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Liquid sulfur sealing is a sulfur recovery device of liquid sulfur system essential safety equipment, the principle of which is the use of liquid column height to effectively seal process gas to avoid gas leaks, polluted operating environment, the operator personal injury. Traditional simple sulfur sealing structure, there could not be in the actual use of liquid sulphur flows, and once blocked, unable to remove and repair problems, also breaking the sulfur gas leaked, liquid sulphur overflow phenomenon.