초록

A gate valve for cutting a wire line (20) and closing in a well has a gate assembly (24) formed of an upper gate (32) and a lower gate (34). The lower gate (34) closes first shearing the wire line. Upper gate (32) closes second and seals against upper valve seat (42).

대표청구항 ▼

A gate valve for cutting an elongated suspension member extending therethrough, and closing in a well, comprising: a valve body having a vertical passage therethrough, and adapted to be mounted on a wellhead; a gate assembly slidably mounted in said valve body for horizontal movement between an open

A gate valve for cutting an elongated suspension member extending therethrough, and closing in a well, comprising: a valve body having a vertical passage therethrough, and adapted to be mounted on a wellhead; a gate assembly slidably mounted in said valve body for horizontal movement between an open and closed position; an actuator connected to said gate assembly for moving said gate assembly to and from said open and closed positions; connection means connecting said actuator and said gate assembly; said gate assembly comprising an upper gate and a parallel lower gate; each of said gates having a flow port therethrough alignable with said vertical flow passage in the open position; said valve body including valve seats adjacent said gate assembly, said valve seats cooperating with said gate assembly to close said vertical flow passage in a closed position, and at least one of said gates cooperating with one of said seats to seal said vertical flow path in the closed position; and said connection means including a lost motion connection to one of said gates whereby on closing of said valve one of said gates moves ahead of the other so that any elongate member passing through said valve is first sheared by only one gate.