结构紧凑，外表美观，互换性强，性能稳定、可靠。可应用于有防爆要求的场合。 二位三通的R、P口可互换，使常闭转化为常开。 Compact structure,beautiful appearance.strong compatibility,stable and reliable performance. Can be used in occasions with explosion-proof requirements. 3/2 ways R.P mouth and interchangeable, normally closed into the open.
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