The ROV wireline retrievable orifice valve is a 1" or 1-1/2" O.D. valve used to control the flow of gas and/or fluid from the casing annulus into the tubing. The valve is installed in side pocket mandrels. The valve is designed with a square edged orifice which, when properly sized, allows volume control when the casing and tubing pressures are known. An integral reverse flow check prevents gas and or fluid from flowing from the tubing back into the casing annulus. The ROV valve consists of a flow barrel, seat housing and floating square edged orifice, lower packing retainer, and check nose with a reverse flow check drop. The valve is constructed of premium materials for corrosion resistance in wells with high concentrations of H2S or CO2. Packing and elastomeric materials for the valve are available for standard service or special service to suit individual well conditions. The ROV orifice valve is available with square edged orifice sizes of 1/8" through 1/2" Lufkin's HR series orifice has a maximum port size of 7/16" for the ROV-1.0HR and 3/4" for the ROV-1.5HR.
In operation, gas and/or fluids that are injected into the casing annulus enter through the ports in the side pocket mandrel. This gas and/or fluid then enter through the ports in the valve that is located in the flow barrel between the two sets of packing. The gas and/or fluid then flows through the seat housing and square edged orifice, past the reverse flow check drop, through the check nose and into the tubing.