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 of 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.

The installation of a DARTTŪ VALVE backs up the traveling valve in operation . When the traveling valve ball has floated off the seat in the heavy crude and the pump is in the up stroke, the DARTTŪ VALVE performs the job of closing the bottom of the plunger so that more crude can be sucked into the pump through the standing valve. Also, when the surface tension of the heavy crude has practically glued the traveling valve ball to its seat and the pump is in the down stroke, the DARTTŪ VALVE forces the traveling valve to open. Thus, the installation of a DARTTŪ VALVE in heavy crude increases production and, in some wells, makes production possible where it would be impossible without the DARTTŪ VALVE.

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