Why will it assist in pumping heavy crude?
In most heavy crude production, conventional balls float off their seats as if suspended in a weightless environment, thus preventing the pump from loading during the up stroke. Further, in crudes having gravities 10-18, problems have been recorded of the traveling valve at times sticking closed due to the surface tension between the ball and seat. While these problems, when viewed from the surface, seem to indicate gas lock, what is actually happening within the pump is the exact opposite of gas lock. Only the symptoms are the same.
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