Abstract: A water injection valve for use in a well bore having a cylindrical valve body with an axial water passage, a cylinder slidably mounted therein with an upstream control shoulder, lateral fluid ports in the cylinder upstream of the seal between the cylinder and the valve body and an open downstream end which restricts fluid flow when the cylinder impinges upon a conical valve seat. The cylinder is adjustably biased away from the valve seat by a spring and permits fluid flow no greater than a predetermined maximum rate despite increases in pressure differential across the valve.

Abstract: A gas lift valve is characterized by a valve element biased to the first, closed, position within a valve housing by an extension spring biasing element. In the closed position the valve element interdicts communication between an annular region disposed externally to a production tubing string and the interior of the tubing string. A bellows arrangement may be provided and may have a fluid therewithin able to be pressurized to a predetermined pressure level to assist the spring biasing element in biasing the valve to the closed position. The extension spring element is disposed witin the valve housing above the bellows element. The valve element is itself physically disconnected from, but abutted against a bellows sub element which transmits the closing force to the valve element when the valve element is in the closed position.

Abstract: A mandrel valve and gas lift valve mechanism that is adapted to be interconnected in a production tubing string within a well in order to produce fluid from the well under conventional gas lift methods. The gas lift valve includes a housing carried by a mandrel. The housing has a ball type valve element disposed in a valve chamber. Within the mandrel there is a linearly moving valve actuating sleeve having a cam which coacts with a stem on the ball valve so that linear movement of the sleeve causes rotation of the ball valve.

Abstract: A mandrel valve and gas lift valve mechanism that is adapted to be interconnected in a production tubing string within a well in order to produce fluid from the well under conventional gas lift methods. A plurality of gas lift valve mechanisms, which may be referred to as mandrel assemblies, may be dispersed or spaced in accordance with any suitable gas lift system design or, if desired, may be connected in end-to-end relationship defining a cluster of gas lift valves at each of several levels within the well. Each of the mandrel assemblies may include a gas lift valve and a mandrel valve that function to produce fluid only when the mandrel valve is open. Certain ones of the mandrel valves may be maintained in the open condition thereof while others of the valves may remain selectively closed during production operation.