Guider (upper), also known as the upper guider, is used for centering and positioning the discharge valve body assembly, which is made of 20 CrMnTi, treated through carburizing and quenching, the HRC is more than 60.

Guider (lower) is installed in the inner chamber of the hydraulic cylinder, for centering and positioning the suction valve body assembly. The guider consists of the guide way and the inner sleeve embedded in the guide way. The guide way is made of ZG 35 CrMo and the inner sleeve is treated by 20CrMnTi carburization and quenching.