Another "myth to kill"??.....what makes it go???

[AKKAMAAN]

Here is another "challenge" to all of you....
Have you ever heard about "flow makes it go"??
IS IT A MYTH??
Can you guys tell me your "take" on this one??

 

[Transit]

Make what go?

 

[AKKAMAAN]

Make what go?

Oh sorry Transit....this is obvious when you have once come across this saying "flow makes it go"....

You are a lucky guy if you never heard about it.....


It relates to the hydraulic cylinder, motor or what ever hydraulic actuator there is to move....

 

[Egon]

"flow makes it go"??
IS IT A MYTH??

That was certainly true with the Dynaflow.:thumbsup:

 

[bcp]

Pressure makes the flow make it go.

Bruce

 

[LPitt]

gpm gives you speed and psi gives you power. Of course a lot of other factors must be considered, but as a general rule thats the case.

 

[SPYDERLK]

differential pressure causes it to move ... moving allows flow

 

[AKKAMAAN]

Hint...
Newton's first law of motion.....
"Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it."

 

[wdchyd]

gpm gives you speed and psi gives you power. Of course a lot of other factors must be considered, but as a general rule thats the case.

:thumbsup:....

 

[brain55]

Having had to troubleshoot many hydraulic problems over the years, flow by itself won't do any work. It is the ability to make flow under pressure that does the work. I have tested many hydraulic pumps with a flowmeter that would make the recommended flow with no pressure, but as soon as you introduce a restriction, that flow it would drop to nothing. Most pumps are rated with a static flow at a given RPM and are expected to still flow at least 80% of that, up to the system relief pressure. Which also shows that pressure alone won't do any work, considering with the same flowmeter I can stop the flow and still have pressure.

Brian

 

[SPYDERLK]

Area is implicit of course.

 

[mmurphy]

I will say yes. Of course pressure is needed to overcome the load. If I remember right, a pumps job is to produce flow primarily, and pressure is secondary.
Pressure that has no flow= no work, but potential work.

 

[Egon]

If the river is flowing the Ram pump may be pumping as well as waterwheels turning various equipment.

But mainly it seems to be the state of the energy and it's application.:thumbsup:

 

[AKKAMAAN]

hint#2....
How can objects (a load) move where there is no "flow" available???

 

[brain55]

hint#2....
How can objects (a load) move where there is no "flow" available???

They can't.

Brian

edit- Back to the original question. Flow alone can make it go as long as as there is no resistance or load.

 

[mmurphy]

hint#2....
How can objects (a load) move where there is no "flow" available???

Parasitic, weight, and leakage.(or a damned good magician!)

 

[AKKAMAAN]

They can't.

Brian

edit- Back to the original question. Flow alone can make it go as long as as there is no resistance or load.

yes objects can move with out flow.....it happens all the time...my wheel barrel moves without hydraulic flow....and so do everything else that moves from just a force....
read Newtons first law again.....only force is required to move an object....

 

[J_J]

If no flow, then no go. You could have pressure, you could have volume, but if the fluid is not moving, you have a static situation, such as an accumulator. The potential for work is there. A weighted load is another way to push fluid, and could exceed the pressure of a pump. When you ram that bucket into a dirt pile or a stump, the back pressure could exceed the pressure rating of any component in the hyd system.

 

[J_J]

hint#2....
How can objects (a load) move where there is no "flow" available???

I thought we were talking hydraulics here.

{ Wheel barrel } ?

 

[Egon]

Depends on how "Slippery the Slope" is!:thumbsup: