使用寿命长，阻力低。
Shuttle valves for low pressure drop.
低压阀门下降班车。
The correlation of laying off is obtained in the low pressure drop region by experiment.
实验得出了低压差工作区下料速度关联式。
Large air flow, less pressure drop and low-noise, good blind mobility and reliability.
风量大、噪声低、压头损失少、百叶灵活可靠等。
Large air flow, less pressure drop and low-noise, good blind mobility and reliability.
风量大、噪声低、压头损失少、百叶灵活可靠等。
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