But turning this push into a pull required more sophisticated optics -in Grier's case, a solenoid beam.

但是将这种推力转化为一种拉力需要更加复杂的光学，比如，在格里尔的设计中，是通过一种螺线管状光束。

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In this case a proportional solenoid is used to push a poppet against a seat via a spring.

在此比例电磁铁被用来推动一个锥阀芯通过一个弹簧压缩阀座。

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As described earlier, the electrical current to the solenoid of a proportional valve needs to be regulated and not just simply switched on or off as is the case with a conventional valve.

作为简单描述，提供给比例阀电磁铁的电流需要被调节，不象应用常规阀的时仅有开关通或断那样简单。

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