Dual Reverse Circulating Valve
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Brief introduction
Dual Reverse Circulating Valve is one type of reverse circulating valve which could operate by internal pressure and repeatedly close/open. Apply some times of internal increased pressure to open, and close again by direct circulation. It could be used in many operations. As liquid replacement valve, to inject liquid when it is open. As close valve in acidification and fracturing, to circulate liquid out of tubing. It also could be used for pipe internal pressure test in running.
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Structure feature
When valve is open, fill liquid by string tool to return from annulus and close. There are four circulating ports on bottom nipple, internal pressure will be increased as liquid moving through ports and force mandrel movement to lower dead point. Close again. The valve has no response for annulus velocity of flow, could not be closed again by reversing circulation.
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Technical specification
Size OD (mm) ID (mm) Length (mm) Circulating port area (mm2) Working differential pressure (MPa) Thread connection 5’’ Ф127 Ф57 3055 140~560 70 3 1/2’’IF. B×P 5 1/2’’ Ф136.5 Ф62 3055 6 1/8’’ Ф155.5 Ф73 3846.5