| 摘要 |
An improved replaceable valve shaft sealing system is disclosed that enables the operator to greatly reduce the maintenance needs of valves where rotational movement of a shaft, that is connected to the actual metering apparatus of the valve, actuates the opening or closing of the valve thereby regulating fluid flow. Such valves are subjected to differentiations in pressure, including the suction that occurs during pressure drops, temperature, which directly effects the valve body material and tolerances through thermal expansion, degradation of the sealing members due to presence of chemicals and absence of lubrication and wear due to the constant adjustment of the valve due to environmental variables, Current designs use O-rings to prevent the seepage of fluid into the valve body and though the rotating shaft, but current designs do little to prevent contamination of the lubrication into the fluid flow nor eliminate any of the axial loads that can cause O-rings to fail. Current designs are also not designed to be replaceable in the field with simple removal of the stem without removing the valve from the piping system.
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