Patent ID: 7174914

Claim:
A female coupler provided at an injection port in a liquid tank and which is normally closed and is opened when a liquid is supplied to the liquid tank, the female coupler comprising: a valve support accommodated in a hole portion of the injection port and comprising a projecting portion having a axial hole formed along an axis of the injection port; a cylindrical coupler main body placed around a periphery of the projecting portion of the valve support and comprising a locking projecting portion on an inner peripheral surface, a part of the coupler main body being embedded in the injection port so as to have its position fixed; a base valve accommodated in the coupler main body and having an fitting insertion portion inserted into the axial hole in the valve support and a valve seat portion placed on the projecting portion of the valve support, the fitting insertion portion and the valve seat portion being connected together; a bar-like portion projected from the valve seat portion of the base valve and having a plurality of valve grooves formed on a peripheral surface along an axial direction; and an elastically deformable packing member placed on the valve seat portion of the base valve and accommodating the bar-like portion, the packing member being partly fixedly retained in the coupler main body, wherein in a normal state, the packing member is partly sandwiched between the valve seat portion of the base valve and the locking projecting portion of the coupler main body to retain a sealed state, and the bar-like portion of the base valve is pressed to elastically deform the projecting portion of the valve support via the valve seat portion to form a gap between the valve seat portion and an end surface of the packing member, and a liquid flows from the valve grooves through the gap between the valve seat portion and the packing member and is then filled into an interior of the liquid tank.