Pneumatic material handling system

In a pneumatic material handling system which includes a conduit arrangement for conveying dry, solid particulate product to a selected one of plural destinations from a selected one of at least two separate upstanding dry, solid particulate product supply containers each having a product outlet opening located at a lower end thereof and delivering the dry, solid particulate product thereof to a gas and product opening for conveyance of gas and the product thereof to said selected one of said plural destinations, the system having first means defining a gas inlet opening and second means for joining the gas and the product from the selected one of the two separate product supply containers for delivery to a respective one of said gas and product openings, said gas inlet opening and the respective one of said gas and product openings being connected to said conduit arrangement so that a gas stream traveling at a sufficient velocity through said conduit arrangement will be sufficient to pick up and entrain the dry, solid particulate product in the gas stream, said conduit arrangement including a gas pumping means for pulling the gas stream into said gas inlet opening and through said conduit arrangement, said gas pumping means being connected to said conduit arrangement adjacent a gas outlet end thereof so as to create a less than atmospheric pressure inside said conduit arrangement and effecting a drawing of the gas into said conduit arrangement through said gas inlet opening, the improvement comprising at least first and second identically constructed valves connected into said conduit arrangement intermediate each said gas and product opening and said selected one of said plural destinations, each said first and second identically constructed valves comprising:

• a base plate having at least first and second separate through passageways extending therethrough,
• a movable plate slidably mounted on said base plate and movable between first and second positions relative to said base plate, said movable plate having a third through passageway extending therethrough and being axially aligned with said first through passageway in said first position of said movable plate and with said second through passageway in said second position of said movable plate,
• said base plate and said movable plate each having mutually opposed and slidably engaged flat surfaces,
• means for facilitating a sealingly drawing together of said mutually opposed and slidably engaged flat surfaces in response to said less than atmospheric pressure inside said conduit arrangements, and
• a drive means for moving said movable plate between said first and second positions;
• first connecting means for connecting each said gas and product opening to a respective one of said first through passageways on said first and second identically constructed valves;
• second connecting means for connecting said second through passageway on said first valve to said third through passageway on said second valve;
• and
• third connecting means for connecting said third through passageway on said first valve to said conduit arrangement leading to said selected one of said plural destinations;
• whereby a positioning of said movable plate of said first and second valves in a selected one of said first and second positions will effect a selecting of the dry, solid particulate product supply container from which dry, solid particulate product thereof is to be introduced to the respective one of said gas and product openings, be picked up and entrained in the gas stream thereat, and conveyed to said selected one of said plural destinations.