Patent ID: 7717400

Claim:
A fluid pressure regulating device for regulating pressure of fluid, including a fluid inlet, a fluid outlet, a fluid passage provided between the fluid inlet and the fluid outlet, a valve seat disposed in the fluid passage, a valve that can move along the fluid passage and includes a contact surface that contacts a wall surface defining the fluid passage, and a valve head that can contact the valve seat, and an elastic force generating member that generates an elastic force of moving the valve in a direction in which the valve head contacts the valve seat, the fluid passage including an inflow fluid passage disposed on the upstream side of the contact surface of the valve and an outflow fluid passage disposed on the downstream side of the contact surface of the valve, and a first communicating part that provides communication between the inflow fluid passage and the outflow fluid passage, wherein: the inflow fluid passage includes a first inflow fluid passage, a second inflow fluid passage disposed on the downstream side of the first inflow fluid passage, and a throttle section disposed between the first inflow fluid passage and the second inflow fluid passage, the valve has a hole having a bottom and open on the downstream side, the hole of the valve has a first hole and a second hole that is disposed on the downstream side of the first hole and has a larger section perpendicular to its axial direction than the first hole, and the valve is inserted through the throttle section with a clearance, and the first communicating part comprises at least one first communication hole that provides communication between the second inflow fluid passage and the second hole of the valve.