single-line subsurface safety valve 单线控制井下安全阀
And single screw pump in the pump itself cannot set the relief valve, can only be set up in line, increase the investment of equipment cost and installation cost.
而单螺杆泵在泵本身不能设置安全阀，只能在管路中设置，提高了设备投入成本和安装成本。
The ALC? is an in-line, spring assisted, single guided "wafer" check valve designed to prevent "water hammer" and "reverse" flow.
同轴、管内螺纹弹簧单导对夹式止回阀，专门用于防止水击作用和倒流现象。
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