求翻译：SD自立式安全阀可用于井口采油树、管汇、场站管线上，它集闸阀、执行器、导阀、快速止回阀和截止阀于一体。当管道压力出现异常时，自动截断管道的阀门，又称故障关断阀，其作用是保护阀下游的管道和设备，防止管线破裂、堵塞造成事故扩大。SD自立式安全阀驱动压力采用的管道压力，无需其它动力源，对辅助设备依赖性低。是什么意思？

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SD from vertical safety valve available in well head production tree, pipe manifold, on airfield pipeline, its collection gate valve, actuator, pilot valve, fast check valve and cut-off valve in a body.When the pipeline pressure appears exceptionally, interrupts the pipeline automatically the valve,

SD self-standing relief valves available for wellhead trees, manifolds, stations on the pipeline, it sets valve, actuators, valves, check valves and globe valves in one fast. When an exception occurs when the line pressure, automatic truncation of pipeline valves, also known as fault shut off valve,

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