Connector

A connector being in a fuel supply system that pressurizes low-pressure fuel supplied from a low-pressure pump by a high-pressure pump and supplies high-pressure fuel to an internal combustion engine, and connected to a low-pressure pipe through which the low-pressure fuel flows, the connector comprising:

• a connector body formed in a cylindrical shape, and having an annular valve seat on an inner circumferential surface;
• and
• a valve housed inside the connector body, and disposed reciprocally movable in a flow path direction of the connector body,
• wherein the valve comprises:
• a valve seat contact surface formed on an outer circumferential surface, axially separating from the annular valve seat of the connector body and forming a forward-direction flow path with the annular valve seat of the connector body due to pressure of the low-pressure fuel when the high-pressure fuel does not flow in reverse, and being capable of coming into contact with the annular valve seat of the connector body when the high-pressure fuel flows in reverse;
• and
• a tapering through hole formed farther radially inward than the valve seat contact surface, forming an orifice flow path having a smaller flow path cross-sectional area than the forward-direction flow path, and allowing a reverse flow of the high-pressure fuel when the high-pressure fuel flows in reverse.