March 1998
Industry At A Glance
98-03_lift-pt1-lea_6.html (Mar-1998)
A monthly magazine offering industry news, statistics and technical editorial to the oil and gas drilling, exploration and production industry.
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Fig. 6. Schematic of Dartt valve located below traveling valve. On the downstroke, as shown, the metal actuator is moved upward by fluid pressure and its angled upper end pushes the ball open, even in potential gas-locking conditions. |
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FROM THE ARCHIVE
Copyright © 1999 World Oil
Copyright © 1999 Gulf Publishing Company
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