21
Multi-ratio pump Extends cylinder under moderate load with high flow Flow Pressure Low Ratio Mode Note: If slides do not advance automatically, use the left mou button or left arrow key
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Note: If slides do not advanceautomatically, use the left mousebutton or left arrow key
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
When resistance is met, pump kicks into high pressure mode
KDRV Open
Hig
h R
atio
Mod
e
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
KDRV Open
Hig
h R
atio
Mod
e
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
KDRV Open
Hig
h R
atio
Mod
e
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
KDRV Open
Hig
h R
atio
Mod
e
Multi-ratio pump
Extends cylinder under moderate load with high flow
Flow
Pres
sure
Low Ratio Mode
KDRV Open
Hig
h R
atio
Mod
e
Click to advance to next slide
Air Pressure In
ExhaustTank
KDRV(Closed)
CVS1
CVP1CVP2
Click to advance to next slide
The cylinder moves rapidly under low loadusing the area of the hydraulic piston rod
Multi-ratio pump – how it works
Oil Pressure Out(Low Ratio)
Air Pressure In
ExhaustTank
KDRV(Open)
CVS1
CVP1CVP2
When resistance is met and pressure builds,KDRV opens and fluid on the “push” strokegoes back to the tank.
Click to advance to next slide
Oil Pressure Out(High Ratio)
Air Pressure In
Exhaust
Tank
KDRV(Closed)
CVS1
CVP1CVP2
On the “pull” stroke, the KDRV is closed to allow forfluid to fill on the “push” side. The ratio on this stroke isbased on the piston diameter minus the rod diameter
During the “pull” stroke, the fluidexits in the high mode
“Pull” area based onpiston dia. – rod dia.
A
A
Sec. AA
Click to advance to next slide
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 = /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 = 20:1The 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
Multi-ratio pumps allow for rapid cylinder extensionwith a high flow, low ratio mode at low to moderate loads, employing the high pressure mode only whenneeded at the end of the stroke
KDRV Open
Low Ratio Mode
Hig
h R
atio
Mod
e
Flow
Pres
sure
Pressure vs. FlowMulti-ratio Pump
Click to advance to next slide
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…
