Knife Gate Valve Liner

Abstract

Embodiments of the invention provide a knife gate valve including a valve body assembly defining a passageway having an axis and including a first body half and a second body half each including a flange recessed portion defining a flange recess surface. Each flange recess surface includes a first flange surface portion, a second flange surface portion, and a raised flange bead between the first flange surface portion and the second flange surface portion. The knife gate valve further includes a one-piece liner arranged between the first body half and the second body half, and including a first liner flange engaged with the first flange surface portion, the raised flange bead, and the second flange surface portion of the first body half, and a second liner flange engaged with the first flange surface portion, the raised flange bead, and the second flange surface portion of the second body half.

1 . A knife gate valve comprising:
 a valve body assembly defining a passageway having an axis and including a first body half and a second body half each including a flange recessed portion defining a flange recess surface, each flange recess surface including a first flange surface portion, a second flange surface portion, and a raised flange bead arranged between the first flange surface portion and the second flange surface portion; and   a one-piece liner arranged between the first body half and the second body half and including a first liner flange engaged with the first flange surface portion, the raised flange bead, and the second flange surface portion of the first body half, and a second liner flange engaged with the first flange surface portion, the raised flange bead, and the second flange surface portion of the second body half.   
     
     
         2 . The knife gate valve of  claim 1 , wherein the raised flange bead of the first body half is arranged radially around and protrudes from the flange recess surface of the first body half, and the raised flange bead of the second body half is arranged radially around and protrudes from the flange recess surface of the second body half. 
     
     
         3 . The knife gate valve of  claim 1 , wherein the first flange surface portion and the second flange surface portion of the first body half are coplanar, and the first flange surface portion and the second flange surface portion of the second body half are coplanar. 
     
     
         4 . The knife gate valve of  claim 1 , wherein the first flange surface portion and the second flange surface portion of the first body half are arranged substantially perpendicular to the axis, and the first flange surface portion and the second flange surface portion of the second body half are arranged substantially perpendicular to the axis. 
     
     
         5 . The knife gate valve of  claim 1 , wherein the one-piece liner includes an upwardly extending chest portion having a liner top flange. 
     
     
         6 . The knife gate valve of  claim 5 , further comprising a gland assembly including at least one packing layer enclosed by a gland box, the gland box sealing the liner top flange between the at least one packing layer and a male gland follower of the first body half and the second body half. 
     
     
         7 . The knife gate valve of  claim 1 , wherein the raised flange bead of the first body half defines a substantially rectangular shape in cross-section, and the raised flange bead of the second body half defines a substantially rectangular shape in cross-section. 
     
     
         8 . The knife gate valve of  claim 1 , wherein the raised flange bead of the first body half engages the first liner flange to provide a first line contact seal, and the raised flange bead of the second body half engages the second liner flange to provide a second line contact seal. 
     
     
         9 . The knife gate valve of  claim 1 , wherein the first liner flange compresses against the first flange surface portion, the raised flange bead, and the second flange surface portion of the first body half with a force substantially perpendicular to the flange recess surface, and the second liner flange compresses against the first flange surface portion, the raised flange bead, and the second flange surface portion of the second body half with a force substantially perpendicular to the flange recess surface. 
     
     
         10 . The knife gate valve of  claim 1 , wherein the first body half is configured to receive a first pipe flange and the raised flange bead of the first body half enables a first integral seal to be formed between the first pipe flange and the first body half, and the second body half is configured to receive a second pipe flange and the raised flange bead of the second body half enables a second integral seal to be formed between the second pipe flange and the second body half. 
     
     
         11 . A one-piece liner for a knife gate valve including a gate moveable between a first position and a second position, the one-piece liner comprising:
 a radial sealing bead configured to seal against the gate in the second position and defining a protrusion height, a top, a centerline, and a bottom, the protrusion height varying from a maximum height at the top to a minimum height at the bottom, the minimum height less than the maximum height.   
     
     
         12 . The one-piece liner for a knife gate valve of  claim 11 , further comprising a second radial sealing bead configured to seal against the gate in the second position and defining a protrusion height, a top, a centerline, and a bottom, the protrusion height varying from a maximum height at the top to a minimum height at the bottom, the minimum height less than the maximum height. 
     
     
         13 . The one-piece liner for a knife gate valve of  claim 12 , further comprising a first liner bore surface, a second liner bore surface, and a gate slot configured to slidably receive the gate and including a first longitudinal surface and a second longitudinal surface opposing the first longitudinal surface. 
     
     
         14 . The one-piece liner for a knife gate valve of  claim 13 , where the radial sealing bead is arranged adjacent to the first liner bore surface on the first longitudinal surface, and the second radial sealing bead is arranged adjacent to the second liner bore surface on the second longitudinal surface. 
     
     
         15 . The one-piece liner for a knife gate valve of  claim 11 , further comprising an upwardly extending chest portion having a liner flange. 
     
     
         16 . A knife gate valve comprising:
 a valve body assembly defining a passageway having an axis and including a flange recessed portion defining a flange recess surface including a first flange surface portion, a second flange surface portion, and a raised flange bead arranged between the first flange surface portion and the second flange surface portion; and   a one-piece liner arranged at least partially within the valve body and including a cylindrical portion, an upwardly extending chest portion, and a gate slot, the cylindrical portion including a liner bore surface and a liner flange engaged with the first flange surface portion, the raised flange bead, and the second flange surface portion, and   the gate slot including a radial sealing bead arranged adjacent to the liner bore surface on a longitudinal surface of the gate slot, the radial sealing bead defining a protrusion height, a top, a centerline, and a bottom, the protrusion height varying from a maximum height at the top to a minimum height at the bottom, the minimum height less than the maximum height.   
     
     
         17 . The knife gate valve of  claim 16 , further comprising a second radial sealing bead opposing the radial sealing bead. 
     
     
         18 . The knife gate valve of  claim 16 , wherein the raised flange bead is arranged radially around and protrudes from the flange recess surface. 
     
     
         19 . The knife gate valve of  claim 16 , wherein the valve body assembly is configured to receive a slip on pipe flange and the raised flange bead enables an integral seal to be formed between the slip on pipe flange and the valve body. 
     
     
         20 . The knife gate valve of  claim 16 , wherein the raised flange bead engages the liner flange to provide a line contact seal.