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。
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。
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。
In case that corrosive liquid flows in the tubes, stainless solenoid valves should be chosen.
如果管道内流通的是腐蚀性液体，则应选用全不锈钢型的电磁阀；
In case that corrosive liquid flows in the tubes, stainless solenoid valves should be chosen.
如果管道内流通的是腐蚀性液体，则应选用全不锈钢型的电磁阀；
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