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。
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.
因为首次选型和安装存在一定缺陷，导致火炬气回收装置1号螺杆压缩机严重失效。
The No. 1 screw compressor in flare gas recovery has failed due to inexperience in equipment selection and defects in installation.
使用安装在冻干机内的液压装置或螺杆全加塞。
Complete stoppering of the vials usually by hydraulic or screw rod stoppering mechanisms installed in the lyophilizers.
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