Fire valve is used to block HuoZaiOu from smoke and flame through, and in a certain time can satisfy the refractory stability and refractory integrity requirements of the valve. When the building site, in case of a fire, the fire along the ventilation and air conditioning system pipe rapid spread, often can cause a lot of heavy losses. People in order to fire losses caused as a result of reduced to minimum, we must adopt effective fire, smoke measures to control the fire from spreading, and fire valve in ventilation, air conditioning and smoke control system of the reasonable setting has played an important role. However, in many engineering design, selection of the fire valve error, the setting position of unreasonable phenomenon common occurance.

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