Air leaks in the solenoids under each unit

Discussion in '4-Color Offset Presses +' started by RG7216, Nov 17, 2022.

  1. RG7216

    RG7216 Member

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    We are experiencing leaks in each of the units on our Heidelberg 1992 SM102. They seem to be coming from the solenoids part number 61.184.1051. Not sure what to do... Any help is appreciated.
     
  2. junker1984

    junker1984 Senior Member

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    Typically, the cause of this “blow-by” is worn seals in the pneumatic rams. For example, the rams which throw the Alcolor train on/off, or the ram that controls on/off of the ductor…any of these with worn seals will cause this. Use a pliers to pinch off air line going to the pneumatic component, and you will likely stop the air flow “blow-by”.
     
  3. RG7216

    RG7216 Member

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    Great, Thanks for the info. We will look at that. Much appreciated.
     
  4. junker1984

    junker1984 Senior Member

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    You should also be sure that your air pressure regulator is set to no higher than 7 bar (98psi). Higher pressures will cause premature failure of pneumatics.
     
  5. Adil

    Adil Senior Member

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    Hi sir
    Did you solve the problem ??
    Be sure of the origine of the issue is it the solenoid valve or the exhaust, is it general or in some solenoid valve, if you have a photo of the pneumatic distribution blocks that will be better and a video of problem that will be a plus
     
  6. RG7216

    RG7216 Member

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    Thanks Junker 1984.. We checked the regulator and it seems to be working. Still getting the blow-by. Not sure if the valves are just worn or what.. We swapped out a couple and still had the same leaking out of the back.

    Adil, I've attached a pic of the valve bank. The leak is only on certain valves. Not all of them.
     

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  7. junker1984

    junker1984 Senior Member

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    OK, Oregon…depress, one at a time, the red button. This should pinpoint which of the directional control valves is culprit. Keep in mind, given the circumstance, it’s likely not the directional valve that’s faulty, it would be the pneumatic ram(s) it controls, ie…the Alcolor ram(s), the ductor on/off ram, blanket washer ram(s), etc…
     
  8. RG7216

    RG7216 Member

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    Junker, I depressed the red button on the ones that are leaking and got the same leak out of the exhaust. A little bit weaker air but still leaking.
     
  9. junker1984

    junker1984 Senior Member

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    Since you noticed a change, it’s likely that the problem lies in one of the assemblies that utilizes two rams to accomplish action. That would be the Alcolor or blanket wash systems, which use a ram on each side of press. Did you pinch off the line to/from the directional control valve with a (softened …as in rag lined) pliers?
     
  10. junker1984

    junker1984 Senior Member

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    You do understand the air lines to the dual operated rams are split off on their way to the rams. If, for instance, the Alcolor rams (one or the other) is causing the blowby, pinching the line first at one, then the other, will indicate which one requires replacing. I’m going on the assumption that the leak is caused by the rams, not the directional control valve.
     
  11. RG7216

    RG7216 Member

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    I think I understand what you are saying. I will speak with the operator and try your suggestion out. Thank you very much for all the suggestions and help. Rob
     
  12. junker1984

    junker1984 Senior Member

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    You're welcome, Rob. Invoice is in the mailbox.
     

  13. Adil

    Adil Senior Member

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    Hi sir
    when you have activated the solenoid valves manually do the cylinders react in the printing unit???
    if the leak is at the level of the exhaust, it means that either there is a blockage at the level of the corresponding cylinder or there is a problem in the internal drawer of the distributor and that it must be replaced.
    also check if you have water in the compressed air lines in this case you must replace the distributors and install a compressed air dryer
    Good luck
     
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