Variable Pressure: Is Piston Pump the Answer?

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Discussion Overview

The discussion revolves around the introduction of variable pressure into a system, specifically exploring the use of piston pumps to achieve controlled fluctuating pressures. Participants are examining the feasibility of this approach in the context of an experiment involving pressure fluctuations and the challenges associated with generating these fluctuations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant proposes using piston pumps running at low RPMs to achieve controlled fluctuating pressures.
  • Another participant requests more detailed information about the system's requirements, including flow rates, pressures, and design constraints, questioning the choice of a piston pump.
  • A participant describes their experiment involving a stepper motor and cam arrangement to create pressure pulses but notes difficulties in achieving higher frequencies of pressure oscillations.
  • Concerns are raised about the type of fluid being used (water or oil) and the specific pressures involved in the system.
  • Another participant suggests the possibility of using a fast-acting valve to create pressure pulsations instead of relying solely on a piston pump.

Areas of Agreement / Disagreement

Participants express varying viewpoints on the effectiveness of piston pumps for generating variable pressure, with some suggesting alternative methods like using valves. The discussion remains unresolved regarding the best approach to achieve the desired pressure fluctuations.

Contextual Notes

Participants have not provided complete specifications for the system, such as the exact pressures required or the type of fluid, which may affect the proposed solutions. There is also uncertainty about the feasibility of achieving the desired frequency of pressure oscillations with the current setup.

banerjeerupak
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I need to introduce variable pressure into a system. I was planning on using piston pumps which if i run at low rpms would result in controlled fluctuating pressures. Am i doing something wrong?
 
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We need an awful lot more information about the system and its requirements. Do you have a diagram? What is the purpose? What are the flow rates and pressures? What design constraints do you have? Why are you using a piston pump?
 
I am working on an experiment where i would like to see how the system responds to pressure fluctuations.

I tried using a stepper motor and a cam arrangement to create pulses in the pipe carrying water to the system. However, I can't get higher frequencies of pressure oscillations.

I have flow rates in the range of 0.01 to 0.09 ml / min. I have a syringe pump to take care of that. However, I am unable to figure out how to introduce pressure oscillations into the system.

That is when i thought a piston pump working at low rpm may do the trick. The pressure need not be fixed, but should be consistent.

Hope this info is more adequate.

Thanks
 
banerjeerupak said:
I am working on an experiment where i would like to see how the system responds to pressure fluctuations.

I tried using a stepper motor and a cam arrangement to create pulses in the pipe carrying water to the system. However, I can't get higher frequencies of pressure oscillations.

I have flow rates in the range of 0.01 to 0.09 ml / min. I have a syringe pump to take care of that. However, I am unable to figure out how to introduce pressure oscillations into the system.

That is when i thought a piston pump working at low rpm may do the trick. The pressure need not be fixed, but should be consistent.

Hope this info is more adequate.

Thanks

What kind of pressures are we talking? Is this a water or oil system?
 
What frequency of pulsation do you need? Can you create the pulsations using a valve? All you would need is a valve capable of acting fast enough, then open/close the valve quickly to get a pressure pulse.
 

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