B / H EQUALIZING SUB

Description

The Type “B” and “H” Equalizing Subs allow an equalization of a pressure differential across a locking mandrel so that the locking mandrel can be safely and properly retrieved. It alsoprovides a means to allow fluid to bypass around a locking mandrel as it is lowered into a landing nipple. A running prong and pulling prong are needed to equalize these subs. The prong lifts a spring loaded equalizing dart off “seat” which will alllow either fluid bypass or pressure equalizing. The Type “B” and “H” subs are identical except the internal diameters of the “H” subs are larger than the “B” subs.