喷枪在垂直面自动移动的装置，一个回动的或往复式的提供移动的装置。
Device used to move automatic guns in a vertical plane. A reversing or reciprocating drive system provides motion.
其它往复式压缩机的防护装置应符合API 618或生产厂家标准，两者取一适用者。
Protective devices for other reciprocating compressor shall be in accordance with API 618 or manufacture's standard, whichever applicable.
小型乙烯生产装置的往复式甲烷制冷压缩机出口气体中存在黑色粉尘，易进入冷箱造成堵塞，影响甲烷制冷并危及装置生产。
The black powder in the exit gas of methane compressor caused the plugging of coo ling box and resulted in the reduction of refrigeration effect.
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