Patent ID: 7815165

Claim:
A valve device comprising: a fluid passage; an inlet port for introducing fluid into the fluid passage; an output port for discharging fluid from the fluid passage; a valve body disposed in the fluid passage for opening or closing a valve port disposed in the fluid passage between the inlet port and the outlet port; an enlarged chamber formed in the fluid passage between the inlet port and the outlet port, the enlarged chamber having a cross-section larger than that of the inlet port and the valve port; and a barrier pillar, disposed in the enlarged chamber, for suppressing transmission of pulsating waves generated in the valve device to the inlet port, the barrier pillar having a flow resistance that is lower in a normal flow direction of the fluid from the inlet port to the valve port than in a reverse flow direction from the valve port to the inlet port, wherein the barrier pillar includes a hole or a slit through which the fluid is able to flow.