Assertion: air compressor's pressure | /r/CapableOf | build up in sequence
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text: During start-up the compressor first builds up pressure on the first stage, and is unbalanced, with a greater load on that cylinder's piston, and will vibrate more than normal, as there is no equivalent load on the other stage pistons, then pressure in the other stages builds up in sequence, until all cylinders are operating at their working pressures, the loads on all the pistons are similar, and the back-pressure valve starts to open to let the compressed gas flow to the distribution panel.