Abstract: An administration device for intravitreal administration of a fluid wherein a second actuation part of the administration device is configured to axially block a plunger rod and/or a first actuation part of the administration device, where in the second actuation part is to be actuated in order to axially release the plunger rod and/or the first actuation part such that the first actuation part can be actuated. The administration device has a securing member that is configured to block a back-movement of the plunger rod and/or the first actuation part at least in an initial position and/or in an administration position of the plunger rod and wherein the securing member is configured to block actuation of the second actuation part before reaching the administration position of the plunger rod.

Abstract: An overflow valve is built into a metering head for a metering pump used with aggressive media and under high pressure. The overflow valve follows the suction valve or expands it, and directly lowers a critical pressure that occurs in the metering head, using an overflow line. In this way, the safety of the arrangement is improved, and at the same time, less construction space is used up by the additional valve.

Abstract: An overflow valve is built into a metering head for a metering pump used with aggressive media and under high pressure. The overflow valve follows the suction valve or expands it, and directly lowers a critical pressure that occurs in the metering head, using an overflow line. In this way, the safety of the arrangement is improved, and at the same time, less construction space is used up by the additional valve.

Abstract: An overflow valve is built into a metering head for a metering pump used with aggressive media and under high pressure. The overflow valve follows the suction valve or expands it, and directly lowers a critical pressure that occurs in the metering head, using an overflow line. In this way, the safety of the arrangement is improved, and at the same time, less construction space is used up by the additional valve.

Abstract: An overflow valve is built into a metering head for a metering pump used with aggressive media and under high pressure. The overflow valve follows the suction valve or expands it, and directly lowers a critical pressure that occurs in the metering head, using an overflow line. In this way, the safety of the arrangement is improved, and at the same time, less construction space is used up by the additional valve.