If you've ever taken down a hydraulic cylinder and set up a sealing kit onto your workbench, you've noticed none of the seals look exactly identical. Some are square-cut, others have lips, some U-shaped, and others look as if they could not possibly keep back the flow of fluid. That's intentional. Each seal profile within the hydraulic cylinder is designed to perform a specific task or location and a particular combination of motion and pressure conditions. If you confuse a rod seal and the piston seal when you reassemble them, you'll be returning to your workbench quicker than you'd prefer.
Read more: https://whyps.com/rod-seal-vs-piston-seal-vs-wiper-seal-functions-positions-and-profiles-explained
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