定时阀是实现高容积效率的一个主要因素。

Valve timing is a major factor in achieving good volumetric efficiency.

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定时装置随后开启下面的夹管阀并持续一段固定的时间，让塑料粉末从中间罐腔中排出。

The timer then opens the lower valve for a fixed period of time, permitting the - plastic powder to discharge from the intermediate chamber.

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将阀芯、定时线圈按原位装回；再装上软管，打开前端球阀。

The spool, coils regularly replace by in situ; then fitted hose, open the front ball.

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