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Thread: Emag valve on ULE body

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  1. #1
    Join Date
    Jan 2002
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    Halifax, N.S., Canada
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    Quote Originally Posted by 1985phenom View Post
    This is a picture of the trigger rod with the emag valve. There is not a credit card gap and I believe this is due to the on/off pin pushing down on the sear and pushing the trigger rod further forward. It does not do this on my classic valve. Is my analysis correct?

    With the little amount of air I had left (1100psi) I tested it again after adding some oil. It is odd that it shoots different when their is paint and when there is no paint. This leads me to believe that It is probably an o-ring issue as several of you have suggested. The reason for this is because I have not changed anything since I have purchased this valve. However the shooting dynamics have greatly changed.
    The trigger rod isn't affected by the on-off pin length except if it can't generate enough force to fully rotate the sear assembly. The sear rotates forward and stops when the knob on the top of the sear, between the sear pin and the sear tip, makes contact with the bottom of the body. When the sear is fully reset, and the trigger is held against the safety (with the safety on), you should have a credit card gap between the back of the trigger and the front of the trigger rod. Both the classic valve and the emag valve should cause the same rotation regardless of pin used.

    The change in residual chamber pressure affects how reactive the valve is. When fired without paint, the chamber completely empties so there is a lot of pressure differential between the incoming tank pressure and zero chamber pressure. When fired with paint, not all of the air pressure leaves the chamber before the bolt resets. Therefore the pressure differential is less between the incoming tank pressure and the remaining chamber pressure. The higher differential pressure for an empty chamber gives a larger volume of incoming air pushing the trigger back with more sustained force which translates into a more reactive trigger.
    Except for the Automag in front, its usually the man behind the equipment that counts.

  2. #2
    Join Date
    Oct 2013
    Location
    South Carolina
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    Quote Originally Posted by athomas View Post
    The trigger rod isn't affected by the on-off pin length except if it can't generate enough force to fully rotate the sear assembly. The sear rotates forward and stops when the knob on the top of the sear, between the sear pin and the sear tip, makes contact with the bottom of the body. When the sear is fully reset, and the trigger is held against the safety (with the safety on), you should have a credit card gap between the back of the trigger and the front of the trigger rod. Both the classic valve and the emag valve should cause the same rotation regardless of pin used.

    The change in residual chamber pressure affects how reactive the valve is. When fired without paint, the chamber completely empties so there is a lot of pressure differential between the incoming tank pressure and zero chamber pressure. When fired with paint, not all of the air pressure leaves the chamber before the bolt resets. Therefore the pressure differential is less between the incoming tank pressure and the remaining chamber pressure. The higher differential pressure for an empty chamber gives a larger volume of incoming air pushing the trigger back with more sustained force which translates into a more reactive trigger.
    So your assesment is to change the on/off o-ring. I will look to change that out later this week and see if that changes anything. Thanks for the help.

  3. #3
    Join Date
    Jan 2002
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    Halifax, N.S., Canada
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    A quick test would be to install the classic on-off assembly into the emag valve and try it. If it works, then you know the emag on-off is the problem and not some other part of the valve.

  4. #4
    Join Date
    Oct 2013
    Location
    South Carolina
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    213
    This was from today. I just put a quad o-ring in and oiled the on/off and power tube. This has the lvl10. Any thoughts to what my problem is??http://ULE automag leak: <a href="ht...Ern0Piixkw</a>

  5. #5
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  6. #6
    Join Date
    Jan 2002
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    Any leak from the on-off that you can hear , is caused by one of the bottom orings, not the top ones. If you hear a leak from the on-off area, it is more likely to be air leaking from the level 10 than air from the on-off.

    From your video, it appears that your issue is more level 10 related than on-off related. I am sure you did this, but make sure your shims are removed from the powertube.

  7. #7
    Join Date
    Oct 2013
    Location
    South Carolina
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    Yes all shims have been removed. I believe that I also have the smallest carrier size.

  8. #8
    Join Date
    Oct 2013
    Location
    South Carolina
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    213
    I put the RT on/off in my classic valve and it RT'd. Is that normal?? I know it is supposed to decrease the trigger pull. I didnt have a crono but i wonder if I had decreased velocity as a result.

    https://www.youtube.com/watch?v=eJlBsJ4o0pY

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