板上装有密封垫圈，用以密封通道并将流体交替引导到通道中。
There are also sealing washers on the plates, which are used to seal pas-sages and lead fluids into passages alternatively.
以轧辊表面的涡电流引导做为检验方式，以不同的双电线探头交替检测，再轧辊表面上移动位置并随之调整电流导电率。
Eddy current inspection is performed by the inducement of eddy currents on the roll surface by the application of an alternating current from a dual-wire differential probe.
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