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steamer....I do acknowledge that the single L stepped cut seal profile you show is an excellent choice...having a few advantages1. it does not require a piston of demountable construction to install within a fixed piston seal cavity2. it also will compensate for linear, axial & volumetric expansionRaw PTFE is a difficult material to CNC machine.........with your compound step cut I assume the material is reinforced??........Derek
That looks good What sort of speed was it running under load?