How is a static seal achieved for the main packing when the reciprocating machine stops?

2026-01-21View Original

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Recently, I studied the structure and principle of the main packing (pressure packing) in reciprocating machines, and learned that this main packing only functions when the cylinder is in operation; when the machine runs for long periods at zero load, the individual components of the main packing gradually fail, resulting in an increase in leakage. But what ensures sealing after the machine is shut down? A beginner with little experience in equipment has some doubts; looking at the design drawings of the main packing, no elements that could enable a static seal seem to be present

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How is a static seal achieved for the main packing when the reciprocating machine stops?

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