초록 ▼

Valves having removable interior wear rings in which the wear ring comprises a high-hardness metal ring, the high hardness metal ring having an exterior surface configured to engage the body of gate valve. A polymeric overlay covers at least a portion of the exterior surface of the metal ring, the p

Valves having removable interior wear rings in which the wear ring comprises a high-hardness metal ring, the high hardness metal ring having an exterior surface configured to engage the body of gate valve. A polymeric overlay covers at least a portion of the exterior surface of the metal ring, the polymeric overlay forming the final dimensional shape of the wear ring.

대표청구항 ▼

1. A gate valve and a substantially circular wear ring for insertion into the gate valve comprising a gate valve having a body, a substantially circular wear ring comprising:a high-hardness metal ring, the high hardness metal ring having an exterior surface configured to engage the body of the gate

1. A gate valve and a substantially circular wear ring for insertion into the gate valve comprising a gate valve having a body, a substantially circular wear ring comprising:a high-hardness metal ring, the high hardness metal ring having an exterior surface configured to engage the body of the gate valve;a polymeric overlay covering at least a majority of the exterior surface of the metal ring, the polymeric overlay forming the final dimensional shape of the wear ring and configured to fit an interior surface of the body of the gate valve;wherein the metal ring has a first portion with a first circumference, and a second portion offset from the first portion so as to have a larger circumference, each of the first and second portions being overlain with the polymeric overlay; andwherein the offset between the first portion and second portion of the circular wear ring is at least partially exposed. 2. The substantially circular wear ring of claim 1, wherein high-hardness metal ring is a cast material and the exterior surface of the high-hardness metal ring is not substantially machined. 3. The substantially circular wear ring of claim 1, wherein the high-hardness metal ring is a cast material and circumferential exterior surfaces of the high-hardness metal ring are not substantially machined. 4. The substantially circular wear ring of claim 1, wherein the exterior surface configured to engage the body of the gate valve has two diameters. 5. The substantially circular wear ring of claim 4, wherein the two diameters are separated by a planar edge. 6. The substantially circular wear ring of claim 1, wherein the wear ring further comprises a front surface and a back surface, the front and back surfaces being substantially planar. 7. The substantially circular wear ring of claim 1, wherein the wear ring further comprises a front surface and a back surface, the front and back surfaces being substantially planar, the front and back surfaces having a machined surface finish. 8. The substantially circular wear ring of claim 1, wherein the inner surface of the high hardness metal ring comprises a substantially non-machined surface. 9. The substantially circular wear ring of claim 1, wherein the first portion of the offset between the first portion and second portion of the circular wear ring is at least partially covered by the polymeric material. 10. The substantially circular wear ring of claim 1, wherein the polymeric material is formed by casting. 11. The substantially circular wear ring of claim 1, wherein the polymeric material is from 2 to 10 mm thick. 12. The substantially circular wear ring of claim 1, wherein the polymeric material is from 3 to 8 mm thick. 13. A gate valve and a substantially circular wear ring for insertion into the gate valve comprising a gate valve having a body, a substantially circular wear ring comprising:a metal ring configured for insertion into the gate valve, the metal ring having an exterior surface configured to engage the body of the gate valve and an interior surface;a polymeric overlay covering at least a majority of the exterior surface of the metal ring, the overlay forming the final dimensional shape of the wear ring and configured to fit an interior surface of the body of the gate valve;wherein the metal ring has a first portion with a first circumference, and a second portion offset from the first portion so as to have a larger circumference, each of the first and second portions being overlain with the polymeric overlay; andwherein the offset between the first portion and second portion of the circular wear ring is at least partially exposed. 14. The substantially circular wear ring of claim 13, wherein metal ring is a cast material and the exterior surface of the high-hardness metal ring is not substantially machined. 15. The substantially circular wear ring of claim 13, wherein high-hardness metal ring is a cast material and circumferential exterior surfaces of the high-hardness metal ring are not substantially machined. 16. The substantially circular wear ring of claim 13, wherein the wear ring further comprises a front surface and a back surface, the front and back surfaces being substantially planar, the front and back surfaces having a machined surface finish. 17. A gate valve, the gate valve comprising: a valve body comprising a first opening, a second opening and an interior, wherein a gate is configured to move into and out of the interior of the valve body so as to substantially prevent a flow of liquids through the valve body when the gate is inserted into the interior of the valve body;first and second metal wear rings inserted within the valve body, the wear metal rings positioned on either side of the path of the gate so as to partially line the interior of the valve body, the wear rings comprising a polymeric overlay covering at least a majority of the exterior surface of the metal ring, the polymeric overlay forming the final dimensional shape of the wear rings;wherein the metal ring has a first portion with a first circumference, and a second portion offset from the first portion so as to have a larger circumference, each of the first and second portions being overlain with the polymeric overlay; andwherein the offset between the first portion and second portion of the circular wear ring is at least partially exposed.