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pump for pressure control

pump for pressure control

pump for pressure control

(OP)
Hi guys,

I've got a rotary pump which has a built in bypass valve and is normally used in beverage machines. You can set the bypass valve to lower the maximum pressure to pretty much whatever value you want, but it still pumps a lot of water, somewhere in the range of 170L/h. It is powered by a small 250W motor with a start capacitor (single phase obviously).

Now I'd like to control the pressure fully, but without touching the bypass valve and while the pump is working. The range that interests me is 1-9bar with precise control (most likely digital). Is there any pump on the market that would be suitable for this?

Regards,
Tom

RE: pump for pressure control

Finally a perfect application for VFD???

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: pump for pressure control

Someone call a doctor, BigInch is sick... tongue

Slightly more seriously a capacitor start motor is not compatible with a VFD. If you do want to go the VFD route you would have much better options if you have a three phase motor. Of course, changing the motor might make the economics of using the VFD fall apart...
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: pump for pressure control

Do you wish to maintain the same flow at the different pressures?

RE: pump for pressure control

(OP)
Hi guys,

no, the same flow is not necessary.

Regards,
Tom

RE: pump for pressure control

Ya. I always get sick thinking of VFDs.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: pump for pressure control

The original question was;

"Is there any pump on the market that would be suitable for this?"

Probably yes, have you contacted any manufacturers / sellers of this pump type - always a good place to start.

RE: pump for pressure control

I'll be more clear.  Keep the same pump; add a VFD.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: pump for pressure control

Just as clearly: that motor is not compatible with a VFD. Keep the pump, change the motor.
  

----------------------------------
  
If we learn from our mistakes I'm getting a great education!
 

RE: pump for pressure control

I'll take your word for that.
So, keep the pump, change the motor and add a VFD.

**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

RE: pump for pressure control

You would actually want a small BLDC motor with a drive to control it. This would not be a conventional VFD..

Keith Cress
kcress - http://www.flaminsystems.com

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