泵运行时介质从泵内的排出腔通过密封腔内的间隙漏回到吸入腔的泄漏量，通过螺旋型面之间的间隙的泄漏量要远大于通过螺杆衬套内孔和螺旋面外圆之间间隙的泄漏量。螺旋型面之间的啮合间隙是依据产品的排出压力和输送介质粘度来确定，通常排出压力越高和输送介质的粘度越小，要求该间隙也越小。在制作加工螺旋型面的成型铣刀时必须考虑该间隙值。对于高压三螺杆泵，该间隙尤应严格控制，这样才能达到较高的容积效率。
HSA螺杆泵型号三：
HSA20R38U4PY HSAF20R38U4PY HSAD20R38U4PY HSAFK20R38U4PY HSAS20R38U4PY
HSA20R46U4PY HSAF20R46U4PY HSAD20R46U4PY HSAFK20R46U4PY HSAS20R46U4PY
HSA40R38U4PY HSAF40R38U4PY HSAD40R38U4PY HSAFK40R38U4PY HSAS40R38U4PY
HSA40R46U4PY HSAF40R46U4PY HSAD40R46U4PY HSAFK40R46U4PY HSAS40R46U4PY
HSA80R36U4PY HSAF80R36U4PY HSAD80R36U4PY HSAFK80R36U4PY HSAS80R36U4PY
HSA80R46U4PY HSAF80R46U4PY HSAD80R46U4PY HSAFK80R46U4PY HSAS80R46U4PY
HSA120R42U4PY HSAF120R42U4PY HSAD120R42U4PY HSAFK120R42U4PY HSAS120R42U4PY
HSA120R46U4PY HSAF120R46U4PY HSAD120R46U4PY HSAFK120R46U4PY HSAS120R46U4PY
HSA210R36U4PY HSAF210R36U4PY HSAD210R36U4PY HSAFK210R36U4PY HSAS210R36U4PY
HSA210R40U4PY HSAF210R40U4PY HSAD210R40U4PY HSAFK210R40U4PY HSAS210R40U4PY
HSA210R46U4PY HSAF210R46U4PY HSAD210R46U4PY HSAFK210R46U4PY HSAS210R46U4PY
HSA280R43U4PY HSAF280R43U4PY HSAD280R43U4PY HSAFK280R43U4PY HSAS280R43U4PY
HSA280R46U4PY HSAF280R46U4PY HSAD280R46U4PY HSAFK280R46U4PY HSAS280R46U4PY
HSA440R36U4PY HSAF440R36U4PY HSAD440R36U4PY HSAFK440R36U4PY HSAS440R36U4PY
HSA440R40U4PY HSAF440R40U4PY HSAD440R40U4PY HSAFK440R40U4PY HSAS440R40U4PY
HSA440R46U4PY HSAF440R46U4PY HSAD440R46U4PY HSAFK440R46U4PY HSAS440R46U4PY
HSA660R40U4PY HSAF660R40U4PY HSAD660R40U4PY HSAFK660R40U4PY HSAS660R40U4PY
HSA660R44U4PY HSAF660R44U4PY HSAD660R44U4PY HSAFK660R44U4PY HSAS660R44U4PY
