Abstract
A gas lift valve for use in a wellbore has a housing with an injection fluid inlet port and an injection fluid outlet connected to a production tubing. The gas lift valve has a sealing ball engaged with a valve seat, and the sealing ball is disengaged from the valve seat to open a pathway from the injection fluid inlet through the injection fluid outlet into the production tubing solely as a result of injection fluid pressure in an annulus between the housing and the wellbore.