Ball valve fully open, the flow resistance is very small, almost zero, so the ball valve diameter is widely used in petroleum and natural gas pipelines because the pipeline cleaning easy.
球阀在完全开启时，流阻很小，几乎等于零，因此等径球阀广泛应用于石油天然气管线中，因为容易清扫管线。
This resistance is normally very small, ranging from micro-ohms to a few ohms.
接触电阻一般非常小其范围在微欧姆到几个欧姆之间。
Together, under various environmental conditions can also insist on the function of policy, that plank of wicked weather resistance, temperature influence is very small.
一同，在各种环境条件下也能坚持各项功用政策的安稳，说明板材有超卓的耐候性，受温度影响很小。
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