| http://www.w3.org/ns/prov#value | - In a gate valve with a pair of spaced-apart body halves having positioned therebetween a slot that extends transverse to a fluid passageway, an O-port gate having a gate thickness and a fluid impermeable portion and an adjacent fluid aperture, the gate being moveable within the slot and including a pair of opposed major surfaces, the improvement comprising:a pair of opposed, generally rigid plasti
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