I am designing a linear actuator. I would like a dynamic seal between the piston and the bore (IP66), but the piston will have some torque on it as it slides, so a cylindrical design won't necessarily stop it from rotating. Putting a flat on the piston would stop it from rotating, but I'm not sure how to design the seal groove then, or what seal to use. Does anyone have experience with non-cylindrical dynamic seals?
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