螺杆泵的压力是由吸入腔内的压力经过各级密封腔增大到排出腔压力，是逐渐建立的。压力建立慢，除了有低脉动的优点外，声压级也很低，并具有保证输送介质完好，不会快速老化的优点。在理论上螺杆泵是无脉动的，因为每个旋转角排出相同体积的流量。实际上由于加工的误差和存在间隙以及工作长度不是密封腔的整倍数等原因，还是会存在一些脉动。但其排出压力的脉动远远小于其他类型泵。压力脉动会引起整个装置的振动，是噪声增大的一个很重要的原因。因此，压力脉动小这一重要特性，也使它优于很多类型泵，因而在液压等系统中得到优先采用。螺杆泵由于没有阀、脉动小等原因，其水力损失小，因此它通常和机械摩擦损失合在一起，不单独计算。
SMH卧式三螺杆泵型号(SMH卧式安装、SMS立式安装、SMF法兰式安装、SME插装式安装)(R为右旋，L为左旋)
SMH40R38E6.7W23 SMH40R38U8W23 SMH40R38U12.1W23
SMH40R46E6.7W23 SMH40R46U8W23 SMH40R46U12.1W23
SMH40R54E6.7W23 SMH40R54U8W23 SMH40R54U12.1W23
SMH80R36E6.7W23 SMH80R36U8W23 SMH80R36U12.1W23
SMH80R42E6.7W23 SMH80R42U8W23 SMH80R42U12.1W23
SMH80R46E6.7W23 SMH80R46U8W23 SMH80R46U12.1W23
SMH80R54E6.7W23 SMH80R54U8W23 SMH80R54U12.1W23
SMH120R42E6.7W23 SMH120R42U8W23 SMH120R42U12.1W23
SMH120R46E6.7W23 SMH120R46U8W23 SMH120R46U12.1W23
SMH120R54E6.7W23 SMH120R54U8W23 SMH120R54U12.1W23
SMH210R40E6.7W23 SMH210R40U8W23 SMH210R40U12.1W23
SMH210R46E6.7W23 SMH210R46U8W23 SMH210R46U12.1W23
SMH210R54E6.7W23 SMH210R54U8W23 SMH210R54U12.1W23
SMH280R43E6.7W23 SMH280R43U8W23 SMH280R43U12.1W23
SMH280R46E6.7W23 SMH280R46U8W23 SMH280R46U12.1W23
SMH280R54E6.7W23 SMH280R54U8W23 SMH280R54U12.1W23
SMH440R40E6.7W23 SMH440R40U8W23 SMH440R40U12.1W23
SMH440R42E6.7W23 SMH440R42U8W23 SMH440R42U12.1W23
SMH440R46E6.7W23 SMH440R46U8W23 SMH440R46U12.1W23
SMH440R54E6.7W23 SMH440R54U8W23 SMH440R54U12.1W23
SMH660R40E6.7W23 SMH660R40U8W23 SMH660R40U12.1W23
SMH660R44E6.7W23 SMH660R44U8W23 SMH660R44U12.1W23
SMH660R46E6.7W23 SMH660R46U8W23 SMH660R46U12.1W23
SMH660R51E6.7W23 SMH660R51U8W23 SMH660R51U12.1W23
SMH660R54E6.7W23 SMH660R54U8W23 SMH660R54U12.1W23
SMH940R42E6.7W23 SMH940R42U8W23 SMH940R42U12.1W23
SMH940R46E6.7W23 SMH940R46U8W23 SMH940R46U12.1W23
SMH940R50E6.7W23 SMH940R50U8W23 SMH940R50U12.1W23
SMH940R54E6.7W23 SMH940R54U8W23 SMH940R54U12.1W23
SMH1300R38E6.7W23 SMH1300R38U8W23 SMH1300R38U12.1W23
SMH1300R42E6.7W23 SMH1300R42U8W23 SMH1300R42U12.1W23
SMH1300R46E6.7W23 SMH1300R46U8W23 SMH1300R46U12.1W23
SMH1300R54E6.7W23 SMH1300R54U8W23 SMH1300R54U12.1W23
SMH1700R42E6.7W23 SMH1700R42U8W23 SMH1700R42E6.7W23
SMH1700R46E6.7W23 SMH1700R46U8W23 SMH1700R46E6.7W23
SMH2200R42E6.7W23 SMH2200R42U8W23 SMH2200R42E6.7W23
SMH2200R46E6.7W23 SMH2200R46U8W23 SMH2200R46E6.7W23
SMH2900R40E6.7W23 SMH2900R40U8W23 SMH2900R40E6.7W23
SMH2900R46E6.7W23 SMH2900R46U8W23 SMH2900R46E6.7W23
SMH3600R46E6.7W23 SMH3600R46U8W23 SMH3600R46E6.7W23
SMH5300R46E6.7W23 SMH5300R46U8W23 SMH5300R46E6.7W23
材质W21锡青铜衬套系列
SMH40R38E6.7W21 SMH40R38U8W21 SMH40R38U12.1W21
SMH40R46E6.7W21 SMH40R46U8W21 SMH40R46U12.1W21
SMH40R54E6.7W21 SMH40R54U8W21 SMH40R54U12.1W21
SMH80R36E6.7W21 SMH80R36U8W21 SMH80R36U12.1W21
SMH80R42E6.7W21 SMH80R42U8W21 SMH80R42U12.1W21
SMH80R46E6.7W21 SMH80R46U8W21 SMH80R46U12.1W21
SMH80R54E6.7W21 SMH80R54U8W21 SMH80R54U12.1W21
SMH120R42E6.7W21 SMH120R42U8W21 SMH120R42U12.1W21
SMH120R46E6.7W21 SMH120R46U8W21 SMH120R46U12.1W21
SMH120R54E6.7W21 SMH120R54U8W21 SMH120R54U12.1W21
SMH210R40E6.7W21 SMH210R40U8W21 SMH210R40U12.1W21
SMH210R46E6.7W21 SMH210R46U8W21 SMH210R46U12.1W21
SMH210R54E6.7W21 SMH210R54U8W21 SMH210R54U12.1W21
SMH280R43E6.7W21 SMH280R43U8W21 SMH280R43U12.1W21
SMH280R46E6.7W21 SMH280R46U8W21 SMH280R46U12.1W21
SMH280R54E6.7W21 SMH280R54U8W21 SMH280R54U12.1W21
SMH440R40E6.7W21 SMH440R40U8W21 SMH440R40U12.1W21
SMH440R42E6.7W21 SMH440R42U8W21 SMH440R42U12.1W21
SMH440R46E6.7W21 SMH440R46U8W21 SMH440R46U12.1W21
SMH440R54E6.7W21 SMH440R54U8W21 SMH440R54U12.1W21
SMH660R40E6.7W21 SMH660R40U8W21 SMH660R40U12.1W21
SMH660R44E6.7W21 SMH660R44U8W21 SMH660R44U12.1W21
SMH660R46E6.7W21 SMH660R46U8W21 SMH660R46U12.1W21
SMH660R51E6.7W21 SMH660R51U8W21 SMH660R51U12.1W21
SMH660R54E6.7W21 SMH660R54U8W21 SMH660R54U12.1W21
SMH940R42E6.7W21 SMH940R42U8W21 SMH940R42U12.1W21
SMH940R46E6.7W21 SMH940R46U8W21 SMH940R46U12.1W21
SMH940R50E6.7W21 SMH940R50U8W21 SMH940R50U12.1W21
SMH940R54E6.7W21 SMH940R54U8W21 SMH940R54U12.1W21
SMH1300R38E6.7W21 SMH1300R38U8W21 SMH1300R38U12.1W21
SMH1300R42E6.7W21 SMH1300R42U8W21 SMH1300R42U12.1W21
SMH1300R46E6.7W21 SMH1300R46U8W21 SMH1300R46U12.1W21
SMH1300R54E6.7W21 SMH1300R54U8W21 SMH1300R54U12.1W21
SMH1700R42E6.7W21 SMH1700R42U8W21 SMH1700R42E6.7W21
SMH1700R46E6.7W21 SMH1700R46U8W21 SMH1700R46E6.7W21
SMH2200R42E6.7W21 SMH2200R42U8W21 SMH2200R42E6.7W21
SMH2200R46E6.7W21 SMH2200R46U8W21 SMH2200R46E6.7W21
SMH2900R40E6.7W21 SMH2900R40U8W21 SMH2900R40E6.7W21
SMH2900R46E6.7W21 SMH2900R46U8W21 SMH2900R46E6.7W21
SMH3600R46E6.7W21 SMH3600R46U8W21 SMH3600R46E6.7W21
SMH5300R46E6.7W21 SMH5300R46U8W21 SMH5300R46E6.7W21
材质W2球墨铸铁衬套系列
SMH40R38E6.7W2 SMH40R38U8W2 SMH40R38U12.1W2
SMH40R46E6.7W2 SMH40R46U8W2 SMH40R46U12.1W2
SMH40R54E6.7W2 SMH40R54U8W2 SMH40R54U12.1W2
SMH80R36E6.7W2 SMH80R36U8W2 SMH80R36U12.1W2
SMH80R42E6.7W2 SMH80R42U8W2 SMH80R42U12.1W2
SMH80R46E6.7W2 SMH80R46U8W2 SMH80R46U12.1W2
SMH80R54E6.7W2 SMH80R54U8W2 SMH80R54U12.1W2
SMH120R42E6.7W2 SMH120R42U8W2 SMH120R42U12.1W2
SMH120R46E6.7W2 SMH120R46U8W2 SMH120R46U12.1W2
SMH120R54E6.7W2 SMH120R54U8W2 SMH120R54U12.1W2
SMH210R40E6.7W2 SMH210R40U8W2 SMH210R40U12.1W2
SMH210R46E6.7W2 SMH210R46U8W2 SMH210R46U12.1W2
SMH210R54E6.7W2 SMH210R54U8W2 SMH210R54U12.1W2
SMH280R43E6.7W2 SMH280R43U8W2 SMH280R43U12.1W2
SMH280R46E6.7W2 SMH280R46U8W2 SMH280R46U12.1W2
SMH280R54E6.7W2 SMH280R54U8W2 SMH280R54U12.1W2
SMH440R40E6.7W2 SMH440R40U8W2 SMH440R40U12.1W2
SMH440R42E6.7W2 SMH440R42U8W2 SMH440R42U12.1W2
SMH440R46E6.7W2 SMH440R46U8W2 SMH440R46U12.1W2
SMH440R54E6.7W2 SMH440R54U8W2 SMH440R54U12.1W2
SMH660R40E6.7W2 SMH660R40U8W2 SMH660R40U12.1W2
SMH660R44E6.7W2 SMH660R44U8W2 SMH660R44U12.1W2
SMH660R46E6.7W2 SMH660R46U8W2 SMH660R46U12.1W2
SMH660R51E6.7W2 SMH660R51U8W2 SMH660R51U12.1W2
SMH660R54E6.7W2 SMH660R54U8W2 SMH660R54U12.1W2
SMH940R42E6.7W2 SMH940R42U8W2 SMH940R42U12.1W2
SMH940R46E6.7W2 SMH940R46U8W2 SMH940R46U12.1W2
SMH940R50E6.7W2 SMH940R50U8W2 SMH940R50U12.1W2
SMH940R54E6.7W2 SMH940R54U8W2 SMH940R54U12.1W2
SMH1300R38E6.7W2 SMH1300R38U8W2 SMH1300R38U12.1W2
SMH1300R42E6.7W2 SMH1300R42U8W2 SMH1300R42U12.1W2
SMH1300R46E6.7W2 SMH1300R46U8W2 SMH1300R46U12.1W2
SMH1300R54E6.7W2 SMH1300R54U8W2 SMH1300R54U12.1W2
SMH1700R42E6.7W2 SMH1700R42U8W2 SMH1700R42E6.7W2
SMH1700R46E6.7W2 SMH1700R46U8W2 SMH1700R46E6.7W2
SMH2200R42E6.7W2 SMH2200R42U8W2 SMH2200R42E6.7W2
SMH2200R46E6.7W2 SMH2200R46U8W2 SMH2200R46E6.7W2
SMH2900R40E6.7W2 SMH2900R40U8W2 SMH2900R40E6.7W2
SMH2900R46E6.7W2 SMH2900R46U8W2 SMH2900R46E6.7W2
SMH3600R46E6.7W2 SMH3600R46U8W2 SMH3600R46E6.7W2
SMH5300R46E6.7W2 SMH5300R46U8W2 SMH5300R46E6.7W2