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How is Hydraulic Pressure Accomplished?

08/15/2013 5:16 PM

I know what hydraulic force is, and how to calculate it. I need to know how to multiply and calculate hydraulic PRESSURE in terms of pounds per square inch [psi]. Most internet inquiries concentrate on hydraulic force, and do not answer my questions on hydraulic pressure multiplication.

Origo, U.S.A.

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#1

Re: How is hydraulic pressure accomplished?

08/15/2013 5:20 PM

Are you serious?

What does one pound of pressure applied to one square inch of area equal in PSI?

Please do another search in your text book, page 234.

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#2

Re: How is hydraulic pressure accomplished?

08/15/2013 5:41 PM

Our friend Origo, if a student, is indeed a nonconventional student. He is a veteran, having served in the US Navy during WWII.

"I need to know how to multiply and calculate hydraulic PRESSURE in terms of pounds per square inch" I don't quite get what you are after... as in hydraulic head?

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#3

Re: How is hydraulic pressure accomplished?

08/15/2013 6:25 PM

Fluid is essentially non-compressable.

Therefore, the pressure applied by the hydraulic system IS the pressure of the fluid.

You would then take the advice of Lyn (or part of it) to determine your mechanical advantage.

Is this what you are asking ?

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#7
In reply to #3

Re: How is hydraulic pressure accomplished?

08/15/2013 8:14 PM

most fluids resist being compressed try gasses if you want that

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#8
In reply to #7

Re: How is hydraulic pressure accomplished?

08/15/2013 8:31 PM

I said: Fluid is essentially non-compressable.

You said: most fluids resist being compressed

I think we're on the same page here Fredski.

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#9
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Re: How is hydraulic pressure accomplished?

08/15/2013 9:10 PM

Liquids are essentially non-compressible. Fluids include both liquids and gasses.

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#10
In reply to #9

Re: How is hydraulic pressure accomplished?

08/15/2013 9:21 PM

Cut me some slack RF...it's Florida and I'm hot...

From Wiki: Although the term "fluid" includes both the liquid and gas phases, in common usage, "fluid" is often used as a synonym for "liquid", with no implication that gas could also be present.

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#14
In reply to #10

Re: How is hydraulic pressure accomplished?

08/16/2013 5:56 AM

I don't know why this is being discussed. The relationship between pressure/force/area is the same for compressible and non-compressible fluids

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#15
In reply to #14

Re: How is hydraulic pressure accomplished?

08/16/2013 8:16 AM

I just don't want anyone embarrassing themselves by going into a Tractor Supply store asking for hydraulic "liquid".

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#18
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Re: How is hydraulic pressure accomplished?

08/16/2013 9:54 AM

Asking for hydraulic gas would be worse!

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#4

Re: How is hydraulic pressure accomplished?

08/15/2013 7:42 PM
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#5

Re: How is hydraulic pressure accomplished?

08/15/2013 8:06 PM

These should help...."Pascal's law states that when there is an increase in pressure at any point in a confined fluid, there is an equal increase at every other point in the container."

http://www.grc.nasa.gov/WWW/K-12/WindTunnel/Activities/Pascals_principle.html

http://www.hydraulicmania.com/

http://en.wikipedia.org/wiki/Hydraulics

http://hydraulik.empass.biz/

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#6

Re: How is hydraulic pressure accomplished?

08/15/2013 8:11 PM

P = F/A

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#11

Re: How is hydraulic pressure accomplished?

08/15/2013 10:19 PM

If you know the force divide by the area and the resulting number is the pressure. Note to self- if I can't find the information I am looking for on the Internet maybe I am asking for the wrong thing. Must remember this!

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#12

Re: How is hydraulic pressure accomplished?

08/16/2013 3:15 AM

There are numerous ways of calculating pressure in one scale to pressure in another. Try this:

http://www.simetric.co.uk/

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#13

Re: How is hydraulic pressure accomplished?

08/16/2013 4:37 AM
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#16

Re: How is Hydraulic Pressure Multiplied?

08/16/2013 8:25 AM

My mistake in the title. Evidently my text was not published by CR4. I should have worded the title as: "How is hydraulic pressure multiplied." In my text, I explained that most internet answers to my question reply about hydraulic force--not hydraulic pressure multiplication.

Origo, U.S.A.

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#17
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Re: How is Hydraulic Pressure Multiplied?

08/16/2013 9:25 AM
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#19
In reply to #16

Re: How is Hydraulic Pressure Multiplied?

08/16/2013 1:00 PM

I think that an explanation is required: hydraulic pressure is the consequence of a outer resistance to the linear or rotatory motor.

One cannot program a pressure without a resistance which can be as well the container wall resistance to the pumped fluid.

One can only regulate or limit a pressure according to process or safety constrains.

If considering above statement the force generates the pressure and the system allows a pressure -if a limiter does not interfere- high enough to counter the force.

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#21
In reply to #16

Re: How is Hydraulic Pressure Multiplied?

08/16/2013 11:30 PM

I still don't know what you really want that wasn't explained by TerraMan first, then others.

What is your ultimate objective?? Do you have some goal in mind??

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#22
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Re: How is Hydraulic Pressure Multiplied?

08/16/2013 11:41 PM

You mean an objective beyond looking for the answer to a dumb question without looking stupid. Personally, I chock this question up to one of those conundrums that happens from language translation.

Oh look, another little glass full of Knob Creek. I must savior it before it evaporates.

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#20

Re: How is Hydraulic Pressure Accomplished?

08/16/2013 10:52 PM

I think you guys know so much that you think everyone knows it too. Origo, if I'm not mistaken, is trying to ask how to derive the total force on a piston at a particular hydraulic pressure, or perhaps the force multiplication when a little piston increases the pressure with a little force on the piston, and a big piston with a big area presented to the fluid then exerts a big force (and of course a correspondingly smaller movement) on whatever the big piston is pushing. What say, Origo?

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#23
In reply to #20

Re: How is Hydraulic Pressure Accomplished?

08/16/2013 11:56 PM

Here is the image of the concept that comes into my mind when I hear the question:

A good explanation with formulas is provided where I got the imge on this link: http://www.aplusphysics.com/courses/honors/fluids/Pascal.html

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#25
In reply to #23

Re: How is Hydraulic Pressure Accomplished?

08/17/2013 8:03 PM

But what happens if you reverse this?

i.e. put the force IN at F2 to use the force from piston F1 ?

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#24
In reply to #20

Re: How is Hydraulic Pressure Accomplished?

08/17/2013 6:16 AM

It is possible, of course, that the OP is genuinely seeking a means of pressure multiplication rather than force multiplication. A pressure of 1 kg-force/cm^2 within a hydraulic cylinder of 10 cm^2 cross-section acts on a piston. The force on that piston is 10kg. That piston has a circular extension of 1 cm^2 cross-section which serves as a piston in another hydraulic chamber. The pressure in that chamber is 10 kg/cm^2.

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#26

Re: How is Hydraulic Pressure Accomplished?

08/22/2013 1:50 AM

...Could somebody explain "Hydraulic Force"-what does it mean?

Allegorically of course...

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#27
In reply to #26

Re: How is Hydraulic Pressure Accomplished?

08/22/2013 1:37 PM

Step on a water balloon. Hydro from Greek means water. Its the force applied by your foot that the water inside the water balloon receives between the floor and your foot that is spread out uniformly to the total surface area of the balloon. Your foot applied the force, but the hydraulic force it that force of the water against the sides of the balloon.

In the case of a water balloon, there is always (unless the water is frozen) a hydraulic force present. You can prove this by pricking the balloon with a pin. If it pops, the force is violently released. If you only punch a hole in it, a stream of water will flow out with that force until the force drops to zero. Then some water will remain inside, because the balloon has a normal volume before compression.

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Users who posted comments:

1tech (1); Codemaster (2); Doorman (1); Fredski (2); Jacob Klepatch (1); jt (1); lyn (3); nick name (1); Origo (1); ormondotvos (1); phph001 (1); PWSlack (1); redfred (2); SolarEagle (1); TerraMan (1); Tornado (1); WhiteHorse (2); WJMFIRE (4)

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