Lined disc valve and mold for forming the lining

Claim 2

A disc valve for controlling the flow of fluid through adjacent sections of conduit having threaded end, comprising: a body of relatively rigid material having a bore extending longitudinally therethrough and threads formed in the opposite ends of the bore for receiving the threaded ends of the adjacent sections of conduit, said body also having a pair of diametrically aligned valve stem journals in the wall thereof between said threads; a stem extending at least partially through said journals; a disc carried by the stem within said bore; means secured to the stem externally of the body for turning the stem and disc; and an elastomer molded-in place and bonded around the entire inner periphery of the body between the threads and including portions of said threads engaged by the threaded ends of the adjacent sections of conduit, shielding the body from contact with the fluid being controlled, a portion of said elastomer being shaped to be sealingly engaged by the entire outer periphery of the disc when the disc is positioned in a plane transverse to the axis of said bore to prevent the flow of fluid through the valve.

Claim 3

A valve as defined in claim 1 wherein the elastomer surrounds and sealingly engages the stem adjacent each of said journals to prevent the leakage of fluid between the stem and either of said journals.

Claim 4

A valve as defined in claim 2 wherein a bead is formed on the elastomer around the stem adjacent each of said journals.

Claim 5

A valve as defined in claim 1 wherein the disc is offset from the axis of the stem.

Claim 6

A valve as defined in claim 4 wherein the disc comprises a stamped plate, and characterized further to include screws securing the disc to the stem.

Claim 7

A valve as defined in claim 4 wherein the elastomer is shaped to form a boss around at least a portion of the stem adjacent each of the journals, each of said bosses being exposed to the pressure of the fluid being controlled by the valve.

Claim 8

A valve as defined in claim 1 characterized further to include an O-ring in a mating groove in each journal surrounding and sealingly engaging the adjacent portion of the stem.

Claim 9

A mold for forming an elastomer lining in a tubular valve body having internal threads in the opposite ends thereof and a pair of diametrically opposed valve stem journals in the wall of the body between the threads, comprising: a ring having an outer diameter less than the inner diameter of the body; a length less than the distance between said threads, and a pair of diametrically opposed apertures in the medial portion thereof; a pair of pins, each of which extends through one of the journals and one of said apertures for supporting the ring in the body; a first substantially cylindrical member in one end of the body engaging the adjacent end of the ring, the inner end portion of said member from the adjacent end of the ring to a medial portion of the threads in the body at the respective end of the body having an outer diameter less than the inner diameter of the surrounding portions of the body and body threads, and said member having external threads thereon adjacent said inner end portion threadedly engaging a portion of the threads in the respective end of the body; a second substantially cylindrical member in the opposite end of the body having its inner end adjacent the ring, the inner end portion of said second member from the inner end thereof to a medial portion of the threads in the body at the respective end of the body having an outer diameter less than the surrounding portions of the body and body threads, said second member having external threads thereon adjacent the inner end portion thereof threadedly engaging a portion of the threads in the respective end of the body, said second member also having a bore extending longitudinally therethrough; and a piston reciprocally disposed in the bore of said second member adapted to move inwardly with respect to the valve body into engagement with the respective end of the ring for forcing uncured elastomer into the annular space surrounding the ring and the inner end portions of said first and second members for subsequent curing into said lining.

Claim 10

A mold for forming an elastomer lining in a tubular valve body having internal threads in the opposite ends thereof and a pair of diametrically opposed valve stem journals in the wall of the body between the threads, comprising: a ring having an outer diameter less than the inner diameter of the body; a length less than the distance between said threads, and a pair of diametrically opposed apertures in the medial portion thereof; a pair of pins, each of which extends through one of the journals and one of said apertures for supporting the ring in the body; a first substantially cylindrical member in one end of the body engaging the adjacent end of the ring, the inner end portion of said member from the adjacent end of the ring to a medial portion of the threads in the body at the respective end of the body having an outer diameter less than the inner diameter of the surrounding portions of the body and body threads, and said member having external threads thereon adjacent said inner end portion threadedly engaging a portion of the threads in the respective end of the body; a second substantially cylindrical member in the opposite end of the body having its inner end adjacent the ring, the inner end portion of said second member from the inner end thereof to a medial portion of the threads in the body at the respective end of the body having an outer diameter less than the surrounding portions of the body and body threads, said second member having external threads thereon adjacent the inner end portion thereof threadedly engaging a portion of the threads in the respective end of the body, said second member also having a bore extending longitudinally therethrough; and a piston reciprocally disposed in the bore of said second member adapted to move inwardly with respect to the valve body into engagement with the respective end of the ring for forcing uncured elastomer into the annular space surrounding the ring and the inner end portions of said first and second members for subsequent curing into said lining.

Claim 11

A mold as defined in claim 8 wherein each of said first and second members has an external shoulder thereon to engage the respective outer end of the valve body and limit the inward movement of the respective member into the body.

Claim 12

A mold as defined in claim 8 wherein said first member has a substantially cylindrical extension on the inner end thereof engaging the inner periphery of the ring and holding the ring concentrically in the valve body.

Claim 13

A mold as defined in claim 8 wherein said first member has a longitudinal bore extending partially therethrough from the outer end thereof, and wherein the ring and said first member have mating restricted apertures therein providing communication from the outer periphery of the ring to said bore in said first member for bleeding off air displaced by the elastomer being injected into the body and for disposing of excess uncured elastomer injected into the valve body.

Claim 14

A mold as defined in claim 8 wherein each of said pins has an annular groove in the outer periphery thereof adjacent the outer periphery of the ring to form a sealing bead in the lining around each of said pins.