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On my mixing machines the oil cooled seals generally use TWO seals placed

seal < oil > seal

With the advantage being the machine can be run dry with OUT causing thermal shock and cracking the seal faces when the material is poured into the mixer BUT they do wear out and fail even the 7000 dollar German CHETRA ones :eek:

I have a guy at place called Gaddis Engineering Co. in Locust Valley, NY that makes me new faces in ANY material carbide ect when a big dollar one fails
 
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