Patent ID: 8789512

Claim:
A fluid pressure regulating device is able to regulate the pressure of a fluid introduced into a fluid introduction side fluid passage to a set pressure that has been set beforehand, the fluid pressure regulating device comprising: a housing that includes the fluid introduction side fluid passage into which fluid is introduced and a fluid discharge side fluid passage from which the fluid is discharged, a partition wall-shaped pressure regulating member that forms a pressure regulating chamber inside the housing, the pressure regulating chamber being communicated with the fluid introduction side fluid passage, and that communicates the fluid introduction side fluid passage with the fluid discharge side fluid passage according to a pressure of the fluid introduced into the pressure regulating chamber, and a first valve seat portion and a second valve seat portion that are provided in the housing, the first valve seat portion and the second valve seat portion separating the fluid introduction side fluid passage from the fluid discharge side fluid passage in the pressure regulating chamber, and forming another fluid passage inside the pressure regulating chamber, the other fluid passage being switched between being communicated with the fluid introduction side fluid passage and being communicated with the fluid discharge side fluid passage, by the pressure regulating member, wherein a clearance between the pressure regulating member and the first valve seat portion is set different from a clearance between the pressure regulating member and the second valve seat portion, such that when the pressure regulating member abuts against one valve seat portion, from among the first valve seat portion and the second valve seat portion, a small gap is formed between the other valve seat portion, from among the first valve seat portion and the second valve seat portion, and the pressure regulating member.