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Repairing Cartridge Valve stem / cup seal

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    Repairing Cartridge Valve stem / cup seal

    Before I post a WTB for a new cart valve stem / cup seal / piercer (what exactly IS that part called?) I thought I'd ask here:

    is it possible to replace or repair the seal itself, rather than swapping out the whole part?

    At the moment, for the price I'll probably pay for a new part, it's not really worth my time. But I don't think these parts will get easier to find with time (though Palmers might make them still as long as they are open).


    #2
    I accidently melted one out when I was attempting to solder a loose "pressed-in" pierce rod back into the stem. I cut a piece of EPDM sheet and glued it in. It worked for awhile.

    The valve stems are cheap enough and plentiful that its just easier to buy a new one and toss the old ones in a pile.

    Comment


    • JonM

      JonM

      commented
      Editing a comment
      If you get one from PPS, hopefully you get one that’s in spec.

    #3
    Yes, they are still made by Crosman
    Dulce et decorum est pro comoedia mori

    Comment


    • Rusty Brass

      Rusty Brass

      commented
      Editing a comment
      I was thinking that the Crosman valve stems worked but wasn't sure.

    #4
    Originally posted by netsurferdude2 View Post
    I accidently melted one out when I was attempting to solder a loose "pressed-in" pierce rod back into the stem. I cut a piece of EPDM sheet and glued it in. It worked for awhile.

    The valve stems are cheap enough and plentiful that its just easier to buy a new one and toss the old ones in a pile.
    Sage advice!

    Comment


      #5
      I have used o-ring glued in there with great results
      I wrote a how to in the sheridan section a while back
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      • apamburn
        apamburn commented
        Editing a comment
        This is what I had in mind, but wasn't sure if it would work. What o ring size did you use, and what did you use to glue it in place?

        Did you remove the existing seal and replace it with the o ring? Or did the o ring go over the existing seal?

      • XEMON

        XEMON

        commented
        Editing a comment
        I removed the old seal, melted/burnt the old one.
        The o-ring that fit is metric (I dont remembrer the exact size, i need to find it in my notes).
        I then used cyanoacrylate (super glue) to glue it in place

        Ive had this with a 3D printed 12g seal in a PGP for about a year and a half ...

      • apamburn
        apamburn commented
        Editing a comment
        Cool! I have a metric kit if you remember. I can use trial and error too of course. I might give this a whirl: not like I have anything to lose.
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