Valve device having barrier for suppressing transmission of pulsating waves

Abstract

A present invention is advantageously applied to a purge valve for purging evaporated fuel stored in a canister to an intake pipe of an engine. The purge valve has a fluid passage connecting an inlet port and an outlet port, and a normally closed valve port that is selectively opened by operation of an electromagnetic actuator is disposed in the fluid passage. A barrier pillar is disposed in the fluid passage between the inlet port and the valve port to suppress transmission of pulsating waves generated in the purge valve to the canister. Flow resistance of the barrier pillar is higher in a reverse flow direction from the valve port to the inlet port than in a normal flow direction from the inlet port to the valve port. The transmission of the pulsating waves is well suppressed by the barrier pillar while allowing a smooth flow from the canister into the purge valve.

Dependencies are inferred from the claim text.