Abstract: A transfer valve for permitting fluent particulate materials to flow from a closed transport container, having a bottom wall with an outlet aperture, into a closed base container having a top wall with a sealed inlet aperture adapted for sealed engagement with the bottom wall of the transport container; the transfer valve permitting operation without exposure of an operator to contact with the fluent particulate materials, comprises a transfer valve member having provisions for occluding the outlet aperture of the transport container; a further provision for latching and disabling the transfer valve member in a closed position; and another provision on the sealed base container, for enabling the disabled transfer valve member when the base container is in sealed engagement with the transport container. The base container is also equipped for dispensing particulate material from the base container at a controlled rate.