安装止回阀必须使其阀门流向箭头与流体流向相一致。
Check valves MUST be installed with the valves flow arrow pointing in the direction of the flow.
交叉肋通道壁面温度沿流体流向的梯度要比平行肋通道的小。
The stream wise wall temperature gradient for the crossed rib one is lower than that for the parallel rib one.
蝶阀在开启时蝶板与流体流向平行，流阻小，流通截面大，阀芯不易被冲刷；
When opening the valve, the valve disc is parallel with the flow direction. The flow resistance is little, the flow section is large and the core will not be eroded.
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