結構緊湊，外表美觀，互換性強，性能穩定、可靠。可應用于有防爆要求的場合。?二位三通的R、P口可互換，使常閉轉化為常開。?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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