single or double punch?

[Patrick Gorza]

Good morning, everyone.
I am new, in the forum and passionate (but not experienced) of oleodynamics.
I have a question to ask, concerning the use of an oil pump.
question: at equal flow and pressure, if I have to choose between a single pump from 70 l/min and a double from 35+35 l/min which you recommend me and why?
I thank early those who can answer me, even if the question can be stupid.
Say hi.

Patrick.

 

[meccanicamg]

two pumps have a lower yield of only one double cylinder capacity. definitely can be more homogeneous the double pump in parallel than the single.
as cost....two cost more than one having double lantern, double joint....and the engine is not standard but double shaft.
However it also depends on what pump technology you use.

 

[Patrick Gorza]

two pumps have a lower yield of only one double cylinder capacity. definitely can be more homogeneous the double pump in parallel than the single.
as cost....two cost more than one having double lantern, double joint....and the engine is not standard but double shaft.
However it also depends on what pump technology you use.

thanks to the answer, mechanicalmg. I meant 2 pumps coupled to the same engine, so one lantern and one joint, but I think your answer is the same in this case. other clarification: if they feed both a hydraulic cylinder, at the moment of extreme pressure, when, because of the "differential" valve (I don't remember what it is called), a pump is excluded and only works the second, we will have less flow but also less effort on the engine, and therefore less decrease of turns, right?

 

[meccanicamg]

the aistycne say you are used mainly to connect two pumps with different displacements to get two different pressures/ports using only one motor. in your case if you have two equal displacements and turn on/off a pump you will have flow 1 or flow 1+2. certainly that if the flow rate is half at equal pressure you get half the necessary power. or if you see it so you can have more pressure on the load side to get to the nominal power of the engine.

 

[PIETRO2002]

thanks to the answer, mechanicalmg. I meant 2 pumps coupled to the same engine, so one lantern and one joint, but I think your answer is the same in this case. other clarification: if they feed both a hydraulic cylinder, at the moment of extreme pressure, when, because of the "differential" valve (I don't remember what it is called), a pump is excluded and only works the second, we will have less flow but also less effort on the engine, and therefore less decrease of turns, right?

depends also on the cycle of your operating machine, perhaps in some phases a small flow to a certain pressure and in other phases the two pumps are indispensable.

 

[Patrick Gorza]

depends also on the cycle of your operating machine, perhaps in some phases a small flow to a certain pressure and in other phases the two pumps are indispensable.

Thank you pietro.