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Like the
conventional gas lift valves, UNITED line of wireline
retrievable gas lift valves include, casing-pressure-operated,
tubing-pressure operated (fluid-operated) types and dummy valves in a full
selection of sizes. Each valve has a large dome volume and Monel multi-ply
bellows. Every valve is constructed of stainless steel and monel, selected
on the basis of corrosion resistance and strength. Bellows are
silver-soldered by induction soldering technique and all valves are factory
tested for high reliability.
Wireline
retrievable gas lift valves provide self-contained packing as a sealing
means in retrievable mandrels and each valve has integral check-valve to
prevent flow between tubing and casing.
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