Cartridge type air and oil seals-seal air is injected into the oil seal and is vented to atmosphere between the seals.
套筒式气封和油封总成，油封之间通密封空气， 油封与气封之间有一通大气的腔室。
Cartridge type air and oil seals-seal air is injected into the oil seal and is vented to atmosphere between the seals.
套筒式气封和油封总成，油封之间通密封空气， 油封与气封之间有一通大气的腔室。
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