缸块平衡块的活塞套壁薄，几何尺寸精度要求高，粗糙度要求严格，其质量好坏直接决定平衡块的寿命。
Hydraulic valve block balance weight piston sleeve has thin wall, high precision of geometry dimension and strict roughness, and its quality determines the lifetime of balance weight directly.
白斑是离心铸造厚壁铸铁缸套的一种异常组织。
The white spot defect is an abnormal structure generally found in large cast iron cylinder sleeve by centrifugal casting.
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