Ink replenishment container

An ink replenishment container that replenishes an ink tank of a printer with ink via an ink introduction member communicating with the ink tank, the ink replenishment container comprising:

• a container main body configured to accommodate the ink;
• an ink outlet forming portion connected to the container main body and including a tubular portion forming an outlet on an opposite side from the container main body;
• and
• an outlet valve unit mounted in the ink outlet forming portion and configured to be opened by the ink introduction member inserted into the tubular portion from the outlet and to be closed by removal of the ink introduction member from the tubular portion;
• wherein
• the outlet valve unit includes
• a valve body disposed to be movable in a central axis direction along a central axis of the tubular portion,
• a spring member configured to bias the valve body in a first direction toward the outlet side in the central axis direction, and
• a seal member located on the outlet side from the valve body in the central axis direction, the seal member having a through-hole through which the ink introduction member is inserted and removed,
• in a valve-opened state, a gap through which the ink and the air communicate being formed between the seal member and the valve body that is pressed by the ink introduction member, which is inserted through the through-hole, in a second direction opposite to the first direction,
• in a valve-closed state, the valve body being in contact with the sealing member and the through-hole being closed by removal of the ink introduction member through the through-hole,
• wherein
• the seal member includes a first seal portion on an inner peripheral surface forming the through-hole, the first seal portion being at least partially in contact with a side surface of the ink introduction member inserted into the through-hole in the valve-opened state to seal the side surface of the ink introduction member,
• the first seal portion is an annular protruding portion having a minimum inner diameter portion in a first radial direction toward the central axis, in a radial direction orthogonal to the central axis direction,
• the protruding portion has a height from a second direction-side inner peripheral surface of the inner peripheral surface to the minimum inner diameter portion in the first radial direction, the second direction-side inner peripheral surface located on the second direction side from the protruding portion, and
• the seal member is formed such that in the protruding portion a volume of a valve body-side portion is smaller than a volume of an outlet-side portion, the valve body-side portion being a portion located on the second direction side with respect to a boundary, the outlet-side portion being a portion located on the first direction side with respect to the boundary, the boundary being a position of an end portion of the minimum inner diameter portion in the second direction.