Patent ID: 6994102

Claim:
A pressure regulating valve for regulating a pressure of fluid to be outputted from the pressure regulating valve, the pressure regulating valve comprising: a valve body having a cylinder, a supply passage which fluidly communicates the cylinder and a fluid pressure supply source, and a drain passage which fluidly communicates the cylinder and a sump; a spool slidably disposed in the cylinder with a clearance, the spool being made of a material having a lower thermal expansion coefficient than that of a material of the valve body, the spool and the cylinder defining a pressure chamber and a space portion; an urging member disposed in the space portion to urge the spool in a direction opposite to a direction of a force applied to the spool by fluid pressure in the pressure chamber; a through-passage formed in the spool so as to fluidly communicate the pressure chamber and the space portion; and an orifice disposed between the space portion and a sump to limit a flow rate of fluid drained from the space portion to the sump.