초록 ▼

A bypass valve, particularly useful for allowing a tubing string to fill or drain during tripping in and tripping out, is disclosed. The bypass valve can be used in conjunction with a downhole motor operated through a tubing string. The bypass valve features a movable tapered valve member which has

A bypass valve, particularly useful for allowing a tubing string to fill or drain during tripping in and tripping out, is disclosed. The bypass valve can be used in conjunction with a downhole motor operated through a tubing string. The bypass valve features a movable tapered valve member which has a smaller taper than the valve seat to prevent dragging the sealing element across sharp edges as the valve closes. Ports are provided through the valve to conduct upstream pressure in the valve behind the sealing element so that upon contact of the sealing element on the valve member with the seat, a boost force is applied to help retain the seal.

대표청구항 ▼

[ I claim:] [1.] A sealing system for a valve, comprising:a body;a valve member movable in said body;a seat in said body;a seal for sealing between said valve body and said seat as a result of a mechanical force due to movement of said valve member toward said seat; anda fluid passage in flow commun

[ I claim:] [1.] A sealing system for a valve, comprising:a body;a valve member movable in said body;a seat in said body;a seal for sealing between said valve body and said seat as a result of a mechanical force due to movement of said valve member toward said seat; anda fluid passage in flow communication with said seal to direct pressure in said body against said seal to increase the force on said seal against said seat beyond said mechanical force.