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Motor or solenoid

Discussion in 'Sensors and Actuators' started by baan, Jan 13, 2011.

  1. baan

    baan

    5
    0
    Jan 13, 2011
    Hi everybody,

    I am not too good in electronics, that is why I ask you for an advice. For my Study I have the following dilemma:

    I have designed a pipesystem, in this system a fluid will flow. But the fluid needs to be dosed. To do this there are some valve in the pipe(these can either be rotational valve or linear)

    As mentioned in the titel, I am doubting to pick a motor or a solenoid(soft shift?) The choice has to be based on reliability/price/accuracy

    Some points are:
    - Fluids are under 3bar/40psi pressure,
    - The valve can be rotational or linear,
    - The solution has to be affordable, reliable and accurate.

    The problem is that my knowledge is not sufficient to make a decent choice. I hope some of you can help me?

    Thanks in advance,

    Hendrik
     
  2. shrtrnd

    shrtrnd

    3,676
    454
    Jan 15, 2010
    Don't know your application or metering of the dosing. If dosing needs to be precise,
    consider using a peristalic (metering) pump, if the dosing is also a fluid. There are
    other methods if you're introducing a powder to the fluid flow.
    What kind of additional information can you provide on the introduction of the dosing to
    the fluid flow?
     
    Last edited: Jan 13, 2011
  3. baan

    baan

    5
    0
    Jan 13, 2011
    The fluid will be water, do you need more information?
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,217
    2,695
    Jan 21, 2010
    Look for an electrically operated valve that is rated for continuous operation at around 5 Bar.

    Look at the specs for reticulation valves. They typically have to withstand full mains water pressure, and that is often well in excess of 5 Bar. They're also cheap because they're so common.
     
  5. KMoffett

    KMoffett

    689
    68
    Jan 21, 2009
    What volume are the doses? How accurate must the dose be. How frequently does the dose occur? Is the dose fed against a back pressure at the outlet, or to atmosphere? Is the only measure of dose, volume through drop in pressure over a time period? What size piping are you using? ?????

    It might help if you explained your over all project...what the whole system is designed to accomplish. It's often easier for people here to help solve your problem, than help solve your solution. ;)

    Ken
     
  6. baan

    baan

    5
    0
    Jan 13, 2011
    Hello Ken,

    The whole project is about dosing and mixing 2 waters with different temperatures, for a new type of faucet.

    What volume are the doses?
    From 100mL to 20L, I assume you work in oz. so 3,38oz. to 676 oz.

    How accurate must the dose be?
    It must be quite aqqurate ±10mL or 0,3 oz.

    How frequently does the dose occur?
    It is a kitchen faucet, so 10 times a day

    Is the dose fed against a back pressure at the outlet, or to atmosphere?
    I assume is is atmosphere, but I am not sure

    Is the only measure of dose, volume through drop in pressure over a time period?
    There will be a flow meter, which is also linked to the valve of course.

    What size piping are you using? ?????
    The innerdiameter is 12mm

    I hope this is enough information, to determine which kind of motor or solenoid will be the best solution to control the valves..
     
  7. KMoffett

    KMoffett

    689
    68
    Jan 21, 2009
    Is this a design for commercial use, or a class or personal project?

    I think "dosing" may be the wrong approach. Dosing would imply a fixed amount of water from each water supply to achieve a final water temperature. But, it sounds like you are trying to maintain a constant water temperature from a faucet that may have a variable total flow rate...the kitchen faucet. I use flow rates from a trickle to full-on my kitchen.
    First, for volume mixing to maintain a given temperature you would have to have both water supplies at known fixed temperatures. My hot and cold water supplies' temperatures vary all over the map through the year...summer to winter in Minnesota.
    To me, a temp sensor (or three), a microprocessor, and two linear-proportioning solenoid valves would be a better way to go.
    But then, I may be just making too many assumptions about your end goal.

    Ken
     
  8. baan

    baan

    5
    0
    Jan 13, 2011
    Hi Ken,

    I guess you just described my whole system:
    To me, a temp sensor (or three), a microprocessor, and two linear-proportioning solenoid valves would be a better way to go.

    So in your opinion it is the best way to use the linear proportioning solenoid? To control the flow/amount, together with a flow control sensor and microprosesor?

    Hendrik
     
  9. KMoffett

    KMoffett

    689
    68
    Jan 21, 2009
    Actually, I don't know if you would need a flow sensor at all. Again, an assumption: a person walks up to the kitchen sink, selects (???) the water temperature they want, then opens/adjusts a single flow control valve by turning a knob or moving a lever. The total flow is set by this valve. The temp sensors and microcontroller then adjust the proportioning valves to give the right temperature at the faucet. Does fit your scenario?

    Ken
     
  10. baan

    baan

    5
    0
    Jan 13, 2011
    Thanks for your comment Ken and thinking along.

    Actually we also want people to be able to adjust there amount, so they can choice to have for instance 200 ml(6.7oz.) of water. That is why I wanted to add a flow sensor.

    Hendrik
     
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