阀芯的轴向运动则由两端阀腔的静压力推动。
While the linear motion is actuated by pressure difference of two end spool chamber.
当钻井下沉时，海底立管在顶部附近破裂，另一端还连在防喷阀上。 在随后的倒塌中，它像脆饼一样弯曲。
When the rig sank, the riser broke near the top while remaining attached to the blowout preventer at the bottom, bending itself like a pretzel in its subsequent collapse.
kcb齿轮泵主要有齿轮、轴、泵体、安全阀、轴端密封所组成。
KCB gear pump are mainly gear, shaft, pump body, valve, shaft end seal.
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