a gas lift valve has a flow restrictor , a valve part on one side of the flow restrictor , a flow deflector and a tubular member on another side of the flow restrictor , and a flapper valve on the side of the flow restrictor where the tubular member is located , the flapper valve being adjacent to the tubular member . when fluid flows into the gas lift valve at sufficient pressure , the valve part opens , the fluid flows through the flow restrictor and acts on the flow diverter thereby moving the tubular member and opening the flapper valve . the tubular member extends though the opening the flapper valve covered .