Modular container for a fluid made from a metal powder, wherein the container comprises a valve for metering a vertically or nearly vertically running fluid flow from a first container module of the modular container into a second container module, wherein the valve comprises a valve housing comprising a fluid inlet opening and a fluid outlet opening, wherein the valve housing comprises a housing channel in or on which a moveable valve body is arranged so that the housing channel is permeable to the fluid in an open valve-body position and impermeable to the fluid in the closed valve-body position, a seal assembly is provided by which the housing channel is tightly sealed in the closed valve-body position, the housing channel comprises a flow area through which the fluid flows when the valve-body position is open, the seal assembly is arranged outside the flow section, and wherein the modular container is designed in such a way that the valve-body movement occurs at a rapid pace when the valve-body position is changed, characterized in that the valve body is arranged in a moveable manner in a valve-body guide, wherein the valve-body guide is arranged above the valve body, and wherein the area of the projection of the valve-body guide to the plane of the fluid outlet opening is smaller than the area of the projection of the valve body to the plane of the fluid outlet opening so that the weight of the fluid column is essentially on the valve housing and the valve-body guide, whereby this relieves the valve body, that, in use, the rate of the valve-body position is faster than an inertial change in the direction and/or velocity of the fluid flow caused by the valve body and/or the valve housing, and that the fluid outlet side of the cross-section of the flow section comprises a smaller area than the cross-section of the seal assembly, wherein the flow region comprises at least one tapering, wherein the smaller cross-section of the flow section of the tapering is located in the area of the fluid outlet opening. the valve housing comprises a housing channel in or on which a moveable valve body is arranged so that the housing channel is permeable to the fluid in an open valve-body position and impermeable to the fluid in the closed valve-body position, a seal assembly is provided by which the housing channel is tightly sealed in the closed valve-body position, the housing channel comprises a flow area through which the fluid flows when the valve-body position is open, the seal assembly is arranged outside the flow section, and wherein the modular container is designed in such a way that the valve-body movement occurs at a rapid pace when the valve-body position is changed, characterized in that the valve body is arranged in a moveable manner in a valve-body guide, wherein the valve-body guide is arranged above the valve body, and wherein the area of the projection of the valve-body guide to the plane of the fluid outlet opening is smaller than the area of the projection of the valve body to the plane of the fluid outlet opening so that the weight of the fluid column is essentially on the valve housing and the valve-body guide, whereby this relieves the valve body, that, in use, the rate of the valve-body position is faster than an inertial change in the direction and/or velocity of the fluid flow caused by the valve body and/or the valve housing, and that the fluid outlet side of the cross-section of the flow section comprises a smaller area than the cross-section of the seal assembly, wherein the flow region comprises at least one tapering, wherein the smaller cross-section of the flow section of the tapering is located in the area of the fluid outlet opening.