Hard Polished Hydraulic Piston Rod notch clearance: mainly used to compensate for packing ring wear.
Piston rod axial clearance: it is mainly used to ensure that the packing ring can float freely, otherwise the piston rod cannot work normally.
Radial clearance of the piston rod: avoid the packing ring from being compressed due to the sinking of the piston rod, so as not to deform or damage it.
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