Patent ID: 7909060

Claim:
A pressure control valve comprising: a sleeve in which an input port, an output port, and a drain port are formed; and a linear solenoid portion which generates thrust; said sleeve includes, a first spool, which is disposed within said sleeve so as to advance and retreat, and which receives a transmission of said thrust, regulates an input pressure that is input to said input port and outputs an output pressure from the output port, and a second spool, which is disposed within said sleeve and said first spool so as to advance and retreat, and which receives a transmission of said thrust and applies said output pressure as a feedback pressure on the first spool; wherein said second spool includes a great-diameter land, which functions as a first supporting portion against said first spool; and a middle-diameter moving iron core contact portion, which functions as a second supporting portion against said first spool; wherein, on the outer circumferential face of the moving iron core contact portion, flat portions are formed in parallel on at least one place in the circumferential direction.