Abstract: A knife gate valve is constructed of two body members bolted together about a resilient gate seat. The two body members and the resilient gate seat include sets of axially aligned bolt holes through which machine bolts extend. Matching flanges on the body members form a recess for receiving the resilient gate seat, thereby constraining its movement and preventing its deformation when the knife gate is closed. The matching flanges also facilitate the uniform tightening of the machine bolts during gate valve assembly.

Abstract: A knife gate valve comprises a body member to which two aligned conduits are attached. The body member has a U-shaped internal recess of predetermined length formed within it. A removable sealing member fits within the recess and extends along its entire length. The sealing member is comprised of rubber which has been cured about a threaded or irregularly surfaced rod that reinforces the seat, helping to keep it in the correct position and orientation in the recess. The rod protrudes from both lengthwise ends of the rubber and is operatively connected with the body of the valve. This prevents the sealing member from being dislodged by the flow of slurry through the valve or the opening action of the valve in the presence of a sticky slurry.