Abstract: Flexible, plastic, solids-containing liners or panels are disposed in the chamber of the valve body for contacting, interfacing engagement with the gate. Accordingly, the panels and gate substantially fully occupy the chamber, and prevent an entry of slurry solids thereinto. The panels are rubber-backed to insure that the panels are pressed, sealingly, against the flat faces of the gate, and are arranged in parallel with the chamber walls.

Abstract: A walled body, has apertures formed in front and rear walls thereof in which resilient seats are set. The latter sealingly engage a plate-type gate, centrally apertured for alignment with the seats, to define a portway through which to convey pipeline media. The gate is movable through the body to open and close the portway, and the body has sealing at the top and bottom to define thereof a pressure-containing shell. Further, sides of the body have openings formed therein, sealed off by removable plates. Exposure of the side openings allow for the venting of any seat leakage to the atmosphere, and inhibit any chance of solids buildup around the seats. The body is boltable to an upstream pipe of a pipeline, or for interpositioning in a pipeline.

Abstract: 1.