Abstract: A discharge valve plate of the type used in the conduit between an exhauster fan and a riffle box in a coal fine delivery system for a coal-fired combustion chamber in a power plant. The axis of rotation of the discharge valve plate is oriented generally perpendicular to the axis of rotation of the exhauster fan, such that the valve plate bisects the flow of coal fines from the exhauster fan into upper and lower flows, each having heavy and light distributions across the width of the conduit. The discharge valve plate is provided with diffuser elements engaging the upper and lower flows to cause the heavy and light flow distributions to mix prior to reaching the riffle box.

Abstract: A stencil for contact printing paste solder onto lead and component pads of the leaded substrate of a SIP is a plate having holes therethrough in the pattern of the pads, a first recess in the solder side of the plate over the area of the plate having component holes, and a second recess in the substrate side of the plate adjacent lead holes that are connected to the second recess by narrow slots dimensioned to receive portions of associated leads. The second recess and lead holes are dimensioned for receiving the lead frame and tines on lead pads. In a printing application, the padded side of the substrate contacts the substrate side of the plate with lead tines on lead pads located in associated lead holes, the thickness of the plate adjacent lead holes being slightly greater than the height that lead tines project above the substrate. The depth of the first recess is selected to make paste solder in component holes adhere to associated component pads when the plate and substrate are separated.