Press out the liquid at this time to overcome the pressure out of pipeline systems with all the necessary resistance to the pressure from the pump discharge.
压出，此时液体带有克服压出管道系统所有阻力所必需的压力从泵中排出。
2
Close the door distribution discharge valve and, if cut-off valve is opened, pumping water to the piston from the pipeline until the pump output.
关闭分配阀卸料门，如有截止阀则打开，泵送清水至活塞从输送管输出端泵出为止。
3
The tests show that this changer can automatically control and change the flow direction of gas in the pipeline and suction and discharge state according to gas concentration.