泵是一种能量转换的机器，它把原动机的机械能或某种流体的能量传递给输送的液体，使其能量增加。就泵的历史而言，它是一种非常古老的机械。在古代它只是一种改变液体位能的提水工具，人们习惯把泵称之为水泵，并把它归入水力机械。随着科学技术的发展，泵的种类也在不断增多，各种类型的泵在国民经济的各个领域得到了广泛的应用，输送的介质也早已超出了水的范畴。
螺杆泵就是这样一种新兴的泵。螺杆泵按其作用原理属于容积式泵的类型，若按它对液体能量传递的方式，则属于转子泵，故可称之为容积式转子泵。如今，螺杆泵虽然仍有用来提水的，但更多的是用于工业领域，人们通常把它归纳为工业泵的范畴。
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
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