| 摘要 |
An expanding disk gate valve assembly comprises two gate disks and an elastomeric disk. A first flange on a first gate disk mates to a second flange on a second gate disk forming an internal volume surrounding the elastomeric disk. An elastomeric sheath covers the mated disks with the first gate disk being radially offset from, and radially movable relative to, the second gate disk. A width of the gate disk assembly is less than a width between two valve seats when the gate disk assembly is in an open position. In a closed position, the first flange moves radially toward the second flange, compressing elastomeric disk, and causes the elastomeric disk to expand axially against the two gate disks, forcing them apart, and increasing the gate disk assembly width so that the gate disk assembly actively seals against the valve seats. |
| 主权项 |
1. A gate disk assembly for a gate valve having a gate chamber with an inlet valve seat and an outlet valve seat, the gate disk assembly comprising:
i) a first gate disk having a central axis, a face, a back surface, a perimeter, and a first flange extending axially from the back surface of the first gate disk along at least half of the perimeter of the first gate disk; ii) a second gate disk having a central axis, a face, a back surface, a perimeter, and a second flange extending axially from the back surface of the second gate disk along at least half of the perimeter of the second gate disk, the first flange and the second flange being sized and located such that when the first gate disk is assembled coaxially with the second gate disk, ends of the first flange and ends of the second flange overlap to define a hollow volume bounded by the back surface of the first gate disk, the back surface of the second gate disk, an inner surface of the first flange, and an inner surface of the second flange; iii) an elastomeric disk filling the hollow volume and holding the central axis of the first disk radially offset from the central axis of the second disk when the elastomeric disk is in an uncompressed state; iv) an operating stem coupling attached to the first flange for movement of the first flange; and v) an elastomeric sheath enclosing the first gate disk, the second gate disk and the elastomeric disk; such that operation of the operating stem moves the gate disk assembly against a side of the gate chamber, the elastomeric disk is compressed between the first flange and the second flange, causing a width of the gate disk assembly to increase to seal against the inlet valve seat and the outlet valve seat. |
