The pump features a variable discharge port design which adjusts automatically to the internal compression ratio of the vacuum pump resulting in maximum efficiency throughout the vacuum range.
我们公司生产的液环真空泵，具有不同的出料口，自动调节内部压缩率，已达到最大的真空效率。
2
The weight of the loco is 90 tonnes and maximum speed is 120 km. h, and dual vacuum and air brakes are provided.
机车重量为90吨，最大时速为120公里；小时，并装有真空和空气双重制动器。
3
The vacuum increases quickly in the earlier stage of the drainage, reaches a maximum and gradually becomes zero.