| 摘要 |
<p>A GATE VALVE CAPABLE OF SHEARING THROUGH ANY DOWNHOLE TOOLING AND MAINTAINING ITS SEAL CAPABILITY AFTER THE SHEARING OPERATION IS COMPLETE. THE GATE VALVE HAS A BODY WITH A FLOW PASSAGE THEREIN AND A GATE BEING LINEARLY MOVABLE BETWEEN A CLOSED POSITION BLOCKING FLOW THROUGH THE FLOW PASSAGE AND AN OPEN POSITION. FIRST AND SECOND VALVE SEATS ARE MOUNTED ON OPPOSITE SIDES OF THE GATE AND HAVE SEALING SURFACES THAT ENGAGE THE GATE WHEN THE GATE IS IN THE CLOSED POSITION. SHEAR ELEMENTS ARE CONNECTED TO AND CARRIED BY EACH OF THE VALVE SEATS AND ARE CAPABLE OF AXIAL MOVEMENT RELATIVE TO THE VALVE SEATS IN RESPONSE TO MOVEMENT OF THE GATE FROM THE OPEN POSITION TO THE CLOSED POSITION. (FIGURE 1)</p> |
