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Multi-ratio pump - PowerPoint PPT Presentation


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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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Presentation Transcript
slide1
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

slide2
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide3
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide4
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide5
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide6
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide7
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide8
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide9
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide10
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

Low Ratio Mode

slide11
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

slide12
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

High Ratio Mode

KDRV Open

Low Ratio Mode

slide13
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

High Ratio Mode

KDRV Open

Low Ratio Mode

slide14
Pressure

Flow

Multi-ratio pump

Extends cylinder under moderate load with high flow

High Ratio Mode

KDRV Open

Low Ratio Mode

slide15
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

slide16
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

slide17
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

slide18
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

slide19
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

slide20
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

slide21
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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