The basket and pan types cause an increased resistance to flow.

吊篮和平盘式取样器加大了对水流的阻力.

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Resistance to flow may be high enough to cause microvoids and porosity.

流动阻力可能太高,从而导致微孔和多孔.

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They offer low resistance to flow and are particularly suited to low velocity service.

这些止回阀对流体的阻流性很低,特别适用于低速流量的应用场合.

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All have straight - through ports to assure minimum turbulence, erosion, and resistance to flow.

所有流道都是直线通过流道,确保湍流 、 侵蚀和流动阻力降到最小程度.

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