The bodyscrew back into place, gently open the little front-end ball valve, using compressed air to the drainage system of impurities, water, oil draining;
将阀体拧回原位，前端球阀轻轻打开一点，用压缩空气将排水系统内的杂质、水油排空；
2
Screw pump body and tightly.
螺杆与泵体紧密贴合。
3
Therefore, the pump body and screw cylindrical surface and screw and screw clearance should be as small as possible.