Screw pump should be in suctionstop 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。
2
Pump stop, they would first close the discharge stop valve, and switch to a complete halt until pump suctionstop valve was closed.
泵停车时，应先关闭排出停止阀，并待泵完全停转后关闭吸入停止阀。
3
The suction cup on the back keeps the commuter's head in place, while a message on the front asks fellow passengers, "Could you please wake me up when I reach the stop printed below?"