working principle of (DR)pressure control variable displacement pump 3

[naphty]

Hi Members

Need some tips on 'the working principle of pressure control variable displacement pump (rexroth brand)'. I just don't get it for some reason.

 

[micalbrch]

Try this and select the pdf documents that fits to what you are looking for.

http://www.boschrexroth.com/country...ial_piston_units/02_variable_pumps_/index.jsp

 

[BigInch]

variable displacement changes the volume of the cylinder, or other relevant volume depending on what kind of pump you have, enabling you to keep the same speed, for example, while changing the flowrate, thereby varying the power being consumed. It is always handy to be able to adjust the pump in some manner to the flow and head that you need at any given moment, thereby consuming no more than the power you need to do what you want to do. That is ususally done by varying speed, or if that isn't convenient, you can vary capacity by changing the shape of the pump. With a variable dislacement pump, you change the shape and thereby the volume of the cylinder, taking more, or less fluid mass to match your exact needs. If you couldn't do that, either excess power would be converted to heat and efficiency decreases when you can't match the discharge flow, or cavitation might occur if the pump was trying to take too much fluid off the suction side, and damage or inefficiencies would follow.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

 

[hydtools]

See this youtube video:

http://www.youtube.com/watch?v=_CnIP85oY3o

Ted

 

[hydtools]

This is from Parker, but the same principle:

http://www.parker.com/literature/Li.../Acrobat/Industrialtrainingtemplatebasics.pdf

Ted

 

[naphty]

Hi Members

Thanks to you all for this tip - Big Inch, Hydtools, micalbrch.

Naphty