| 主权项 |
1. A gate valve assembly for use in a subsea workover system, the gate valve assembly comprising:
a valve block defining a valve cavity and passage; a cutting gate disposed in the valve cavity, the cutting gate having a through hole, the cutting gate configured to engage in a reciprocating motion in the valve cavity between an “open” position in which the through hole is aligned with the passage and a “closed” position in which the through hole is not aligned with passage, the cutting gate comprising two cutting edges extending along a portion of the through hole, the reciprocating motion of the cutting gate resulting in a double cutting operation of tubing conveyed strings passing through the gate valve assembly to produce a cutting of the tubing conveyed strings during each double cut of the tubing conveyed strings; two actuating means mounted to the valve block, engaging the cutting gate in the reciprocating motion and configured to work together in the cutting operation; and a slug pit formed in the valve block alongside the valve cavity defining a space arranged to collect one or more of the cuttings of the tubing conveyed strings resulting from the cutting operation, the slug pit being separate from the valve cavity and cutting gate, wherein the assembly is constructed such that the reciprocating motion of the cutting gate transports one or more cuttings of the tubing conveyed string to the slug pit and prevents the one or more cuttings from remaining in the through hole or falling into the valve cavity or passage to avoid jamming or obstructing the cutting gate during use. |
