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3, due to the PTFE and other materials have good self-lubrication, and the ball friction loss is small, so the service life of the pneumatic ball valve is long.

At its core, permanent die casting involves injecting molten metal into a reusable mold or die made of durable materials such as steel or iron. This contrasts with other casting methods, such as sand casting, where the mold is typically destroyed after a single use. The ability to reuse the mold significantly reduces costs over time, especially for large production runs, making permanent die casting a cost-effective solution for manufacturers.