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ALSD-400 series high-grade explosion-proof top valve controller integrates control, valve position feedback, integral explosion-proof technologies and achieves integral explosion-proof of solenoid valve coil and limit switch box, with explosion-proof grade up to Exd II CT6, greatly reducing the high cost of explosion-proof product and sharpening the competitive edge of the product.Explosion-proof grade: Exd II CT6    Certificate No.: GYB111756