Patent ID: 6957656

Claim:
A proportional solenoid valve comprising: an input port to which a fluid is supplied; an output port that communicates with the input port; a drain port from which a part of the fluid supplied to the input port is discharged; a cylindrical valve seat member that includes an input/output-side passage provided between the input port and the drain port and between the output port and the drain port, a seat portion that is provided in an end portion of the input/output-side passage, and a drain-side passage provided between the seat portion and the drain port; a ball-shaped valve element that is brought into and out of contact with the seat portion; and a valve drive portion that includes a coil and displaces the valve element in accordance with a current applied to the coil, thereby changing an amount of the fluid flowing from the input/output-side passage to the drain port through the drain-side passage and changing an output pressure from the output port, wherein the drain-side passage is formed by exhaust passage holes whose number is an even number equal to four or more than four and which are arranged at regular intervals in a circumferential direction of the valve seat member, wherein a total sectional area of all of the exhaust passage holes is set as equal to a seat area of the seat portion.