Reciprocating compressor piston ring arrangement
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Explain why there are 2 piston rings on the rod side and only 1 piston ring on the cover side – what is the principle behind this? Is it to compensate for filler leakage?
In fact, all 3 rings serve as gas seals simultaneously; it’s not just the one at the front that does the job! !
Why one on one side and two on the other?
The pressure difference on both sides of the piston ring is relatively small; either of the two options can meet the requirements, let alone all three
It is also said that it is related to the pressure difference at both ends of the piston, and the support rings (three relatively wide ones) also serve to throttle and reduce pressure