FIELD: engines and pumps.
SUBSTANCE: proposed pump comprises valve with external drive guide. Said valve serves to adjust fluid flow to pump chamber via valve external drive guide that adds to adjustment. Said drive guide may included lever to enter the valve drive assembly under the valve. In these versions, said lever may reciprocate driven by crankshaft, hydraulic or other means. Alternatively, valve drive assembly may comprises electromagnetic means.
EFFECT: application at high-pressure hydrocarbons extraction jobs.
22 cl, 5 dwg
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