Stroke control mechanism for the regulation and precise control of valve opening and closing position.
行程控制机构，用以调节和准确控制阀门的启闭位置。
The switch block adjusts the position of the flow passage by a spring and a push pressing block, so the switch block has the function of opening and closing the toothpaste passageway.
开关块通过弹簧、推压块调整流道的位置，起到开、闭牙膏通道的作用。
Rolling over a position involves closing the old position and opening a new one.
展期涉及到关闭旧的仓位并开启一个新的仓位。
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