The faucet flushing packing system reduces the effective pressure difference by providing pressurized lubricant to the low-pressure side of the seal, thereby extending the service life of the seal. The pressure of high-pressure lubricating oil is predetermined based on the proportion of mud. This value is between the mud pressure and atmospheric pressure. Usually, each sealing ring bears the same pressure difference. The pressure of lubricating oil is generally lower than the mud pressure to prevent leakage due to excessive lubricating oil pressure
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