本文计算、分析、确定了限压式变量系和差压式变量泵输出功率最大值和节能效率最大值的压力点；

This paper calculates, analyses and determines the pressure point of maximum of ouput power and saving-energy efficiency of differential pressure and Limited pressure variable displacement pump.

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设置合适的操作压力看似容易，但却经常被大家所忽视，喷涂操作员可简单的将泵压调至最大之后喷涂。

Settingthe proper pressure seems so easy, but it is so often ignored. An applica-torcan simply turn the pump to the maxi-mum pressure and spray.

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文章分析了影响提高罗茨真空泵最大允许压差因素，提出了解决方法。

In this article, the factors that affect the max. permissible differential pressure of Roots vacuum pump are discussed. The methods of increasing it are discussed together.

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