公开(公告)号：US4796705A

公开(公告)日：1989-01-10

申请号：US89522

申请日：1987-08-26

申请人： Michael A. Carmody ,  Jefferey J. Lembcke

发明人： Michael A. Carmody ,  Jefferey J. Lembcke

IPC分类号： E21B34/00 ,  E21B34/10

CPC分类号： E21B34/102 ,  E21B2034/005

摘要： In a safety valve having an axially shiftable actuating sleeve operable to move a valve head from a closed to an open position, the actuating movement of the actuating sleeve is normally produced by a small diameter piston mounted on an axially extending spindle secured to the valve housing and cooperating with a primary cylinder which is abuttingly secured to the actuating sleeve. A secondary spindle and cooperating cylinder are provided which are supplied with fluid pressure by an entirely separate line extending to the well surface. The second cylinder has only abutting contact with the actuating sleeve and may be utilized to effect the movement of the actuating sleeve in the event of the failure of the primary cylinder. In a modification, a fixed cylinder housing defines a pair of secondary cylinder bores in which secondary rod pistons are slidably mounted to effect the movement of the actuating sleeve. In both modifications, collet latches prevent return movement of the secondary cylinder or secondary rod pistons, thus locking the valve head in an open position.

摘要翻译： 在具有可轴向移动的致动套筒的安全阀中，可操作以将阀头从关闭位置移动到打开位置，致动套筒的致动运动通常由安装在轴向延伸的心轴上的小直径活塞产生，固定在阀壳体 并且与紧贴在致动套筒上的主缸相配合。 提供了一个辅助主轴和配合缸，它们通过延伸到井表面的完全独立的管线被提供流体压力。 第二气缸仅与致动套筒邻接接触，并且可用于在主气缸故障的情况下实现致动套筒的移动。 在一个变型中，固定的气缸壳体限定一对次级气缸孔，其中辅助活塞杆可滑动地安装以实现致动套筒的运动。 在两个变型中，夹头锁定件防止次级缸或辅助杆活塞的返回运动，从而将阀头锁定在打开位置。