Did you know valve stem seals are installed in every modern car or truck on the road today? Although these seals are inconspicuous, they are a highly engineered component of an internal combustion engines’ valvetrain. The valve stem seal consists of an elastomer often over-molded to a metal insert with a self-tensioning spring. When installed in an engine, a valve stem seal precisely controls valve lubrication and oil consumption and prevents oil from the cylinder head from entering the combustion chamber. Valve stem seals are typically produced of material that has excellent oil and heat resistance, such as FKM or fluoroelastomer.

In this example, DESMA designed, engineered, and delivered a fully automated production cell using a vertical 968,250 ZO Benchmark machine, a DESMA temperature-controlled ITM pot, and dual injection tooling packages consisting of 48 cavities each. Using DESMA sliding devices, the injection machine manipulates one tool for cavity filling and vulcanizing while the other tool is positioned outside for automated demolding via robotics. Insert loading is also automated. The DESMA molding system provides optimal productivity for our customers with limited operator interaction.

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