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Bendix AD-9 soft vs hard seat purge valve

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by NebraskaGMC, Jan 8, 2025.

  1. Jan 8, 2025 #1
    NebraskaGMC

    NebraskaGMC Bobtail Member

    37
    13
    Jun 9, 2019
    0
    Just put a reman AD-9 on my truck with an N14 C+ (I bet you can guess where this is going) with a QE style compressor. This compressor needs a 4 port dryer, so I had to drill and tap a new port for the "Econ Valve." Trouble is, this reman dryer has a hard seat purge valve, and this setup needs a soft seat, which I was unaware of at the time of purchase. Do the hard and soft seat valves use the same housing? I'd rather not pay $300 for a whole new purge valve since that's more than the whole dryer cost, and instead just rebuild the valve with a soft seat kit
     
    NebraskaGMC, Jan 8, 2025
    NebraskaGMC, Jan 8, 2025
    #1
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  3. Jan 8, 2025 #2
    dberset

    dberset Light Load Member

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    Jan 12, 2020
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    dberset, Jan 8, 2025
    dberset, Jan 8, 2025
    #2
    Rideandrepair and NebraskaGMC Thank this.
  4. Jan 8, 2025 #3
    NebraskaGMC

    NebraskaGMC Bobtail Member

    37
    13
    Jun 9, 2019
    0
    Yes I'm aware the entire assembly can be substituted, which is what I'm trying to avoid. I'm asking whether the rebuild kit with a soft seat plunger will fit in the housing that had a hard seat.
     
    NebraskaGMC, Jan 8, 2025
    NebraskaGMC, Jan 8, 2025
    #3
  5. Jan 9, 2025 #4
    arthurjohnston

    arthurjohnston Bobtail Member

    7
    0
    Dec 17, 2024
    Black Eagle
    0
    Curious to hear how others manage maintenance on these – do you stick to OEM parts or go for aftermarket replacements? Also, any tips on extending the life of the purge valve would be awesome to hear!
     
    arthurjohnston, Jan 9, 2025
    arthurjohnston, Jan 9, 2025
    #4
  7. Jan 9, 2025 #5
    dberset

    dberset Light Load Member

    74
    34
    Jan 12, 2020
    0
    In the great white north of Wisconsin we replace the entire dryer if there is any problem. Calcium chloride, beet and pickle brine a liquid road salt don’t play well with aluminum and steel or copper.
    Ok. I understand. I’m sorry I can’t answer that.
     
    dberset, Jan 9, 2025
    dberset, Jan 9, 2025
    #5
    arthurjohnston Thanks this.
  8. Sep 9, 2025 #6
    stat.will

    stat.will Bobtail Member

    4
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    Jun 10, 2014
    0
    stat.will, Sep 9, 2025
    stat.will, Sep 9, 2025
    #6
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