phillips screw

1. Remove Phillips head screw.
   拆卸十字槽螺丝帽。
2. Insert and tighten Phillips head screw.
   插入并且旋紧十字槽头螺丝。
3. Using a phillips screwdriver, remove the screw in the relief valve disc and replace the disc if required, or clean the existing disc.
   用十字形螺丝刀，拆卸安全阀阀瓣内的螺丝，如果需要则进行更换，或者清洗原有的阀瓣。

noun

1. a screw with a special head having crossed slots