Patent ID: 6877961

Claim:
A pump apparatus comprising: a housing; a cover opposite to said housing; a flow control valve mounted in said housing, said flow control valve discharging constant volume of operation fluid to a fluid apparatus by returning a part of discharged fluid from said pump apparatus as excess fluid to a suction portion of said pump apparatus, and said flow control valve having a bypass hole to discharge said excess fluid in a direction which is oblique to the length of the bypass hole such that the discharged fluid is discharged to an incident side of the bypass passage; a bypass path formed in said housing to connect said bypass hole to said suction portion in order to send said excess fluid; and a pair of suction paths formed in at least one of said cover and said housing, said pair of suction paths being connected to an end portion of said bypass path via a pair of opening portions, said suction paths communicating to said suction portion of said pump apparatus, wherein said cover has a dividing wall opposite to said bypass path to distribute said operation fluid to said pair of suction paths; and a cross sectional area of one of said opening portions which is on the incident side of the bypass path is smaller than a cross sectional area of the other of said opening portions which is opposite to the incident side of the bypass path to restrict a flow of said operation fluid in said one of said opening portions relative to the other of said opening portions.