Decreasing the piston diameter of the pump can improve the stability.
减小油泵柱塞直径对稳定性有好处；
The crown diameter of eutectic al Si alloy piston has increased suddenly in twice, but the hyper eutectic al Si alloy piston only once.
共晶铝硅合金活塞顶部直径有两次突然长大，而过共晶铝合金活塞仅有一次。
The capacity and pressure rating can be varied easily by changing the diameter of the piston and cylinder lines.
改变活塞和缸体的直径可改变泵的压力和排量范围。
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