A constriction in a powder pump that USES compressed air to lift and transport powder from feed system to the spray gun.
在粉末泵中的收缩能够使压缩空气从喂料系统到喷粉枪提升和搬运粉末。
The water flow velocity in the suction pipe, which is crucial for evaluating the performance on pumping fish, can be measured by the pumped water flow rate of the riser in an air lift pump system.
气力提升泵的水输送量反映了提升管进口的流速情况，而进口流速是衡量吸鱼效果的重要因素。
Points out that the cubic law of pump power is not valid for the cooling water system of central air conditioning for it is an open system. The static head should be the lift in a cooling tower.
指出集中空调冷却水系统为开式系统，一般不适用功率三次方定律，静压头应为冷却塔塔体扬程，并提出了冷却水泵变速时轴功率的计算公式；
This pump has air vent holes, the complete lift can not work in year, seals, has long performance life, maintains briefly without machinery.
该泵设有排气孔，全扬程工作不过载、无机械密封、使用寿命长、维护简单。
This pump has air vent holes, the complete lift can not work in year, seals, has long performance life, maintains briefly without machinery.
该泵设有排气孔，全扬程工作不过载、无机械密封、使用寿命长、维护简单。
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