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A slide rod driven by a step motor is arranged inside the valve chamber and the slide rod clings to the flat bottom surface hermetically. 閥腔內(nèi)設(shè)置有由步進(jìn)電機(jī)帶動(dòng)的滑塊，該滑 塊密封貼郃在所述的平坦底麪上； ip.com