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LS Bleed Down Orifice

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  • LS Bleed Down Orifice

    Hi gang:

    I was looking through some load sense pump designs, and noticed you can get the option for a blocked load sense bleed down orifice. Under what circumstances would you want the bleed down orifice blocked? Thanks,

  • #2
    Response reason maybe...
    See Eaton video...
    What happens when you no longer need a load sense bleed down orifice?

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    • #3
      I saw that video. My guess is that blocking the bleed-down in the pump allows you to add an external control of some sort? Perhaps choosing your own orifice size, or a proportional valve to control pump response time?

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      • #4
        Absolutely...
        I had a chat with an engineer involved in excavators and talked about CC LS system vs OC systems on excavators. He meant that excavator operators appreciate a slower response when digging in a sensitive ground. Just for a better "feel". Maybe by blocking the bleed off in the compensator will give you the option to implement a fully variable bleed off (0 to X GPM) in another spot of the system...
        He meant that a higher bleed off rate in LS systems could give the operator a similar "feel" with a CC LS system. Other options were "open center" LS Variable flow systems. That's how I recall our discussion which I do not have in hand just now
        BTW have you dived into all the opportunities with the "new" CAN bus controlled Eaton CMA valve? (independent meter in -meter out control)
        http://www.eaton.com/ecm/groups/publ...ct_2853817.pdf
        Click image for larger version  Name:	CMA200 tvärsnitt.jpg Views:	1 Size:	199.3 KB ID:	126
        I know Parker does not have it yet in their program. Does Danfoss or Rexroth?
        Parker does have "Intellinder", a new optical high precision position sensor system in the linear actuators....and it is CAN bus controlled...
        https://www.parker.com/literature/Hy..._HY18-0035.pdf
        ​​​​​ Click image for larger version  Name:	Parker streckkodad kolvstång.jpg Views:	1 Size:	93.2 KB ID:	124
        Komatsu is involved with Parker in the logging machine division and has made their own "cheap solution" of independent meter in-meter out flow control. They use two standard Parker valve sections and use A-port from one valve section, and B-port from the other valve section. With some standard Hall effect cylinder position sensors, they created the SmartFlow system. More info will be available the 1st o September when these machines are introduced to the market Click image for larger version  Name:	Komatsu SmartFlow.jpg Views:	5 Size:	63.7 KB ID:	129

        Sorry the caps on this image is in Swedish, but I am sure you get it... :-)
        Ventil=valve
        Slider=spools

        Last edited by akkamaan; 08-10-2017, 11:48 AM.

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        • #5
          I'm with CAN networks in general, but wasn't aware of Eaton's product offering. I'm pretty sure all the big guys (especially Danfoss) offer this stuff. And yeah, that bar-coded Parker rod is pretty slick1

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          • #6
            I have scanned all major actors in valve manufacturing and I can't find anyone else then Eaton to have this type of valve. Maybe a good topic for Fluid Power World to check out where each manufacturer stands on this....

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            • #7
              Actually, we're in a world between products like CAN and IoT. I suspect many manufacturers will just go right to IoT protocols, skipping CAN connectedness altogether. I wrote a piece of IoT recently, as a matter of fact.

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              • #8
                Originally posted by JoshCosford View Post
                Actually, we're in a world between products like CAN and IoT. I suspect many manufacturers will just go right to IoT protocols, skipping CAN connectedness altogether. I wrote a piece of IoT recently, as a matter of fact.
                akkamaan Josh....
                CAN bus and/or the IoT, Internet of Things, doesn't matter for the hardware design right? ie how hydraulic valve hardware is designed?
                How the electronics and communication protocols are designed isn't that just a matter of how we decide how to control our hydraulic system.....PWM, CAN, or whatever...

                For my question I do not care if it is CAN bus, IoT, wi-fi, Bluetooth or something else....
                I am just wondering if any other manufacturer have a directional valve that use dual spools and independently controls meter-in/meter-out flow control



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