Gas Lift Valve - Injection Pressure Operated Valve (gas lift)
Gas Lift Valve - Injection Pressure Operated Valve (gas lift): gas lift valves where injection gas enters the valve and acts on the effective bellows area, overcoming the precharge in the valve and opening the valve (the retracting bellows lifts the needle off the seat) to allow gas lift gas flow from the gas filled annulus through the seat and the reverse flow check valve, and into the tubing.
Source: http://gekengineering.com/Downloads/Free_Downloads/Glossary_of_Petroleum_Engineering_Terms_25_August_2010.pdf
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Author of the text: George E. King Engineering
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