Hendrickson HCV with auto-dump

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Hanadarko, Nov 22, 2012.

  1. Hanadarko

    Hanadarko Independent Owner/Operator

    2,962
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    Oct 1, 2009
    Midwest
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    Anyone familiar with this trailer valve?
    I installed it and it works fine but I am trying to understand how its working.

    It has the following:

    1. RESERVOIR TANK AIR IN
    2. AIR OUT 1
    3. AIR OUT 2 (if not needed its plugged off)
    4. EXHAUST
    5. EMERGENCY AIR IN (signal to dump HCV valve when removed)

    If the suspension bleeds off, it goes out the EXHAUST.

    However, when I set the trailer brakes (pop the red dash valve out)
    it does dump the suspension but air shoots out around the #5 port.
    (it has what appears to be some sleeve)

    I think thats normal but I had expected it would go out EXHAUST.
    I suspect there is a diaphragm in there or something.

    Anyone know? - I'm just curious...
     
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