在许多情形中，在预定压力下利用坐放在定型座上的落球使坐封机构或启动机构移位。
In many cases a drop ball, which lands in a profiled seat, will be used to shift the setting or activation mechanism at predetermined pressures.
负载反应单元(9)优选地包括流体压力单元，指示器(60)包括在预定压力阈值下操作的机械指示器。
The load reacting unit (9) preferably comprises a fluid pressure unit and the indicator (60) comprises a mechanical indicator that operates at a predetermined pressure threshold.
和在所述一个流量管理阀过渡期间基于所述预定压力监测设备中的一个压力监测设备的输出检测所述一个流量管理阀中的故障。
A fault is detected in the one of the flow management valves based upon the output of one of the pressure monitoring devices during a transition in the flow management valve.
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