Screw pump should be in suction stop valve fully open under the condition of starting, in case of overload or empty.
螺杆泵应在吸排停止阀全开的情况下起动，以防过载或吸空。
Compressors are run up with the anti surge valve fully open. This valve is forced to remain open, independently of the control system, until the run-up PROCEDURE has been concluded.
压缩机升速时防喘振阀全开，该阀不受控制系统控制而被强制保持打开直到升速阶段完成。
Ball valve fully open, the flow resistance is very small, almost zero, so the ball valve diameter is widely used in petroleum and natural gas pipelines because the pipeline cleaning easy.
球阀在完全开启时，流阻很小，几乎等于零，因此等径球阀广泛应用于石油天然气管线中，因为容易清扫管线。
Ball valve fully open, the flow resistance is very small, almost zero, so the ball valve diameter is widely used in petroleum and natural gas pipelines because the pipeline cleaning easy.
球阀在完全开启时，流阻很小，几乎等于零，因此等径球阀广泛应用于石油天然气管线中，因为容易清扫管线。
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