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Be suitable of one-way opening door with maximum door leaf 800mm wide and maximum bearing weight is 25 35kg.The adjustable section of closing speed is 180° 15°, the adjustable section of locking is 15° 0°. Two hydraulic pressure valves control two sections of door closing separately.Manufacturing door closers of talkback door, fireproofing door according to the customers and factories requirements with high strength aluminum alloy die-casting, the high-qualified aluminum alloy casted body and precisely sealing can avoid oil leakage.Testing times of open and close is over 300,000 times.Standard colors consist of sliver, golden, white, black and bronze, etc.Passed the fire –testing by National Center for Quality Supervision and Testing of Fire Building Materials.Suitable for family, hotel, guesthouse etc.