided in the cover of said solenoid in communication with said lower through-hole, and said upper vertical hole being in communication with a tank port so that air can be exhausted from the plunger compartment through said upper through-hole and vertical hole.