1. Put a piece of ා 600 sandpaper in ATF oil and soak for about 30 minutes. Carefully tap the valve body to remove the stuck stem from the bore. It may be necessary to lever it out with a small screwdriver.
2.使用螺丝刀时，小心不要刮伤阀孔。检查单向阀杆上是否有摩擦痕迹。用浸有ATF油的#600砂纸打磨气门杆上的毛刺，然后用溶剂清洗气门杆并用压缩空气吹干。
2. When using the screw driver, be careful not to scratch the valve hole. Check for friction marks on the one-way stem. Grind the burrs on the valve stem with ා 600 sandpaper soaked in ATF oil, then clean the valve stem with solvent and dry it with compressed air.
3.卷起浸透ATF油的#600砂纸的一半，并将其插入卡住的气门杆的气门孔中。轻轻拧松砂纸并将其紧紧地贴在阀孔表面上，然后边推边拉边拧砂纸研磨阀孔。拔出600砂纸。
3. Roll up half of the ා 600 sandpaper soaked in ATF oil and insert it into the valve hole of the stuck valve stem. Gently loosen the sandpaper and stick it tightly on the surface of the valve hole, and then screw the sandpaper to grind the valve hole while pushing and pulling. Pull out 600 sandpaper.
4.用溶剂清洗整个阀体，然后用压缩空气吹干。在气门杆表面涂抹ATF油并将其滴入气门孔。阀杆应能以自身重量落入阀孔底部。否则，重复步骤4并重新测试。如果阀杆仍然卡住，则更换阀体。
4. Clean the whole valve body with solvent and then dry it with compressed air. Coat the surface of the valve stem with ATF oil and drip it into the valve bore. The valve stem shall be able to fall into the bottom of the valve bore with its own weight. Otherwise, repeat step 4 and retest. If the stem is still stuck, replace the valve body.
5.取出小型混凝土搅拌机的阀杆，用溶剂清洗阀杆和阀体。用压缩空气吹干所有零件，然后用ATF油作为润滑剂重新装配。
5. Take out the valve rod of small concrete mixer and clean the valve stem and valve body with solvent. Dry all parts with compressed air and reassemble with ATF oil as lubricant.
6.建议对混凝土储罐及进出口周围进行清洗，确保混凝土不结块。
6. It is suggested to clean the concrete storage tank and the surrounding of the inlet and outlet to ensure that the concrete does not agglomerate.
