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Multi-ratio pump

Pressure. Flow. Multi-ratio pump. Extends cylinder under moderate load with high flow. Note: If slides do not advance automatically, use the left mouse button or left arrow key. Low Ratio Mode. Pressure. Flow. Multi-ratio pump. Extends cylinder under moderate load with high flow.

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Multi-ratio pump

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  1. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Note: If slides do not advance automatically, use the left mouse button or left arrow key Low Ratio Mode

  2. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  3. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  4. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  5. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  6. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  7. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  8. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  9. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  10. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow Low Ratio Mode

  11. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow When resistance is met, pump kicks into high pressure mode High Ratio Mode KDRV Open Low Ratio Mode

  12. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow High Ratio Mode KDRV Open Low Ratio Mode

  13. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow High Ratio Mode KDRV Open Low Ratio Mode

  14. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow High Ratio Mode KDRV Open Low Ratio Mode

  15. Pressure Flow Multi-ratio pump Extends cylinder under moderate load with high flow High Ratio Mode KDRV Open Low Ratio Mode Click to advance to next slide

  16. Multi-ratio pump – how it works The cylinder moves rapidly under low load using the area of the hydraulic piston rod Oil Pressure Out (Low Ratio) CVP2 CVP1 Air Pressure In CVS1 KDRV (Closed) Tank Exhaust Click to advance to next slide

  17. When resistance is met and pressure builds, KDRV opens and fluid on the “push” stroke goes back to the tank. CVP2 CVP1 Air Pressure In CVS1 KDRV (Open) Tank Exhaust Click to advance to next slide

  18. Sec. AA On the “pull” stroke, the KDRV is closed to allow for fluid to fill on the “push” side. The ratio on this stroke is based on the piston diameter minus the rod diameter Oil Pressure Out (High Ratio) “Pull” area based on piston dia. – rod dia. CVP2 CVP1 A Exhaust A CVS1 KDRV (Closed) Tank During the “pull” stroke, the fluid exits in the high mode Air Pressure In Click to advance to next slide

  19. Multi-ratio Pump Example The air piston diameter = 3.569 in The hydraulic rod diameter = .798 in The hydraulic bore diameter = 0.874 in The air piston area = p/4 x D2 = 10 in2, The hydraulic rod area = 0.5 in2 The hydraulic bore area = 0.6 in2 The ratio on the push stroke is 10/0.5 = 20:1 The ratio on the pull stroke is 10/(0.6-0.5) = 100:1 This pump will act like a 20:1 unit until the KDRV opens and then it will perform as a 100:1 unit Click to advance to next slide

  20. Multi-ratio pumps allow for rapid cylinder extension with a high flow, low ratio mode at low to moderate loads, employing the high pressure mode only when needed at the end of the stroke Pressure vs. Flow Multi-ratio Pump Pressure High Ratio Mode KDRV Open Low Ratio Mode Flow Click to advance to next slide

  21. Performs functions of two pumps • Saves time and energy • Conserves compressed air • Flows to 6 GPM • Pressures to 10,000 psi Summary of Multi-Ratio Pumps: Click to start over…

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