DARTT VALVE DOWNHOLE PUMP ACTUATOR

The reason a pump containing a Dartt® Valve operates when a pump without a Dartt® Valve will not is due to the physics of the operation of the travelling valve. The force to unseat the travelling valve is equal to the pressure within the pump in the downstroke times the ball area exposed to that pressure under the seat. Since the area under the seat is very small, the resulting force to unseat the ball is very small. The DARTT® VALVE exposes six times the ball area to the pressure within the pump, thus creating six times the original force to unseat the ball. Then, this "six times" force which is centered within the Dartt is offset and applied to the ball through the dual actions of an inclined plane and of a lever and fulcrum point ( one side of the seat becomes the fulcrum point as the DARTT® lifts the ball from the seat ). In this way, the force to open the ball is approximately four dozen times the original force to open the ball.

Because of this increased force, the DARTT® VALVE is able to lift the ball from the seat very early in the downstroke, and because of the fluid flow dynamics around the DARTT® plunger, the DARTT® VALVE is able to keep the ball off of the seat during the entire downstrokes, thus effectively placing everything within the pump barrel into the production column. By opening the traveling valve at the start of the downstroke, transient forces are not allowed to build up and effect the opening of the valve within the DARTT® VALVE back up the ball and seat. If a grain of sand, for example, were to lodge between the ball and seat, during the upstoke the three valves within the DARTT® VALVE would stand in for the travelling valve . Then, during the following downstroke the action of the DARTT® plunger would

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US PATENT NO.
5,533,876

cause the ball to unseat and wash the sand away, thus eliminating fluid wash damage and causing the pump to pump during every stroke, regardless of sand or gas content in the production fluid.

An explanation of fluid flow during the power stroke is in order to complete the operation of the DARTT® VALVE. During the entire upstroke, the DARTT® VALVE is in the down position with all three of its valves closed, thus assisting in pulling nearly a perfect vacuum. In the beginning of the downstroke, all three of the valves are still closed, and the pressure on the bottom of the DARTT® plunger begins to build, causing the DARTT® plunger to travel upward toward the traveling ball valve. After traveling approximately 115 of the way to the traveling valve, the bottom valve within the DARTT® VALVE opens, allowing fluid to flow past it and to begin to push against the underside of the top internal flange of the DARTT® plunger, continuing to force the DARTT® plunger upward, but with additional force. Soon thereafter the DARTT® plunger travels upward far enough to open the top valve, allowing fluid to contact the bottom of the traveling ball valve. Concurrently, the DARTT® plunger coasts, utilizing momentum energy to the ball, deflecting it upward and sideways, spinning the ball, and spinning the DARTT® plunger. The DARTT® plunger then makes contact with a 'Stop" within the DARTT® VALVE, stopping travel of the DARTT® plunger, and preventing damage to the traveling ball. Fluid flow around the flanges constructed onto the DARTT® plunger aerodynamically keep the DARTT® plunger in the upward position throughout the entire downstroke, keeping the traveling ball open during the entire downstroke as well, thus preventing ball dance damage to the ball and seat.

The opening of the traveling valve so early in the downstroke provides for a continuous volume from the standing valve all of the way to the surface within the production tubing, thus preventing a gas pocket within the pump through which the plunger could fall, and preventing fluid pound. This action also provides for a way that the pump can be lubricated from the production column if nothing was in the well to come through the standing valve in the last upstroke, thus the DARTT® VALVE helps to prevent pump destruction due to lack of lubrication.

Since your DARTT® VALVE fills the pump fully every stroke, fewer strokes per barrel of fluid produced are needed. This translates into reduced work, reduced pump wear, and reduced electric bills.

WE FEEL THAT THIS PUMP ACCESSORY IS THE MOST INNOVATIVE TOOL DEVELOPED FOR THE OIL FIELD IN RECENT HISTORY.

Standard metal type is 17.4 pH Stainless Steel. For specific chemical applications, valves made of other metals are available upon request.